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2021-06-11dt-bindings: interrupt-controller: arm,gic-v3: Describe GICv3 optional propertiesLad Prabhakar1-0/+13
Describe the optional GICv3 properties: - clocks - clock-names - power-domains - resets Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210609155108.16590-1-prabhakar.mahadev-lad.rj@bp.renesas.com
2021-06-11irqchip: gic-pm: Remove redundant error log of clock bulkChunfeng Yun1-3/+1
There is error log in clk_bulk_prepare/enable() Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/1617937474-24630-1-git-send-email-chunfeng.yun@mediatek.com
2021-06-11irqchip/sun4i: Remove unnecessary oom messageZhen Lei1-6/+2
Fixes scripts/checkpatch.pl warning: WARNING: Possible unnecessary 'out of memory' message Remove it can help us save a bit of memory. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210609141428.14737-1-thunder.leizhen@huawei.com
2021-06-11irqchip/irq-imx-gpcv2: Remove unnecessary oom messageZhen Lei1-3/+1
Fixes scripts/checkpatch.pl warning: WARNING: Possible unnecessary 'out of memory' message Remove it can help us save a bit of memory. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210609141150.14637-1-thunder.leizhen@huawei.com
2021-06-11irqchip/imgpdc: Remove unnecessary oom messageZhen Lei1-6/+2
Fixes scripts/checkpatch.pl warning: WARNING: Possible unnecessary 'out of memory' message Remove it can help us save a bit of memory. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210609140828.14584-1-thunder.leizhen@huawei.com
2021-06-11irqchip/gic-v3-its: Remove unnecessary oom messageZhen Lei1-6/+2
Fixes scripts/checkpatch.pl warning: WARNING: Possible unnecessary 'out of memory' message Remove it can help us save a bit of memory. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210609140643.14531-1-thunder.leizhen@huawei.com
2021-06-11irqchip/gic-v2m: Remove unnecessary oom messageZhen Lei1-3/+1
Fixes scripts/checkpatch.pl warning: WARNING: Possible unnecessary 'out of memory' message Remove it can help us save a bit of memory. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210609140534.14478-1-thunder.leizhen@huawei.com
2021-06-11irqchip/exynos-combiner: Remove unnecessary oom messageZhen Lei1-3/+1
Fixes scripts/checkpatch.pl warning: WARNING: Possible unnecessary 'out of memory' message Remove it can help us save a bit of memory. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210609140335.14425-1-thunder.leizhen@huawei.com
2021-06-10irqchip: Bulk conversion to generic_handle_domain_irq()Marc Zyngier47-190/+111
Wherever possible, replace constructs that match either generic_handle_irq(irq_find_mapping()) or generic_handle_irq(irq_linear_revmap()) to a single call to generic_handle_domain_irq(). Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10genirq: Move non-irqdomain handle_domain_irq() handling into ARM's handle_IRQ()Marc Zyngier3-33/+33
Despite the name, handle_domain_irq() deals with non-irqdomain handling for the sake of a handful of legacy ARM platforms. Move such handling into ARM's handle_IRQ(), allowing for better code generation for everyone else. This allows us get rid of some complexity, and to rearrange the guards on the various helpers in a more logical way. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10genirq: Add generic_handle_domain_irq() helperMarc Zyngier2-1/+20
Provide generic_handle_domain_irq() as a pendent to handle_domain_irq() for non-root interrupt controllers Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqchip/nvic: Convert from handle_IRQ() to handle_domain_irq()Marc Zyngier1-3/+1
Given that the nvic driver is fully irqdomain aware, there is no reason for it to use the arch-specific handle_IRQ(), and it can be moved over to handle_domain_irq(). Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqdesc: Fix __handle_domain_irq() commentMarc Zyngier1-2/+1
It appears that the comment about a NULL domain meaning anything has always been wrong. Fix it. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10genirq: Use irq_resolve_mapping() to implement __handle_domain_irq() and coMarc Zyngier2-25/+36
In order to start reaping the benefits of irq_resolve_mapping(), start using it in __handle_domain_irq() and handle_domain_nmi(). This involves splitting generic_handle_irq() to be able to directly provide the irq_desc. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqdomain: Introduce irq_resolve_mapping()Marc Zyngier2-10/+41
Rework irq_find_mapping() to return an both an irq_desc pointer, optionally the virtual irq number, and rename the result to __irq_resolve_mapping(). a new helper called irq_resolve_mapping() is provided for code that doesn't need the virtual irq number. irq_find_mapping() is also rewritten in terms of __irq_resolve_mapping(). Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqdomain: Protect the linear revmap with RCUMarc Zyngier2-28/+26
It is pretty odd that the radix tree uses RCU while the linear portion doesn't, leading to potential surprises for the users, depending on how the irqdomain has been created. Fix this by moving the update of the linear revmap under the mutex, and the lookup under the RCU read-side lock. The mutex name is updated to reflect that it doesn't only cover the radix-tree anymore. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqdomain: Cache irq_data instead of a virq number in the revmapMarc Zyngier2-7/+13
Caching a virq number in the revmap is pretty inefficient, as it means we will need to convert it back to either an irq_data or irq_desc to do anything with it. It is also a bit odd, as the radix tree does cache irq_data pointers. Change the revmap type to be an irq_data pointer instead of an unsigned int, and preserve the current API for now. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqdomain: Use struct_size() helper when allocating irqdomainMarc Zyngier1-1/+1
Instead of open-coding the size computation of struct irqdomain, use the struct_size() helper instead. This is going to be handy as we change the type of the revmap array. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqdomain: Make normal and nomap irqdomains exclusiveMarc Zyngier2-13/+38
Direct mappings are completely exclusive of normal mappings, meaning that we can refactor the code slightly so that we can get rid of the revmap_direct_max_irq field and use the revmap_size field instead, reducing the size of the irqdomain structure. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10powerpc: Move the use of irq_domain_add_nomap() behind a config optionMarc Zyngier7-2/+17
Only a handful of old PPC systems are still using the old 'nomap' variant of the irqdomain library. Move the associated definitions behind a configuration option, which will allow us to make some more radical changes. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqdomain: Reimplement irq_linear_revmap() with irq_find_mapping()Marc Zyngier2-16/+12
irq_linear_revmap() is supposed to be a fast path for domain lookups, but it only exposes low-level details of the irqdomain implementation, details which are better kept private. The *overhead* between the two is only a function call and a couple of tests, so it is likely that noone can show any meaningful difference compared to the cost of taking an interrupt. Reimplement irq_linear_revmap() with irq_find_mapping() in order to preserve source code compatibility, and rename the internal field for a measure. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqdomain: Kill irq_domain_add_legacy_isaMarc Zyngier2-12/+0
This helper doesn't have a user anymore, let's remove it. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10powerpc: Drop dependency between asm/irq.h and linux/irqdomain.hMarc Zyngier1-1/+0
Directly including linux/irqdomain.h was hiding all sort of sins, which have now been fixed. Drop the spurious include. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10powerpc: Convert irq_domain_add_legacy_isa use to irq_domain_add_legacyMarc Zyngier6-8/+10
irq_domain_add_legacy_isa is a pain. It only exists for the benefit of two PPC-specific drivers, and creates an ugly dependency between asm/irq.h and linux/irqdomain.h Instead, let's convert these two drivers to irq_domain_add_legacy(), stop using NUM_ISA_INTERRUPTS by directly setting NR_IRQS_LEGACY. The dependency cannot be broken yet as there is a lot of PPC-related code that depends on it, but that's the first step towards it. A followup patch will remove irq_domain_add_legacy_isa. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10scsi/ibmvscsi: Directly include linux/{of.h,irqdomain.h}Marc Zyngier2-0/+2
A couple of ibmvscsi files are missing the inclusion of linux/of.h and linux/irqdomain.h, relying on transitive inclusion from another file. As we are about to break this dependency, make sure these dependencies are explicit. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10powerpc: Add missing linux/{of.h,irqdomain.h} include directivesMarc Zyngier13-0/+13
A bunch of PPC files are missing the inclusion of linux/of.h and linux/irqdomain.h, relying on transitive inclusion from another file. As we are about to break this dependency, make sure these dependencies are explicit. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10MIPS: Do not include linux/irqdomain.h from asm/irq.hMarc Zyngier1-1/+0
Including linux/irqdomain.h from asm/irq.h is going to break as soon as linux/irqdomain.h will include linux/irq.h, so let's fix this. Code relying on linux/irqomain.h should include it directly. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10MIPS: Add missing linux/irqdomain.h includesMarc Zyngier4-0/+4
A number of MIPS platforms are failing to directly include irqdomain.h. Fix this so that we can drop unnecessary dependencies Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10MIPS: lantiq: Directly include linux/of.h in xway/dma.cMarc Zyngier1-0/+1
This drivers currently obtains linux/of.h by luck and a chain of bizarre inclusions, which we're about to fix. Let's include the required file directly. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10irqchip/mips-gic: Directly include linux/irqdomain.hMarc Zyngier1-0/+1
This drivers currently obtains linux/irqdomain.h by luck and a chain of bizarre inclusions, which we're about to fix. Let's include the required file directly. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10watchdog/octeon-wdt: Directly include linux/irqdomain.hMarc Zyngier1-0/+1
This drivers currently obtains linux/irqdomain.h by luck and a chain of bizarre inclusions, which we're about to fix. Let's include the required file directly. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10mfd: ioc3: Directly include linux/irqdomain.hMarc Zyngier1-0/+1
This driver include linux/irqdomain.h via a bizarre set of indirection, which we are about to break. Directly include the required file. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10staging: octeon-hcd: Directly include linux/of.hMarc Zyngier1-0/+2
This drivers currently obtains linux/of.h by luck and a chain of bizarre inclusions, which we're about to fix. Let's include the required file directly. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-10nios2: Do not include linux/irqdomain.h from asm/irq.hMarc Zyngier2-1/+1
Including linux/irqdomain.h from asm/irq.h is going to break as soon as linux/irqdomain.h will include linux/irq.h, so let's fix this. Code relying on linux/irqomain.h should include it directly. Signed-off-by: Marc Zyngier <maz@kernel.org>
2021-06-06irqchip/mbigen: Fix compile warning when CONFIG_ACPI is disabledYang Yingliang1-6/+6
Fix the following compile warning: drivers/irqchip/irq-mbigen.c:372:36: warning: ‘mbigen_acpi_match’ defined but not used [-Wunused-const-variable=] static const struct acpi_device_id mbigen_acpi_match[] = { Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210519050455.1693953-1-yangyingliang@huawei.com
2021-06-06irqchip/qcom-pdc: Switch to IRQCHIP_PLATFORM_DRIVER and allow as a moduleSaravana Kannan2-2/+8
This patch revives changes from Saravana Kannan to switch the qcom-pdc driver to use IRQCHIP_PLATFORM_DRIVER helper macros, and allows qcom-pdc driver to be loaded as a permanent module. Earlier attempts at this ran into trouble with loading dependencies, but with Saravana's fw_devlink=on set by default now we should avoid those. [jstultz: Folded in with my changes to allow the driver to be loadable as a permenent module] Cc: Andy Gross <agross@kernel.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Joerg Roedel <joro@8bytes.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Marc Zyngier <maz@kernel.org> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Maulik Shah <mkshah@codeaurora.org> Cc: Lina Iyer <ilina@codeaurora.org> Cc: Saravana Kannan <saravanak@google.com> Cc: Todd Kjos <tkjos@google.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: linux-arm-msm@vger.kernel.org Cc: iommu@lists.linux-foundation.org Cc: linux-gpio@vger.kernel.org Signed-off-by: Saravana Kannan <saravanak@google.com> Signed-off-by: John Stultz <john.stultz@linaro.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210518211922.3474368-1-john.stultz@linaro.org
2021-06-06dt-bindings: irqchip: renesas-irqc: Add R-Car M3-W+ supportGeert Uytterhoeven1-0/+1
Document support for the Interrupt Controller for External Devices (INT-EC) in the Renesas R-Car M3-W+ (r8a77961) SoC. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/55d2c30cb14b2e10193a7fd4aa7670c70f360037.1622546880.git.geert+renesas@glider.be
2021-05-30Linux 5.13-rc4Linus Torvalds1-1/+1
2021-05-29seccomp: Refactor notification handler to prepare for new semanticsSargun Dhillon1-14/+16
This refactors the user notification code to have a do / while loop around the completion condition. This has a small change in semantic, in that previously we ignored addfd calls upon wakeup if the notification had been responded to, but instead with the new change we check for an outstanding addfd calls prior to returning to userspace. Rodrigo Campos also identified a bug that can result in addfd causing an early return, when the supervisor didn't actually handle the syscall [1]. [1]: https://lore.kernel.org/lkml/20210413160151.3301-1-rodrigo@kinvolk.io/ Fixes: 7cf97b125455 ("seccomp: Introduce addfd ioctl to seccomp user notifier") Signed-off-by: Sargun Dhillon <sargun@sargun.me> Acked-by: Tycho Andersen <tycho@tycho.pizza> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Kees Cook <keescook@chromium.org> Tested-by: Rodrigo Campos <rodrigo@kinvolk.io> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210517193908.3113-3-sargun@sargun.me
2021-05-29selftests: kvm: fix overlapping addresses in memslot_perf_testPaolo Bonzini1-1/+1
vm_create allocates memory and maps it close to GPA. This memory is separate from what is allocated in subsequent calls to vm_userspace_mem_region_add, so it is incorrect to pass the test memory size to vm_create_default. Just pass a small fixed amount of memory which can be used later for page table, otherwise GPAs are already allocated at MEM_GPA and the test aborts. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-05-28KVM: X86: Kill off ctxt->udWanpeng Li3-7/+5
ctxt->ud is consumed only by x86_decode_insn(), we can kill it off by passing emulation_type to x86_decode_insn() and dropping ctxt->ud altogether. Tracking that info in ctxt for literally one call is silly. Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Reviewed-by: Sean Christopherson <seanjc@google.com> Message-Id: <1622160097-37633-2-git-send-email-wanpengli@tencent.com>
2021-05-28KVM: X86: Fix warning caused by stale emulation contextWanpeng Li1-5/+5
Reported by syzkaller: WARNING: CPU: 7 PID: 10526 at linux/arch/x86/kvm//x86.c:7621 x86_emulate_instruction+0x41b/0x510 [kvm] RIP: 0010:x86_emulate_instruction+0x41b/0x510 [kvm] Call Trace: kvm_mmu_page_fault+0x126/0x8f0 [kvm] vmx_handle_exit+0x11e/0x680 [kvm_intel] vcpu_enter_guest+0xd95/0x1b40 [kvm] kvm_arch_vcpu_ioctl_run+0x377/0x6a0 [kvm] kvm_vcpu_ioctl+0x389/0x630 [kvm] __x64_sys_ioctl+0x8e/0xd0 do_syscall_64+0x3c/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae Commit 4a1e10d5b5d8 ("KVM: x86: handle hardware breakpoints during emulation()) adds hardware breakpoints check before emulation the instruction and parts of emulation context initialization, actually we don't have the EMULTYPE_NO_DECODE flag here and the emulation context will not be reused. Commit c8848cee74ff ("KVM: x86: set ctxt->have_exception in x86_decode_insn()) triggers the warning because it catches the stale emulation context has #UD, however, it is not during instruction decoding which should result in EMULATION_FAILED. This patch fixes it by moving the second part emulation context initialization into init_emulate_ctxt() and before hardware breakpoints check. The ctxt->ud will be dropped by a follow-up patch. syzkaller source: https://syzkaller.appspot.com/x/repro.c?x=134683fdd00000 Reported-by: syzbot+71271244f206d17f6441@syzkaller.appspotmail.com Fixes: 4a1e10d5b5d8 (KVM: x86: handle hardware breakpoints during emulation) Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Reviewed-by: Sean Christopherson <seanjc@google.com> Message-Id: <1622160097-37633-1-git-send-email-wanpengli@tencent.com>
2021-05-28KVM: X86: Use kvm_get_linear_rip() in single-step and #DB/#BP interceptionYuan Yao2-5/+3
The kvm_get_linear_rip() handles x86/long mode cases well and has better readability, __kvm_set_rflags() also use the paired function kvm_is_linear_rip() to check the vcpu->arch.singlestep_rip set in kvm_arch_vcpu_ioctl_set_guest_debug(), so change the "CS.BASE + RIP" code in kvm_arch_vcpu_ioctl_set_guest_debug() and handle_exception_nmi() to this one. Signed-off-by: Yuan Yao <yuan.yao@intel.com> Message-Id: <20210526063828.1173-1-yuan.yao@linux.intel.com> Reviewed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-05-28Documentation: seccomp: Fix user notification documentationSargun Dhillon1-8/+8
The documentation had some previously incorrect information about how userspace notifications (and responses) were handled due to a change from a previously proposed patchset. Signed-off-by: Sargun Dhillon <sargun@sargun.me> Acked-by: Tycho Andersen <tycho@tycho.pizza> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Kees Cook <keescook@chromium.org> Fixes: 6a21cc50f0c7 ("seccomp: add a return code to trap to userspace") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210517193908.3113-2-sargun@sargun.me
2021-05-28MAINTAINERS: adjust to removing i2c designware platform dataLukas Bulwahn1-1/+0
Commit 5a517b5bf687 ("i2c: designware: Get rid of legacy platform data") removes ./include/linux/platform_data/i2c-designware.h, but misses to adjust the SYNOPSYS DESIGNWARE I2C DRIVER section in MAINTAINERS. Hence, ./scripts/get_maintainer.pl --self-test=patterns complains: warning: no file matches F: include/linux/platform_data/i2c-designware.h Remove the file entry to this removed file as well. Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-05-28perf vendor events powerpc: Fix eventcode of power10 JSON eventsKajol Jain10-299/+299
Fixed the eventcode values in the power10 JSON event files to prepend "0x" since these are hexadecimal values. The patch also changes the event description of the PM_EXEC_STALL_LOAD_FINISH and PM_EXEC_STALL_NTC_FLUSH event and move some events to correct files. Fixes: 32daa5d7899e ("perf vendor events: Initial JSON/events list for power10 platform") Signed-off-by: Kajol Jain <kjain@linux.ibm.com> Reviewed-by: Paul A. Clarke <pc@us.ibm.com> Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com> Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lore.kernel.org/lkml/20210525063723.1191514-1-kjain@linux.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-05-28Revert "serial: 8250: 8250_omap: Fix possible interrupt storm"Greg Kroah-Hartman1-12/+0
This reverts commit 31fae7c8b18c3f8029a2a5dce97a3182c1a167a0. Tony writes: I just noticed this causes the following regression in Linux next when pressing a key on uart console after boot at least on omap3. This seems to happen on serial_port_in(port, UART_RX) in the quirk handling. So let's drop this. Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/YLCCJzkkB4N7LTQS@atomide.com Fixes: 31fae7c8b18c ("serial: 8250: 8250_omap: Fix possible interrupt storm") Reported-by: Tony Lindgren <tony@atomide.com> Cc: Jan Kiszka <jan.kiszka@siemens.com> Cc: Vignesh Raghavendra <vigneshr@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-28i2c: s3c2410: fix possible NULL pointer deref on read message after writeKrzysztof Kozlowski1-0/+3
Interrupt handler processes multiple message write requests one after another, till the driver message queue is drained. However if driver encounters a read message without preceding START, it stops the I2C transfer as it is an invalid condition for the controller. At least the comment describes a requirement "the controller forces us to send a new START when we change direction". This stop results in clearing the message queue (i2c->msg = NULL). The code however immediately jumped back to label "retry_write" which dereferenced the "i2c->msg" making it a possible NULL pointer dereference. The Coverity analysis: 1. Condition !is_msgend(i2c), taking false branch. if (!is_msgend(i2c)) { 2. Condition !is_lastmsg(i2c), taking true branch. } else if (!is_lastmsg(i2c)) { 3. Condition i2c->msg->flags & 1, taking true branch. if (i2c->msg->flags & I2C_M_RD) { 4. write_zero_model: Passing i2c to s3c24xx_i2c_stop, which sets i2c->msg to NULL. s3c24xx_i2c_stop(i2c, -EINVAL); 5. Jumping to label retry_write. goto retry_write; 6. var_deref_model: Passing i2c to is_msgend, which dereferences null i2c->msg. if (!is_msgend(i2c)) {" All previous calls to s3c24xx_i2c_stop() in this interrupt service routine are followed by jumping to end of function (acknowledging the interrupt and returning). This seems a reasonable choice also here since message buffer was entirely emptied. Addresses-Coverity: Explicit null dereferenced Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-05-28i2c: mediatek: Disable i2c start_en and clear intr_stat brfore resetQii Wang1-0/+5
The i2c controller driver do dma reset after transfer timeout, but sometimes dma reset will trigger an unexpected DMA_ERR irq. It will cause the i2c controller to continuously send interrupts to the system and cause soft lock-up. So we need to disable i2c start_en and clear intr_stat to stop i2c controller before dma reset when transfer timeout. Fixes: aafced673c06("i2c: mediatek: move dma reset before i2c reset") Signed-off-by: Qii Wang <qii.wang@mediatek.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-05-27perf stat: Fix error check for bpf_program__attachNamhyung Kim1-2/+2
It seems the bpf_program__attach() returns a negative error code instead of a NULL pointer in case of error. Fixes: 7fac83aaf2ee ("perf stat: Introduce 'bperf' to share hardware PMCs with BPF") Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <songliubraving@fb.com> Link: http://lore.kernel.org/lkml/20210527220052.1657578-1-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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