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2021-01-22i2c: qup: advertise SMBus transfers using RECV_LENWolfram Sang1-1/+1
This driver implements I2C_M_RECV_LEN, so it can advertise the SMBus transfers needing it. This also enables client devices to check for the RECV_LEN capability. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-22i2c: algo: bit: use new macro to specifiy capabilitiesWolfram Sang1-3/+1
Let's use the new macro for emulating SMBus with RECV_LEN support. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-22i2c: uapi: add macro to describe support for all SMBus transfersWolfram Sang1-0/+5
Some I2C bus master drivers which support I2C_M_RECV_LEN do not set the functionality bits of the now supported SMBus transfers. Add a convenience macro to make this very simple. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-22i2c: remove licence boilerplate from i2c-dev UAPI headerWolfram Sang1-20/+5
Remove boilerplate because we now have the SPDX header. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-22i2c: remove licence boilerplate from main UAPI headerWolfram Sang1-25/+7
Remove boilerplate because we now have the SPDX header. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-22i2c: refactor documentation of struct i2c_msgWolfram Sang1-36/+55
The information about 'i2c_msg' was spread between kdoc and comments. Move all the explanations to kdoc and duplicate only the requirements for the flags in the comments. Also, add some redundancy and fix some typos while here. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-22i2c: remove u300 bus driverArnd Bergmann4-1037/+0
The ST-Ericsson U300 platform is getting removed, so this driver is no longer needed. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-22i2c: remove sirf bus driverArnd Bergmann4-505/+0
The CSR SiRF prima2/atlas platforms are getting removed, so this driver is no longer needed. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Barry Song <baohua@kernel.org> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-17i2c: stub: remove definition of DEBUGTom Rix1-1/+0
Defining DEBUG should only be done in development. So remove DEBUG. Signed-off-by: Tom Rix <trix@redhat.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-17i2c: i2c-mux-gpio: Enable this driver in ACPI landEvan Green1-28/+79
Enable i2c-mux-gpio devices to be defined via ACPI. The idle-state property translates directly to a fwnode_property_*() call. The child reg property translates naturally into _ADR in ACPI. The i2c-parent binding is a relic from the days when the bindings dictated that all direct children of an I2C controller had to be I2C devices. These days that's no longer required. The i2c-mux can sit as a direct child of its parent controller, which is where it makes the most sense from a hardware description perspective. For the ACPI implementation we'll assume that's always how the i2c-mux-gpio is instantiated. Signed-off-by: Evan Green <evgreen@chromium.org> Acked-by: Peter Rosin <peda@axentia.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-17i2c: i2c-mux-gpio: Factor out pdev->dev in _probe_dt()Evan Green1-2/+3
Factor out &pdev->dev into a local variable in preparation for the ACPI enablement of this function, which will utilize the variable more. Signed-off-by: Evan Green <evgreen@chromium.org> Acked-by: Peter Rosin <peda@axentia.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-17dt-bindings: i2c: renesas,i2c: add r8a779a0 (V3U) supportWolfram Sang1-0/+1
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-17i2c: Drop unused efm32 bus driverUwe Kleine-König3-477/+0
Support for this machine was just removed, so drop the now unused i2c bus driver, too. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-11i2c: smbus: switch from loops to memcpyDmitry Torokhov1-10/+5
When copying memory from one buffer to another, instead of open-coding loops with byte-by-byte copies let's use memcpy() which might be a bit faster and makes intent more clear. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-06i2c: mlxcpld: Add support for I2C bus frequency settingVadim Pasternak1-1/+62
Add support for I2C bus frequency setting according to the specific system capability. This capability is obtained from CPLD frequency setting register, which could be provided through the platform data. If such register is provided, it specifies minimal I2C bus frequency to be used for the devices attached to the I2C bus. Supported freqeuncies are 100KHz, 400KHz, 1MHz, while 100KHz is the default. Signed-off-by: Vadim Pasternak <vadimp@nvidia.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: busses: Use DEFINE_SPINLOCK() for spinlockZheng Yongjun1-2/+1
spinlock can be initialized automatically with DEFINE_SPINLOCK() rather than explicitly calling spin_lock_init(). Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: use DIV_ROUND_UP macro to do calculationZheng Yongjun1-3/+3
Don't open-code DIV_ROUND_UP() kernel macro. Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com> Reviewed-by: Fabio Estevam <festevam@gmail.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: fix platform_get_irq.cocci warningsTian Tao1-3/+1
Remove dev_err() messages after platform_get_irq*() failures. drivers/i2c/busses/i2c-hix5hd2.c:417:2-9: line 417 is redundant because platform_get_irq() already prints an error Signed-off-by: Tian Tao <tiantao6@hisilicon.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: gpio: fix MODULE_LICENCEWolfram Sang1-1/+1
Let MODULE_LICENCE match the SPDX header which is correctly based on the previous textual description. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: iproc: handle rx fifo full interruptRayagonda Kokatanur1-4/+17
Add code to handle IS_S_RX_FIFO_FULL_SHIFT interrupt to support master write request with >= 64 bytes. Iproc has a slave rx fifo size of 64 bytes. Rx fifo full interrupt (IS_S_RX_FIFO_FULL_SHIFT) will be generated when RX fifo becomes full. This can happen if master issues write request of more than 64 bytes. Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Acked-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: iproc: handle master read requestRayagonda Kokatanur1-45/+170
Handle single or multi byte master read request with or without repeated start. Fixes: c245d94ed106 ("i2c: iproc: Add multi byte read-write support for slave mode") Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Acked-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: iproc: fix typo in slave_isr functionRayagonda Kokatanur1-1/+1
Fix typo in bcm_iproc_i2c_slave_isr(). Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Acked-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: iproc: update slave isr mask (ISR_MASK_SLAVE)Rayagonda Kokatanur1-1/+2
Update slave isr mask (ISR_MASK_SLAVE) to include remaining two slave interrupts. Fixes: c245d94ed106 ("i2c: iproc: Add multi byte read-write support for slave mode") Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Acked-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: iproc: handle only slave interrupts which are enabledRayagonda Kokatanur1-4/+9
Handle only slave interrupts which are enabled. The IS_OFFSET register contains the interrupt status bits which will be set regardless of the enabling of the corresponding interrupt condition. One must therefore look at both IS_OFFSET and IE_OFFSET to determine whether an interrupt condition is set and enabled. Fixes: c245d94ed106 ("i2c: iproc: Add multi byte read-write support for slave mode") Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Acked-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: iproc: handle Master aborted errorRayagonda Kokatanur1-3/+5
Handle Master aborted error by flushing tx and rx fifo and reinitializing the hw. Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com> Acked-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: rcar: protect against supurious interrupts on V3UWolfram Sang1-14/+43
V3U creates spurious interrupts which we need to handle. This costs time until BUS_PHASE_DATA can be activated which is problematic for Gen2 SoCs and earlier. Because of this we introduce two interrupt handlers here which will call a generic main irq function once the timing critical stuff is done. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: rcar: make sure irq is not threaded on Gen2 and earlierWolfram Sang1-1/+5
Ensure this irq runs as fast as possible. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: rcar: optimize cacheline to minimize HW race conditionWolfram Sang1-1/+1
'flags' and 'io' are needed first, so they should be at the beginning of the private struct. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: rcar: faster irq code to minimize HW race conditionWolfram Sang1-7/+4
To avoid the HW race condition on R-Car Gen2 and earlier, we need to write to ICMCR as soon as possible in the interrupt handler. We can improve this by writing a static value instead of masking out bits. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: qcom-geni: Store DMA mapping data in geni_i2c_dev structRoja Rani Yarubandi1-16/+43
Store DMA mapping data in geni_i2c_dev struct to enhance DMA mapping data scope. For example during shutdown callback to unmap DMA mapping, this stored DMA mapping data can be used to call geni_se_tx_dma_unprep and geni_se_rx_dma_unprep functions. Add two helper functions geni_i2c_rx_msg_cleanup and geni_i2c_tx_msg_cleanup to unwrap the things after rx/tx FIFO/DMA transfers, so that the same can be used in geni_i2c_stop_xfer() function during shutdown callback. Signed-off-by: Roja Rani Yarubandi <rojay@codeaurora.org> Reviewed-by: Akash Asthana <akashast@codeaurora.org> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: i801: Refactor mux code since platform_device_unregister() is NULL awareAndy Shevchenko1-7/+3
platform_device_unregister() is NULL-aware and thus doesn't required a duplication check in i801_del_mux(). Besides that it's also error pointer aware, and we may drop unneeded assignment in i801_add_mux() followed by conversion to PTR_ERR_OR_ZERO() for the returned value. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: i801: Drop duplicate NULL check in i801_del_mux()Andy Shevchenko1-2/+1
Since gpiod_remove_lookup_table() is NULL-aware, no need to have this check in the caller. Drop duplicate NULL check. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05gpiolib: Follow usual pattern for gpiod_remove_lookup_table() callAndy Shevchenko1-0/+4
The usual pattern for the remove calls, like gpiod_remove_lookup_table(), is to be NULL-aware, i.o.w. become a no-op whenever parameter is NULL. Update gpiod_remove_lookup_table() call to follow this pattern. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: mlxcpld: Decrease polling time for performance improvementVadim Pasternak1-1/+1
Decrease polling time 'MLXCPLD_I2C_POLL_TIME' from 2000 usec to 400 usec. It greatly improves performance of I2C transactions. Reliability of setting polling time to 400 usec has been thoroughly validated across all the supported systems. Signed-off-by: Vadim Pasternak <vadimp@nvidia.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: mlxcpld: Update module licenseVadim Pasternak1-29/+3
Update license to SPDX-License. Signed-off-by: Vadim Pasternak <vadimp@nvidia.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-05i2c: core: Do not print duplicate error when failing to register an i2c-client from ACPIHans de Goede1-5/+1
i2c_new_client_device() already prints an error when it fails. Some ACPI tables contain 2 ACPI devices describing the same i2c-client, leading to errors like this: [ 1.620847] i2c i2c-4: Failed to register i2c client MAGN0001:00 at 0x1d (-16) [ 1.620870] i2c i2c-4: failed to add I2C device MAGN0001:00 from ACPI There is nothing we can do about the first -EBUSY error being logged, but the second error does not really add any new information, so lets drop it. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
2021-01-03Linux 5.11-rc2Linus Torvalds1-1/+1
2021-01-01depmod: handle the case of /sbin/depmod without /sbin in PATHLinus Torvalds1-0/+2
Commit 436e980e2ed5 ("kbuild: don't hardcode depmod path") stopped hard-coding the path of depmod, but in the process caused trouble for distributions that had that /sbin location, but didn't have it in the PATH (generally because /sbin is limited to the super-user path). Work around it for now by just adding /sbin to the end of PATH in the depmod.sh script. Reported-and-tested-by: Sedat Dilek <sedat.dilek@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-12-30kernel/io_uring: cancel io_uring before task worksPavel Begunkov2-2/+2
For cancelling io_uring requests it needs either to be able to run currently enqueued task_works or having it shut down by that moment. Otherwise io_uring_cancel_files() may be waiting for requests that won't ever complete. Go with the first way and do cancellations before setting PF_EXITING and so before putting the task_work infrastructure into a transition state where task_work_run() would better not be called. Cc: stable@vger.kernel.org # 5.5+ Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-30io_uring: fix io_sqe_files_unregister() hangsPavel Begunkov1-2/+22
io_sqe_files_unregister() uninterruptibly waits for enqueued ref nodes, however requests keeping them may never complete, e.g. because of some userspace dependency. Make sure it's interruptible otherwise it would hang forever. Cc: stable@vger.kernel.org # 5.6+ Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-30io_uring: add a helper for setting a ref nodePavel Begunkov1-10/+12
Setting a new reference node to a file data is not trivial, don't repeat it, add and use a helper. Cc: stable@vger.kernel.org # 5.6+ Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-30intel_idle: add SnowRidge C-state tableArtem Bityutskiy1-1/+40
Add C-state table for the SnowRidge SoC which is found on Intel Jacobsville platforms. The following has been changed. 1. C1E latency changed from 10us to 15us. It was measured using the open source "wult" tool (the "nic" method, 15us is the 99.99th percentile). 2. C1E power break even changed from 20us to 25us, which may result in less C1E residency in some workloads. 3. C6 latency changed from 50us to 130us. Measured the same way as C1E. The C6 C-state is supported only by some SnowRidge revisions, so add a C-state table commentary about this. On SnowRidge, C6 support is enumerated via the usual mechanism: "mwait" leaf of the "cpuid" instruction. The 'intel_idle' driver does check this leaf, so even though C6 is present in the table, the driver will only use it if the CPU does support it. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-30cpufreq: intel_pstate: Fix fast-switch fallback pathRafael J. Wysocki1-1/+0
When sugov_update_single_perf() falls back to the "frequency" path due to the missing scale-invariance, it will call cpufreq_driver_fast_switch() via sugov_fast_switch() and the driver's ->fast_switch() callback will be invoked, so it must not be NULL. However, after commit a365ab6b9dfb ("cpufreq: intel_pstate: Implement the ->adjust_perf() callback") intel_pstate sets ->fast_switch() to NULL when it is going to use intel_cpufreq_adjust_perf(), which is a mistake, because on x86 the scale-invariance may be turned off dynamically, so modify it to retain the original ->adjust_perf() callback pointer. Fixes: a365ab6b9dfb ("cpufreq: intel_pstate: Implement the ->adjust_perf() callback") Reported-by: Kenneth R. Crudup <kenny@panix.com> Tested-by: Kenneth R. Crudup <kenny@panix.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-30s390/Kconfig: sort config S390 select list once againHeiko Carstens1-14/+17
...and add comments at the top and bottom. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2020-12-30s390: update defconfigsHeiko Carstens3-7/+18
Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
2020-12-29block: add debugfs stanza for QUEUE_FLAG_NOWAITAndres Freund1-0/+1
This was missed in 021a24460dc2. Leads to the numeric value of QUEUE_FLAG_NOWAIT (i.e. 29) showing up in /sys/kernel/debug/block/*/state. Fixes: 021a24460dc28e7412aecfae89f60e1847e685c0 Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Mike Snitzer <snitzer@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andres Freund <andres@anarazel.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-29fs: block_dev.c: fix kernel-doc warnings from struct block_device changesRandy Dunlap1-1/+1
Fix new kernel-doc warnings in fs/block_dev.c: ../fs/block_dev.c:1066: warning: Excess function parameter 'whole' description in 'bd_abort_claiming' ../fs/block_dev.c:1837: warning: Function parameter or member 'dev' not described in 'lookup_bdev' Fixes: 4e7b5671c6a8 ("block: remove i_bdev") Fixes: 37c3fc9abb25 ("block: simplify the block device claiming interface") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Christoph Hellwig <hch@lst.de> Cc: linux-fsdevel@vger.kernel.org Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-29mm: slub: call account_slab_page() after slab page initializationRoman Gushchin1-3/+2
It's convenient to have page->objects initialized before calling into account_slab_page(). In particular, this information can be used to pre-alloc the obj_cgroup vector. Let's call account_slab_page() a bit later, after the initialization of page->objects. This commit doesn't bring any functional change, but is required for further optimizations. [akpm@linux-foundation.org: undo changes needed by forthcoming mm-memcg-slab-pre-allocate-obj_cgroups-for-slab-caches-with-slab_account.patch] Link: https://lkml.kernel.org/r/20201110195753.530157-1-guro@fb.com Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-12-29zlib: move EXPORT_SYMBOL() and MODULE_LICENSE() out of dfltcc_syms.cRandy Dunlap4-19/+9
In commit 11fb479ff5d9 ("zlib: export S390 symbols for zlib modules"), I added EXPORT_SYMBOL()s to dfltcc_inflate.c but then Mikhail said that these should probably be in dfltcc_syms.c with the other EXPORT_SYMBOL()s. However, that is contrary to the current kernel style, which places EXPORT_SYMBOL() immediately after the function that it applies to, so move all EXPORT_SYMBOL()s to their respective function locations and drop the dfltcc_syms.c file. Also move MODULE_LICENSE() from the deleted file to dfltcc.c. [rdunlap@infradead.org: remove dfltcc_syms.o from Makefile] Link: https://lkml.kernel.org/r/20201227171837.15492-1-rdunlap@infradead.org Link: https://lkml.kernel.org/r/20201219052530.28461-1-rdunlap@infradead.org Fixes: 11fb479ff5d9 ("zlib: export S390 symbols for zlib modules") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Acked-by: Ilya Leoshkevich <iii@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Zaslonko Mikhail <zaslonko@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-12-29lib/zlib: fix inflating zlib streams on s390Ilya Leoshkevich1-2/+2
Decompressing zlib streams on s390 fails with "incorrect data check" error. Userspace zlib checks inflate_state.flags in order to byteswap checksums only for zlib streams, and s390 hardware inflate code, which was ported from there, tries to match this behavior. At the same time, kernel zlib does not use inflate_state.flags, so it contains essentially random values. For many use cases either zlib stream is zeroed out or checksum is not used, so this problem is masked, but at least SquashFS is still affected. Fix by always passing a checksum to and from the hardware as is, which matches zlib_inflate()'s expectations. Link: https://lkml.kernel.org/r/20201215155551.894884-1-iii@linux.ibm.com Fixes: 126196100063 ("lib/zlib: add s390 hardware support for kernel zlib_inflate") Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Mikhail Zaslonko <zaslonko@linux.ibm.com> Cc: <stable@vger.kernel.org> [5.6+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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