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| author |   Dong Aisheng <aisheng.dong@nxp.com> | 2017-03-23 12:53:18 +0800 |
|---|---|---|
| committer |   Shawn Guo <shawnguo@kernel.org> | 2017-03-24 13:41:30 +0800 |
| commit | 55b0baa2542f1dbaf33989eab5a26a23a8aca345 (patch) | |
| tree | 28cab389c98bac3c9522144c449dd5c2af17c9ce /drivers/soc | |
| parent | soc: imx: move PGC handling to a new GPC driver (diff) | |
| download | linux-dev-55b0baa2542f1dbaf33989eab5a26a23a8aca345.tar.xz linux-dev-55b0baa2542f1dbaf33989eab5a26a23a8aca345.zip | |
soc: imx: gpc: fix gpc clk get error handling
We got a following kernel crash once supplying one more IPG
clock in GPC node in devicetree. The original error handling of
clocks get is a bit wrong that when reaching the maximum clock
get error, the index 'i' is already GPC_CLK_MAX which can't be used
as the array index for clk_put operations.
[ 3.000110] imx-gpc 20dc000.gpc: more than 6 clocks
[ 3.005141] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 3.013487] pgd = c0004000
[ 3.016300] [00000000] *pgd=00000000
[ 3.020060] Internal error: Oops: 805 [#1] SMP ARM
[ 3.024957] Modules linked in:
[ 3.028122] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 4.11.0-rc1-00056-g813791b-dirty #1140
[ 3.037801] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[ 3.044435] task: ef298000 task.stack: ef294000
[ 3.049080] PC is at __clk_put+0x38/0xec
[ 3.053103] LR is at 0x7f54ce9a
[ 3.056345] pc : [<c0537984>] lr : [<7f54ce9a>] psr: 60000013
[ 3.056345] sp : ef295d48 ip : c8a582b2 fp : ef295d64
[ 3.068026] r10: ee9fc400 r9 : 00000000 r8 : ef398c10
[ 3.073354] r7 : ef398c10 r6 : c1071264 r5 : c10710f0 r4 : eea5be80
[ 3.079986] r3 : 00000000 r2 : 00000000 r1 : 00000100 r0 : 00000001
[ 3.086621] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 3.093863] Control: 10c5387d Table: 1000404a DAC: 00000051
[ 3.099712] Process swapper/0 (pid: 1, stack limit = 0xef294210)
[ 3.105823] Stack: (0xef295d48 to 0xef296000)
...
[ 3.292660] Backtrace:
[ 3.295222] [<c053794c>] (__clk_put) from [<c0531028>] (clk_put+0x18/0x1c)
[ 3.302206] r6:c1071264 r5:c10710f0 r4:c107124c r3:00000001
[ 3.307977] [<c0531010>] (clk_put) from [<c0546ba0>] (imx_pgc_get_clocks+0x64/0x78)
[ 3.315747] [<c0546b3c>] (imx_pgc_get_clocks) from [<c0547124>] (imx_gpc_probe+0x204/0x31c)
[ 3.324209] r7:00000000 r6:c1070eb0 r5:00000001 r4:ef398c00
[ 3.329980] [<c0546f20>] (imx_gpc_probe) from [<c05e65f0>] (platform_drv_probe+0x5c/0xc0)
[ 3.338270] r10:c0f00608 r9:00000000 r8:00000000 r7:fffffdfb r6:c1070f20 r5:ef398c10
[ 3.346207] r4:ef398c10
[ 3.348849] [<c05e6594>] (platform_drv_probe) from [<c05e4250>] (driver_probe_device+0x214/0x2ec)
[ 3.357835] r7:c1070f20 r6:00000000 r5:c18cea74 r4:ef398c10
[ 3.363607] [<c05e403c>] (driver_probe_device) from [<c05e43ec>] (__driver_attach+0xc4/0xc8)
[ 3.372159] r9:c0f8b858 r8:c0f8b850 r7:00000000 r6:ef398c44 r5:c1070f20 r4:ef398c10
[ 3.380017] [<c05e4328>] (__driver_attach) from [<c05e21fc>] (bus_for_each_dev+0x7c/0xb0)
[ 3.388304] r6:c05e4328 r5:c1070f20 r4:00000000 r3:00000000
[ 3.394074] [<c05e2180>] (bus_for_each_dev) from [<c05e3bc4>] (driver_attach+0x28/0x30)
[ 3.402188] r6:c107f3e8 r5:eea5be00 r4:c1070f20
[ 3.406913] [<c05e3b9c>] (driver_attach) from [<c05e3740>] (bus_add_driver+0x19c/0x224)
[ 3.415034] [<c05e35a4>] (bus_add_driver) from [<c05e52fc>] (driver_register+0x88/0x108)
[ 3.423235] r7:c10e1000 r6:00000000 r5:c0f57d2c r4:c1070f20
[ 3.429004] [<c05e5274>] (driver_register) from [<c05e6534>] (__platform_driver_register+0x40/0x54)
[ 3.438160] r5:c0f57d2c r4:00000006
[ 3.441846] [<c05e64f4>] (__platform_driver_register) from [<c0f57d44>] (imx_gpc_driver_init+0x18/0x20)
[ 3.451360] [<c0f57d2c>] (imx_gpc_driver_init) from [<c010200c>] (do_one_initcall+0x4c/0x180)
[ 3.460008] [<c0101fc0>] (do_one_initcall) from [<c0f00e40>] (kernel_init_freeable+0x130/0x1f8)
[ 3.468820] r9:c0f8b858 r8:c0f8b850 r6:c0fc2414 r5:c10e1000 r4:00000006
[ 3.475637] [<c0f00d10>] (kernel_init_freeable) from [<c0ae6aec>] (kernel_init+0x18/0x124)
[ 3.484014] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c0ae6ad4
[ 3.491951] r4:00000000
[ 3.494590] [<c0ae6ad4>] (kernel_init) from [<c01088d0>] (ret_from_fork+0x14/0x24)
[ 3.502267] r4:00000000 r3:ef294000
[ 3.505947] Code: e5943014 e5942018 e3530000 e3a01c01 (e5823000)
[ 3.512215] ---[ end trace 375f9f2a5ddeff3c ]---
[ 3.517036] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
Cc: Lucas Stach <l.stach@pengutronix.de>
Fixes: 721cabf6c660 ("soc: imx: move PGC handling to a new GPC driver")
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/soc')
| -rw-r--r-- | drivers/soc/imx/gpc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/soc/imx/gpc.c b/drivers/soc/imx/gpc.c index 1e9b3b81f466..c9bfdfd783d0 100644 --- a/drivers/soc/imx/gpc.c +++ b/drivers/soc/imx/gpc.c @@ -143,7 +143,7 @@ static int imx_pgc_get_clocks(struct device *dev, struct imx_pm_domain *domain) return 0; clk_err: - for (; i >= 0; i--) + while (i--) clk_put(domain->clk[i]); return ret; |