mirror of https://gitee.com/openkylin/linux.git
8e6cb470ba
The driver never calls platform_set_drvdata() , so platform_get_drvdata() in .remove returns NULL and thus $indio_dev variable in .remove is NULL. Then it's only a matter of dereferencing the indio_dev variable to make the kernel blow as seen below. This patch adds the platform_set_drvdata() call to fix the problem. root@armhf:~# rmmod at91-sama5d2_adc Unable to handle kernel NULL pointer dereference at virtual address 000001d4 pgd = dd57c000 [000001d4] *pgd=00000000 Internal error: Oops: 5 [#1] ARM Modules linked in: at91_sama5d2_adc(-) CPU: 0 PID: 1334 Comm: rmmod Not tainted 4.6.0-rc3-next-20160418+ #3 Hardware name: Atmel SAMA5 task: dd4fcc40 ti: de910000 task.ti: de910000 PC is at mutex_lock+0x4/0x24 LR is at iio_device_unregister+0x14/0x6c pc : [<c05f4624>] lr : [<c0471f74>] psr: a00d0013 sp : de911f00 ip : 00000000 fp : be898bd8 r10: 00000000 r9 : de910000 r8 : c0107724 r7 : 00000081 r6 : bf001048 r5 : 000001d4 r4 : 00000000 r3 : bf000000 r2 : 00000000 r1 : 00000004 r0 : 000001d4 Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c53c7d Table: 3d57c059 DAC: 00000051 Process rmmod (pid: 1334, stack limit = 0xde910208) Stack: (0xde911f00 to 0xde912000) 1f00: bf000000 00000000 df5c7e10 bf000010 bf000000 df5c7e10 df5c7e10 c0351ca8 1f20: c0351c84 df5c7e10 bf001048 c0350734 bf001048 df5c7e10 df5c7e44 c035087c 1f40: bf001048 7f62dd4c 00000800 c034fb30 bf0010c0 c0158ee8 de910000 31397461 1f60: 6d61735f 32643561 6364615f 00000000 de911f90 de910000 de910000 00000000 1f80: de911fb0 10c53c7d de911f9c c05f33d8 de911fa0 00910000 be898ecb 7f62dd10 1fa0: 00000000 c0107560 be898ecb 7f62dd10 7f62dd4c 00000800 6f844800 6f844800 1fc0: be898ecb 7f62dd10 00000000 00000081 00000000 7f62dd10 be898bd8 be898bd8 1fe0: b6eedab1 be898b6c 7f61056b b6eedab6 000d0030 7f62dd4c 00000000 00000000 [<c05f4624>] (mutex_lock) from [<c0471f74>] (iio_device_unregister+0x14/0x6c) [<c0471f74>] (iio_device_unregister) from [<bf000010>] (at91_adc_remove+0x10/0x3c [at91_sama5d2_adc]) [<bf000010>] (at91_adc_remove [at91_sama5d2_adc]) from [<c0351ca8>] (platform_drv_remove+0x24/0x3c) [<c0351ca8>] (platform_drv_remove) from [<c0350734>] (__device_release_driver+0x84/0x110) [<c0350734>] (__device_release_driver) from [<c035087c>] (driver_detach+0x8c/0x90) [<c035087c>] (driver_detach) from [<c034fb30>] (bus_remove_driver+0x4c/0xa0) [<c034fb30>] (bus_remove_driver) from [<c0158ee8>] (SyS_delete_module+0x110/0x1d0) [<c0158ee8>] (SyS_delete_module) from [<c0107560>] (ret_fast_syscall+0x0/0x3c) Code: e3520001 1affffd5 eafffff4 f5d0f000 (e1902f9f) ---[ end trace 86914d7ad3696fca ]--- Signed-off-by: Marek Vasut <marex@denx.de> Cc: Ludovic Desroches <ludovic.desroches@atmel.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org> |
||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| ad799x.c | ||
| ad7266.c | ||
| ad7291.c | ||
| ad7298.c | ||
| ad7476.c | ||
| ad7791.c | ||
| ad7793.c | ||
| ad7887.c | ||
| ad7923.c | ||
| ad_sigma_delta.c | ||
| at91-sama5d2_adc.c | ||
| at91_adc.c | ||
| axp288_adc.c | ||
| berlin2-adc.c | ||
| cc10001_adc.c | ||
| da9150-gpadc.c | ||
| exynos_adc.c | ||
| fsl-imx25-gcq.c | ||
| hi8435.c | ||
| imx7d_adc.c | ||
| ina2xx-adc.c | ||
| lp8788_adc.c | ||
| max1027.c | ||
| max1363.c | ||
| mcp320x.c | ||
| mcp3422.c | ||
| men_z188_adc.c | ||
| mxs-lradc.c | ||
| nau7802.c | ||
| palmas_gpadc.c | ||
| qcom-spmi-iadc.c | ||
| qcom-spmi-vadc.c | ||
| rockchip_saradc.c | ||
| ti-adc081c.c | ||
| ti-adc128s052.c | ||
| ti-adc0832.c | ||
| ti-ads1015.c | ||
| ti-ads8688.c | ||
| ti_am335x_adc.c | ||
| twl4030-madc.c | ||
| twl6030-gpadc.c | ||
| vf610_adc.c | ||
| viperboard_adc.c | ||
| xilinx-xadc-core.c | ||
| xilinx-xadc-events.c | ||
| xilinx-xadc.h | ||