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SubjectRe: [PATCH -stable] ath6kl: fix struct hif_scatter_req list handling
On 02/20/2015, 04:20 PM, Kalle Valo wrote:
> Josh Cartwright <joshc@ni.com> writes:
>
>> From: Kalle Valo <kvalo@qca.qualcomm.com>
>>
>> commit 31b9cc9a873dcab161999622314f98a75d838975 upstream.
>>
>> Jason noticed that with Yocto GCC 4.8.1 ath6kl crashes with this iperf command:
>>
>> iperf -c $TARGET_IP -i 5 -t 50 -w 1M
>>
>> The crash was:
>>
>> Unable to handle kernel paging request at virtual address 1a480000
>> pgd = 80004000
>> [1a480000] *pgd=00000000
>> Internal error: Oops: 805 [#1] SMP ARM
>> Modules linked in: ath6kl_sdio ath6kl_core [last unloaded: ath6kl_core]
>> CPU: 0 PID: 1953 Comm: kworker/u4:0 Not tainted 3.10.9-1.0.0_alpha+dbf364b #1
>> Workqueue: ath6kl ath6kl_sdio_write_async_work [ath6kl_sdio]
>> task: dcc9a680 ti: dc9ae000 task.ti: dc9ae000
>> PC is at v7_dma_clean_range+0x20/0x38
>> LR is at dma_cache_maint_page+0x50/0x54
>> pc : [<8001a6f8>] lr : [<800170fc>] psr: 20000093
>> sp : dc9afcf8 ip : 8001a748 fp : 00000004
>> r10: 00000000 r9 : 00000001 r8 : 00000000
>> r7 : 00000001 r6 : 00000000 r5 : 80cb7000 r4 : 03f9a480
>> r3 : 0000001f r2 : 00000020 r1 : 1a480000 r0 : 1a480000
>> Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel
>> Control: 10c53c7d Table: 6cc5004a DAC: 00000015
>> Process kworker/u4:0 (pid: 1953, stack limit = 0xdc9ae238)
>> Stack: (0xdc9afcf8 to 0xdc9b0000)
>> fce0: 80c9b29c 00000000
>> fd00: 00000000 80017134 8001a748 dc302ac0 00000000 00000000 dc454a00 80c12ed8
>> fd20: dc115410 80017238 00000000 dc454a10 00000001 80017588 00000001 00000000
>> fd40: 00000000 dc302ac0 dc9afe38 dc9afe68 00000004 80c12ed8 00000000 dc454a00
>> fd60: 00000004 80436f88 00000000 00000000 00000600 0000ffff 0000000c 80c113c4
>> fd80: 80c9b29c 00000001 00000004 dc115470 60000013 dc302ac0 dc46e000 dc302800
>> fda0: dc9afe10 dc302b78 60000013 dc302ac0 dc46e000 00000035 dc46e5b0 80438c90
>> fdc0: dc9afe10 dc302800 dc302800 dc9afe68 dc9afe38 80424cb4 00000005 dc9afe10
>> fde0: dc9afe20 80424de8 dc9afe10 dc302800 dc46e910 80424e90 dc473c00 dc454f00
>> fe00: 000001b5 7f619d64 dcc7c830 00000000 00000000 dc9afe38 dc9afe68 00000000
>> fe20: 00000000 00000000 dc9afe28 dc9afe28 80424d80 00000000 00000035 9cac0034
>> fe40: 00000000 00000000 00000000 00000000 000001b5 00000000 00000000 00000000
>> fe60: dc9afe68 dc9afe10 3b9aca00 00000000 00000080 00000034 00000000 00000100
>> fe80: 00000000 00000000 dc9afe10 00000004 dc454a00 00000000 dc46e010 dc46e96c
>> fea0: dc46e000 dc46e964 00200200 00100100 dc46e910 7f619ec0 00000600 80c0e770
>> fec0: dc15a900 dcc7c838 00000000 dc46e954 8042d434 dcc44680 dc46e954 dc004400
>> fee0: dc454500 00000000 00000000 dc9ae038 dc004400 8003c450 dcc44680 dc004414
>> ff00: dc46e954 dc454500 00000001 dcc44680 dc004414 dcc44698 dc9ae000 dc9ae030
>> ff20: 00000001 dc9ae000 dc004400 8003d158 8003d020 00000000 00000000 80c53941
>> ff40: dc9aff64 dcb71ea0 00000000 dcc44680 8003d020 00000000 00000000 00000000
>> ff60: 00000000 80042480 00000000 00000000 000000f8 dcc44680 00000000 00000000
>> ff80: dc9aff80 dc9aff80 00000000 00000000 dc9aff90 dc9aff90 dc9affac dcb71ea0
>> ffa0: 800423cc 00000000 00000000 8000e018 00000000 00000000 00000000 00000000
>> ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>> ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
>> [<8001a6f8>] (v7_dma_clean_range+0x20/0x38) from [<800170fc>] (dma_cache_maint_page+0x50/0x54)
>> [<800170fc>] (dma_cache_maint_page+0x50/0x54) from [<80017134>] (__dma_page_cpu_to_dev+0x34/0x9c)
>> [<80017134>] (__dma_page_cpu_to_dev+0x34/0x9c) from [<80017238>] (arm_dma_map_page+0x64/0x68)
>> [<80017238>] (arm_dma_map_page+0x64/0x68) from [<80017588>] (arm_dma_map_sg+0x7c/0xf4)
>> [<80017588>] (arm_dma_map_sg+0x7c/0xf4) from [<80436f88>] (sdhci_send_command+0x894/0xe00)
>> [<80436f88>] (sdhci_send_command+0x894/0xe00) from [<80438c90>] (sdhci_request+0xc0/0x1ec)
>> [<80438c90>] (sdhci_request+0xc0/0x1ec) from [<80424cb4>] (mmc_start_request+0xb8/0xd4)
>> [<80424cb4>] (mmc_start_request+0xb8/0xd4) from [<80424de8>] (__mmc_start_req+0x60/0x84)
>> [<80424de8>] (__mmc_start_req+0x60/0x84) from [<80424e90>] (mmc_wait_for_req+0x10/0x20)
>> [<80424e90>] (mmc_wait_for_req+0x10/0x20) from [<7f619d64>] (ath6kl_sdio_scat_rw.isra.10+0x1dc/0x240 [ath6kl_sdio])
>> [<7f619d64>] (ath6kl_sdio_scat_rw.isra.10+0x1dc/0x240 [ath6kl_sdio]) from [<7f619ec0>] (ath6kl_sdio_write_async_work+0x5c/0x104 [ath6kl_sdio])
>> [<7f619ec0>] (ath6kl_sdio_write_async_work+0x5c/0x104 [ath6kl_sdio]) from [<8003c450>] (process_one_work+0x10c/0x370)
>> [<8003c450>] (process_one_work+0x10c/0x370) from [<8003d158>] (worker_thread+0x138/0x3fc)
>> [<8003d158>] (worker_thread+0x138/0x3fc) from [<80042480>] (kthread+0xb4/0xb8)
>> [<80042480>] (kthread+0xb4/0xb8) from [<8000e018>] (ret_from_fork+0x14/0x3c)
>> Code: e1a02312 e2423001 e1c00003 f57ff04f (ee070f3a)
>> ---[ end trace 0c038f0b8e0b67a3 ]---
>> Kernel panic - not syncing: Fatal exception
>>
>> Jason's analysis:
>>
>> "The GCC 4.8.1 compiler will not do the for-loop till scat_entries, instead,
>> it only run one round loop. This may be caused by that the GCC 4.8.1 thought
>> that the scat_list only have one item and then no need to do full iteration,
>> but this is simply wrong by looking at the assebly code. This will cause the sg
>> buffer not get set when scat_entries > 1 and thus lead to kernel panic.
>>
>> Note: This issue not observed with GCC 4.7.2, only found on the GCC 4.8.1)"
>>
>> Fix this by using the normal [0] style for defining unknown number of list
>> entries following the struct. This also fixes corruption with scat_q_depth, which
>> was mistankely added to the end of struct and overwritten if there were more
>> than item in the scat list.
>>
>> Reported-by: Jason Liu <r64343@freescale.com>
>> Tested-by: Jason Liu <r64343@freescale.com>
>> Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
>> ---
>> We ran into this issue in the 3.14.y stable tree which has been fixed upstream
>> since 3.16. Please consider pulling it back to 3.14.y at least; it may be
>> relevant further back, but it isn't clear when the issue first cropped up. I'm
>> hoping Kalle can comment.
>
> I agree, it would be good to get this to stable.

Now added to 3.12. Thanks.


--
js
suse labs


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