Re: [PATCH v1 1/1] ufs: core: fix shift issue in ufshcd_clear_cmd

[Martin K. Petersen]

On Mon, 05 Feb 2024 18:49:04 +0800, alice.chao@xxxxxxxxxxxx wrote:

> When task_tag > 32 (in mcq mode), 1U << task_tag will out of bound
> for u32 mask. Fix this bug to prevent SHIFT_ISSUE (Bitwise shifts
> that are out of bounds for their data type).
> 
> [name:debug_monitors&]Unexpected kernel BRK exception at EL1
> [name:traps&]Internal error: BRK handler: 00000000f2005514 [#1] PREEMPT SMP
> [name:mediatek_cpufreq_hw&]cpufreq stop DVFS log done
> [name:mrdump&]Kernel Offset: 0x1ba5800000 from 0xffffffc008000000
> [name:mrdump&]PHYS_OFFSET: 0x80000000
> [name:mrdump&]pstate: 22400005 (nzCv daif +PAN -UAO)
> [name:mrdump&]pc : [0xffffffdbaf52bb2c] ufshcd_clear_cmd+0x280/0x288
> [name:mrdump&]lr : [0xffffffdbaf52a774] ufshcd_wait_for_dev_cmd+0x3e4/0x82c
> [name:mrdump&]sp : ffffffc0081471b0
> <snip>
> Workqueue: ufs_eh_wq_0 ufshcd_err_handler
> Call trace:
>  dump_backtrace+0xf8/0x144
>  show_stack+0x18/0x24
>  dump_stack_lvl+0x78/0x9c
>  dump_stack+0x18/0x44
>  mrdump_common_die+0x254/0x480 [mrdump]
>  ipanic_die+0x20/0x30 [mrdump]
>  notify_die+0x15c/0x204
>  die+0x10c/0x5f8
>  arm64_notify_die+0x74/0x13c
>  do_debug_exception+0x164/0x26c
>  el1_dbg+0x64/0x80
>  el1h_64_sync_handler+0x3c/0x90
>  el1h_64_sync+0x68/0x6c
>  ufshcd_clear_cmd+0x280/0x288
>  ufshcd_wait_for_dev_cmd+0x3e4/0x82c
>  ufshcd_exec_dev_cmd+0x5bc/0x9ac
>  ufshcd_verify_dev_init+0x84/0x1c8
>  ufshcd_probe_hba+0x724/0x1ce0
>  ufshcd_host_reset_and_restore+0x260/0x574
>  ufshcd_reset_and_restore+0x138/0xbd0
>  ufshcd_err_handler+0x1218/0x2f28
>  process_one_work+0x5fc/0x1140
>  worker_thread+0x7d8/0xe20
>  kthread+0x25c/0x468
>  ret_from_fork+0x10/0x20
> 
> [...]

Applied to 6.8/scsi-fixes, thanks!

[1/1] ufs: core: fix shift issue in ufshcd_clear_cmd
      https://git.kernel.org/mkp/scsi/c/b513d30d59bb

-- 
Martin K. Petersen	Oracle Linux Engineering