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scsi: ufs: Fix a kernel crash during shutdown

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Fix the following kernel crash:

Unable to handle kernel paging request at virtual address ffffffc91e735000
Call trace:
 __queue_work+0x26c/0x624
 queue_work_on+0x6c/0xf0
 ufshcd_hold+0x12c/0x210
 __ufshcd_wl_suspend+0xc0/0x400
 ufshcd_wl_shutdown+0xb8/0xcc
 device_shutdown+0x184/0x224
 kernel_restart+0x4c/0x124
 __arm64_sys_reboot+0x194/0x264
 el0_svc_common+0xc8/0x1d4
 do_el0_svc+0x30/0x8c
 el0_svc+0x20/0x30
 el0_sync_handler+0x84/0xe4
 el0_sync+0x1bc/0x1c0

Fix this crash by ungating the clock before destroying the work queue on
which clock gating work is queued.

Link: https://lore.kernel.org/r/20211203231950.193369-15-bvanassche@acm.org
Tested-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2021-12-03 15:19:47 -08:00 committed by Martin K. Petersen
parent 1fbaa02dfd
commit 3489c34bd0
1 changed files with 10 additions and 5 deletions
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15
drivers/scsi/ufs/ufshcd.c
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@ -1648,7 +1648,8 @@ int ufshcd_hold(struct ufs_hba *hba, bool async)
bool flush_result;
unsigned long flags;
if (!ufshcd_is_clkgating_allowed(hba))
if (!ufshcd_is_clkgating_allowed(hba) ||
!hba->clk_gating.is_initialized)
goto out;
spin_lock_irqsave(hba->host->host_lock, flags);
hba->clk_gating.active_reqs++;
@ -1808,7 +1809,7 @@ static void __ufshcd_release(struct ufs_hba *hba)
if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended ||
hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL ||
hba->outstanding_tasks ||
hba->outstanding_tasks || !hba->clk_gating.is_initialized ||
hba->active_uic_cmd || hba->uic_async_done ||
hba->clk_gating.state == CLKS_OFF)
return;
@ -1943,11 +1944,15 @@ static void ufshcd_exit_clk_gating(struct ufs_hba *hba)
{
if (!hba->clk_gating.is_initialized)
return;
ufshcd_remove_clk_gating_sysfs(hba);
cancel_work_sync(&hba->clk_gating.ungate_work);
cancel_delayed_work_sync(&hba->clk_gating.gate_work);
destroy_workqueue(hba->clk_gating.clk_gating_workq);
/* Ungate the clock if necessary. */
ufshcd_hold(hba, false);
hba->clk_gating.is_initialized = false;
ufshcd_release(hba);
destroy_workqueue(hba->clk_gating.clk_gating_workq);
}
/* Must be called with host lock acquired */