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FROMLIST: scsi: ufs: Flush exception event before suspend

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Exception event can be raised by the device when system
suspend is in progress. This will result in unclocked
register access in exception event handler as clocks will
be turned off during suspend. This change makes sure to flush
exception event handler work in suspend before disabling
clocks to avoid unclocked register access issue.

Bug: 143632303
Change-Id: Ic01b5e4c7bc95d1ad9fa3c6fb19b848206a13306
Link: https://lore.kernel.org/patchwork/patch/1149888/
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
This commit is contained in:
Sayali Lokhande 2017-08-23 19:44:14 +05:30 committed by Todd Kjos
parent c1f1db3714
commit 12db3a26e4
1 changed files with 18 additions and 3 deletions
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21
drivers/scsi/ufs/ufshcd.c
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@ -4835,8 +4835,15 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
* UFS device needs urgent BKOPs.
*/
if (!hba->pm_op_in_progress &&
ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
schedule_work(&hba->eeh_work);
ufshcd_is_exception_event(lrbp->ucd_rsp_ptr)) {
/*
* Prevent suspend once eeh_work is scheduled
* to avoid deadlock between ufshcd_suspend
* and exception event handler.
*/
if (schedule_work(&hba->eeh_work))
pm_runtime_get_noresume(hba->dev);
}
break;
case UPIU_TRANSACTION_REJECT_UPIU:
/* TODO: handle Reject UPIU Response */
@ -5296,7 +5303,14 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
out:
scsi_unblock_requests(hba->host);
pm_runtime_put_sync(hba->dev);
/*
* pm_runtime_get_noresume is called while scheduling
* eeh_work to avoid suspend racing with exception work.
* Hence decrement usage counter using pm_runtime_put_noidle
* to allow suspend on completion of exception event handler.
*/
pm_runtime_put_noidle(hba->dev);
pm_runtime_put(hba->dev);
return;
}
@ -7974,6 +7988,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
goto enable_gating;
}
flush_work(&hba->eeh_work);
ret = ufshcd_link_state_transition(hba, req_link_state, 1);
if (ret)
goto set_dev_active;