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scsi: ufs: skip shutdown if hba is not powered 

In some cases, hba may go through shutdown flow without successful
initialization and then make system hang.

For example, if ufshcd_change_power_mode() gets error and leads to
ufshcd_hba_exit() to release resources of the host, future shutdown flow
may hang the system since the host register will be accessed in unpowered
state.

To solve this issue, simply add checking to skip shutdown for above kind of
situation.

Link: https://lore.kernel.org/r/1568780438-28753-1-git-send-email-stanley.chu@mediatek.com
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Acked-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
alistair/sunxi64-5.4-dsi
Stanley Chu 2019-09-18 12:20:38 +08:00 committed by Martin K. Petersen
parent c9c5374937
commit f51913eef2
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/ufs/ufshcd.c
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@ -8140,6 +8140,9 @@ int ufshcd_shutdown(struct ufs_hba *hba)
{
int ret = 0;
if (!hba->is_powered)
goto out;
if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba))
goto out;