On 25/02/2022 01:56, Jaegeuk Kim wrote:
The commit b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun") moved hba->shutting_down from ufshcd_shutdown to ufshcd_wl_shutdown, which introduced regression as belows.
ufshcd_err_handler started; HBA state eh_non_fatal; powered 1; shutting down 1; saved_err = 4; saved_uic_err = 64; force_reset = 0 ... task:init state:D stack: 0 pid: 1 ppid: 0 flags:0x04000008 Call trace: __switch_to+0x25c/0x5e0 __schedule+0x68c/0xaa8 schedule+0x12c/0x24c schedule_timeout+0x98/0x138 wait_for_common_io+0x13c/0x30c blk_execute_rq+0xb0/0x10c __scsi_execute+0x100/0x27c ufshcd_set_dev_pwr_mode+0x1c8/0x408 __ufshcd_wl_suspend+0x564/0x688 ufshcd_wl_shutdown+0xa8/0xc0 device_shutdown+0x234/0x578 kernel_restart+0x4c/0x140 __arm64_sys_reboot+0x3a0/0x414 el0_svc_common+0xd0/0x1e4 el0_svc+0x28/0x88 el0_sync_handler+0x8c/0xf0 el0_sync+0x1c0/0x200
The init for reboot was stuck, since ufshcd_err_hanlder was skipped when shutting down WLUN. This patch allows to run the error handler and let disable it during final ufshcd_shutdown only.
I do not understand why it is stuck? If there was a non-fatal error, the request should complete anyway, or at least timeout.
Cc: stable@vger.kernel.org Fixes: b294ff3e3449 ("scsi: ufs: core: Enable power management for wlun") Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org
drivers/scsi/ufs/ufshcd.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 460d2b440d2e..a37813b474d0 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -9178,10 +9178,6 @@ static void ufshcd_wl_shutdown(struct device *dev) hba = shost_priv(sdev->host);
- down(&hba->host_sem);
- hba->shutting_down = true;
- up(&hba->host_sem);
- /* Turn on everything while shutting down */ ufshcd_rpm_get_sync(hba); scsi_device_quiesce(sdev);
@@ -9387,6 +9383,10 @@ EXPORT_SYMBOL(ufshcd_runtime_resume); */ int ufshcd_shutdown(struct ufs_hba *hba) {
- down(&hba->host_sem);
- hba->shutting_down = true;
- up(&hba->host_sem);
This does not seem right because the device is not accessible after __ufshcd_wl_suspend(hba, UFS_SHUTDOWN_PM), so shutting_down needs to be set before.
- if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba)) goto out;