Re: [PATCH v6 1/3] scsi: ufs: core: Clear saved errors in ufshcd_link_recovery()

[Peter Wang <peter.wang@mediatek.com>]

On Fri, 2026-11-06 at 11:15 +0900, HOYOUNG SEO wrote:
> ufshcd_link_recovery() resets both the device and the host and then
> re-establishes the link. Unlike ufshcd_reset_and_restore(), however,
> it
> does not clear hba->saved_err, hba->saved_uic_err and hba-
> >force_reset,
> so the errors latched before the recovery remain pending after the
> link
> has already been recovered.
> 
> When ufshcd_err_handler() runs afterwards,
> ufshcd_err_handling_should_stop() sees these stale errors. The error
> handler then quiesces all queues and, depending on the latched errors
> (e.g. a fatal error or UFSHCD_UIC_DL_PA_INIT_ERROR), performs another
> full ufshcd_reset_and_restore() on a link that is already
> operational.
> 
> Cache and clear the saved errors before the reset, as
> ufshcd_reset_and_restore() does, so that only errors raised during or
> after the recovery are left to the error handler. Put them back if
> the
> recovery fails.
> 
> Fixes: 35dabf4503b9 ("scsi: ufs: core: Use link recovery when h8 exit
> fails during runtime resume")
> Signed-off-by: HOYOUNG SEO <hy50.seo@samsung.com>
> Reviewed-by: Bart Van Assche <bvanassche@acm.org>
> ---

Reviewed-by: Peter Wang <peter.wang@mediatek.com>