On Thu, Dec 1, 2022 at 4:50 AM Bart Van Assche <bvanassche@xxxxxxx> wrote: > > On 11/30/22 02:17, Adrian Hunter wrote: > > On 1/11/22 16:24, peter.wang@xxxxxxxxxxxx wrote: > >> From: Peter Wang <peter.wang@xxxxxxxxxxxx> > >> > >> When SSU fail in wlun suspend flow, trigger error handlder and > > > > handlder -> handler > > > > Why / how does SSU fail? > > I'm not sure but the issue that Peter is trying to fix with this patch > may already have been fixed by my patch series "Fix a deadlock in the > UFS driver". We observe a similar failure scenario when a device tries to change power mode (e.g. due to autosuspend) while "purge" is in progress. It appears that in this case the "pm_only" counter is increased on the device queue prior to the attempt of entering a runtime suspended state, but not reduced upon it failing due to the device being busy with an ongoing purge. That leads to a deadlock of subsequent IO operations to the device. --Daniil
