On Wed, 2021-07-21 at 20:34 -0700, Bart Van Assche wrote: > Clearing a unit attention synchronously from inside the UFS error > handler > may trigger the following deadlock: > - ufshcd_err_handler() calls ufshcd_err_handling_unprepare() and the > latter > function calls ufshcd_clear_ua_wluns(). > - ufshcd_clear_ua_wluns() submits a REQUEST SENSE command and that > command > activates the SCSI error handler. > - The SCSI error handler calls ufshcd_host_reset_and_restore(). > - ufshcd_host_reset_and_restore() executes the following code: > ufshcd_schedule_eh_work(hba); > flush_work(&hba->eh_work); > > This sequence results in a deadlock (circular wait). Fix this by > requesting > sense data asynchronously. > > Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx> > Cc: Stanley Chu <stanley.chu@xxxxxxxxxxxx> > Cc: Can Guo <cang@xxxxxxxxxxxxxx> > Cc: Asutosh Das <asutoshd@xxxxxxxxxxxxxx> > Cc: Avri Altman <avri.altman@xxxxxxx> > Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx> Reviewed-by: Bean Huo <beanhuo@xxxxxxxxxx>
