On Thu, 27 Dec 2018, Icenowy Zheng wrote: > Currently the code will set US_FL_SANE_SENSE flag unconditionally if > device claims SPC3+, however we should allow US_FL_BAD_SENSE flag to > prevent this behavior, because SMI SM3350 UFS-USB bridge controller, > which claims SPC4, will show strange behavior with 96-byte sense > (put the chip into a wrong state that cannot read/write anything). > > Check the presence of US_FL_BAD_SENSE when assuming US_FL_SANE_SENSE on > SPC4+ devices. > > Signed-off-by: Icenowy Zheng <icenowy@xxxxxxx> > --- > drivers/usb/storage/scsiglue.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c > index fde2e71a6ade..699fe9557127 100644 > --- a/drivers/usb/storage/scsiglue.c > +++ b/drivers/usb/storage/scsiglue.c > @@ -236,7 +236,8 @@ static int slave_configure(struct scsi_device *sdev) > sdev->try_rc_10_first = 1; > > /* assume SPC3 or latter devices support sense size > 18 */ > - if (sdev->scsi_level > SCSI_SPC_2) > + if (sdev->scsi_level > SCSI_SPC_2 && > + !(us->fflags & US_FL_BAD_SENSE)) > us->fflags |= US_FL_SANE_SENSE; Please update the comment so that it matches the new code. Alan Stern
