linux-kernel - [PATCH 1/2] USB: storage: don't insert sane sense for SPC3+ when bad sense specified

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Message-Id: <20181227143437.17151-2-icenowy@aosc.io>
Date:   Thu, 27 Dec 2018 22:34:36 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
        linux-kernel@...r.kernel.org
Cc:     Icenowy Zheng <icenowy@...c.io>
Subject: [PATCH 1/2] USB: storage: don't insert sane sense for SPC3+ when bad sense specified

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@...c.io>
---
 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;
 
 		/*
-- 
2.18.1