From: Icenowy Zheng <icenowy@aosc.io>
To: Alan Stern <stern@rowland.harvard.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net,
linux-kernel@vger.kernel.org
Cc: Icenowy Zheng <icenowy@aosc.io>
Subject: [PATCH v2 1/2] USB: storage: don't insert sane sense for SPC3+ when bad sense specified
Date: Thu, 3 Jan 2019 11:26:17 +0800 [thread overview]
Message-ID: <20190103032618.9237-2-icenowy@aosc.io> (raw)
In-Reply-To: <20190103032618.9237-1-icenowy@aosc.io>
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@aosc.io>
---
Changes in v2:
- Changed the comment to note the check.
drivers/usb/storage/scsiglue.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index fde2e71a6ade..a73ea495d5a7 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -235,8 +235,12 @@ static int slave_configure(struct scsi_device *sdev)
if (!(us->fflags & US_FL_NEEDS_CAP16))
sdev->try_rc_10_first = 1;
- /* assume SPC3 or latter devices support sense size > 18 */
- if (sdev->scsi_level > SCSI_SPC_2)
+ /*
+ * assume SPC3 or latter devices support sense size > 18
+ * unless US_FL_BAD_SENSE quirk is specified.
+ */
+ if (sdev->scsi_level > SCSI_SPC_2 &&
+ !(us->fflags & US_FL_BAD_SENSE))
us->fflags |= US_FL_SANE_SENSE;
/*
--
2.18.1
next prev parent reply other threads:[~2019-01-03 3:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-03 3:26 [PATCH v2 0/2] USB Storage quirk for SMI SM3350 Icenowy Zheng
2019-01-03 3:26 ` Icenowy Zheng [this message]
2019-01-03 3:26 ` [PATCH v2 2/2] USB: storage: add " Icenowy Zheng
2019-01-03 15:06 ` [PATCH v2 0/2] USB Storage " Alan Stern
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