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USB: UAS: introduce a quirk to set no_write_same

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commit 8010622c86ca5bb44bc98492f5968726fc7c7a21 upstream.

UAS does not share the pessimistic assumption storage is making that
devices cannot deal with WRITE_SAME.  A few devices supported by UAS,
are reported to not deal well with WRITE_SAME. Those need a quirk.

Add it to the device that needs it.

Reported-by: David C. Partridge <david.partridge@perdrix.co.uk>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20201209152639.9195-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum
2020-12-09 16:26:39 +01:00
committed by Greg Kroah-Hartman
parent d769a22dc0
commit 2440c1cb25
5 changed files with 14 additions and 2 deletions
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3
drivers/usb/storage/uas.c
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@@ -867,6 +867,9 @@ static int uas_slave_configure(struct scsi_device *sdev)
if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
sdev->no_read_capacity_16 = 1;
/* Some disks cannot handle WRITE_SAME */
if (devinfo->flags & US_FL_NO_SAME)
sdev->no_write_same = 1;
/*
* Some disks return the total number of blocks in response
* to READ CAPACITY rather than the highest block number.