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[SCSI] sd: fix USB devices incorrectly reporting DIF support

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Some USB devices set the protect bit in the INQUIRY data which
currently causes the DIF code in sd to assume (incorrectly) that they
support READ_CAPACITY(16).  Fix this (only for the time being) by
making sure we only believe the protect bit in the inquiry data if the
device claims conformance to SCSI-3 or above.

Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Hugh Dickins 2008-08-06 18:21:18 +01:00 committed by James Bottomley
parent 0967d61ea0
commit d211f052fa
1 changed files with 2 additions and 1 deletions
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3
include/scsi/scsi_device.h
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@ -6,6 +6,7 @@
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/blkdev.h>
#include <scsi/scsi.h>
#include <asm/atomic.h>
struct request_queue;
@ -426,7 +427,7 @@ static inline int scsi_device_enclosure(struct scsi_device *sdev)
static inline int scsi_device_protection(struct scsi_device *sdev)
{
return sdev->inquiry[5] & (1<<0);
return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
}
#define MODULE_ALIAS_SCSI_DEVICE(type) \