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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2014-07-15 18:49:17 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-07-25 23:16:41 +0200 |
| commit | c1d40a527e885a40bb9ea6c46a1b1145d42b66a0 (patch) | |
| tree | bbe0eb4aae1aa3b36c8ff3ad1fd99bfdb62621f6 /drivers/scsi | |
| parent | scsi: move the writeable field from struct scsi_device to struct scsi_cd (diff) | |
| download | linux-c1d40a527e885a40bb9ea6c46a1b1145d42b66a0.tar.xz linux-c1d40a527e885a40bb9ea6c46a1b1145d42b66a0.zip | |
scsi: add a blacklist flag which enables VPD page inquiries
Despite supporting modern SCSI features some storage devices continue to
claim conformance to an older version of the SPC spec. This is done for
compatibility with legacy operating systems.
Linux by default will not attempt to read VPD pages on devices that
claim SPC-2 or older. Introduce a blacklist flag that can be used to
trigger VPD page inquiries on devices that are known to support them.
Reported-by: KY Srinivasan <kys@microsoft.com>
Tested-by: KY Srinivasan <kys@microsoft.com>
Reviewed-by: KY Srinivasan <kys@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 4 | ||||
| -rw-r--r-- | drivers/scsi/sd.c | 5 |
2 files changed, 8 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index a5a0bdeba857..50536cd6b3f2 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -928,7 +928,9 @@ static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT; - if (*bflags & BLIST_SKIP_VPD_PAGES) + if (*bflags & BLIST_TRY_VPD_PAGES) + sdev->try_vpd_pages = 1; + else if (*bflags & BLIST_SKIP_VPD_PAGES) sdev->skip_vpd_pages = 1; transport_configure_device(&sdev->sdev_gendev); diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 377a5206017e..4d72831eafe5 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2726,6 +2726,11 @@ static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer) static int sd_try_extended_inquiry(struct scsi_device *sdp) { + /* Attempt VPD inquiry if the device blacklist explicitly calls + * for it. + */ + if (sdp->try_vpd_pages) + return 1; /* * Although VPD inquiries can go to SCSI-2 type devices, * some USB ones crash on receiving them, and the pages |