From c1d40a527e885a40bb9ea6c46a1b1145d42b66a0 Mon Sep 17 00:00:00 2001 From: "Martin K. Petersen" Date: Tue, 15 Jul 2014 12:49:17 -0400 Subject: 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 Tested-by: KY Srinivasan Reviewed-by: KY Srinivasan Signed-off-by: Martin K. Petersen CC: Signed-off-by: Christoph Hellwig --- drivers/scsi/sd.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/scsi/sd.c') 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 -- cgit v1.2.3