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authorAlan Stern <stern@rowland.harvard.edu>2012-01-10 13:43:30 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-02-08 17:36:41 -0800
commit09b6b51b0b6c1b9bb61815baf205e4d74c89ff04 (patch)
tree03b7c55b764dc555b1d89528fac457a740f897c3 /drivers/scsi/sd.c
parentde8c46bfc032fbdf490cfb67f534d2a0188ebeb0 (diff)
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SCSI & usb-storage: add flags for VPD pages and REPORT LUNS
This patch (as1507) adds a skip_vpd_pages flag to struct scsi_device and a no_report_luns flag to struct scsi_target. The first is used to control whether sd will look at VPD pages for information on block provisioning, limits, and characteristics. The second prevents scsi_report_lun_scan() from issuing a REPORT LUNS command. The patch also modifies usb-storage to set the new flag bits for all USB devices and targets, and to stop adjusting the scsi_level value. Historically we have seen that USB mass-storage devices often don't support VPD pages or REPORT LUNS properly. Until now we have avoided these things by setting the scsi_level to SCSI_2 for all USB devices. But this has the side effect of storing the LUN bits into the second byte of each CDB, and now we have a report of a device which doesn't like that. The best solution is to stop abusing scsi_level and instead have separate flags for VPD pages and REPORT LUNS. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-by: Perry Wagle <wagle@mac.com> CC: Matthew Dharm <mdharm-usb@one-eyed-alien.net> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index c691fb50e6cb..d173b90b25e9 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2349,7 +2349,7 @@ static int sd_try_extended_inquiry(struct scsi_device *sdp)
* some USB ones crash on receiving them, and the pages
* we currently ask for are for SPC-3 and beyond
*/
- if (sdp->scsi_level > SCSI_SPC_2)
+ if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
return 1;
return 0;
}