Bug 60711

Summary: USB drive no longer detected as removable storage media
Product: IO/Storage Reporter: trallala
Component: SCSIAssignee: linux-scsi (linux-scsi)
Status: NEW ---    
Severity: low CC: alan, martin.petersen
Priority: P1    
Hardware: i386   
OS: Linux   
Kernel Version: 3.10.3 Subsystem:
Regression: Yes Bisected commit-id:
Attachments: DMESG excerpt from success and failure

Description trallala 2013-08-07 08:15:30 UTC 
Created attachment 107132 [details]
DMESG excerpt from success and failure

This patch

commit 98dcc2946adbe4349ef1ef9b99873b912831edd4
Author: Martin K. Petersen <martin.petersen@oracle.com>
Date:   Thu Jun 6 22:15:55 2013 -0400
SCSI: sd: Update WRITE SAME heuristics
commit 66c28f97120e8a621afd5aa7a31c4b85c547d33d upstream.

introduced with kernel patch-3.10.3 effectively breaks detection of some USB drives as removable storage media. The concerned drives are recognized by the SCSI layer, but are no longer available as removable storage (see attachment).

Commenting out the following if-clause from sd.c (function sd_read_write_same)
        if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE))
            sdev->no_write_same = 1;
makes anything working as expected.