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imsm: fix reading scsi serial
authorArtur Paszkiewicz <artur.paszkiewicz@intel.com>
Thu, 2 Nov 2017 15:10:57 +0000 (16:10 +0100)
committerJes Sorensen <jsorensen@fb.com>
Thu, 2 Nov 2017 15:33:09 +0000 (11:33 -0400)
Improve error detection after SG_IO ioctl. Checking only the return
value and response length is insufficient and leads to anomalies if a
drive does not have a serial number.

Reported-by: NeilBrown <neilb@suse.com>
Tested-by: NeilBrown <neilb@suse.com>
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

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