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[SCSI] scsi_dh_alua: Fix Erroneous TPG ID check

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For Target Portal Group IDs occupying the full 2 bytes in the
RTPG response, the following group_id check in the alua_rtpg
routine always fails in scsi_dh_alua.c:

if (h->group_id == (ucp[2] << 8) + ucp[3]) {

This causes the ALUA handler to wrongly identify the AAS of
a specified device as well as incorrectly interpreting the
supported AAS of the target as seen by the following entries
in the /var/log/messages:

"alua: port group 3ea state A supports tousna"
"alua: port group 3e9 state A supports tousna"

This is because 'ucp' is wrongly declared in alua_rtpg as
a character pointer instead of an unsigned character pointer.

Signed-off-by: Martin George <marting@netapp.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Hannes Reinecke 2011-08-24 10:51:18 +02:00 committed by James Bottomley
parent 6bc8d2a0c6
commit cfde3fa166
1 changed files with 1 additions and 1 deletions
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2
drivers/scsi/device_handler/scsi_dh_alua.c
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@ -504,7 +504,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
{
struct scsi_sense_hdr sense_hdr;
int len, k, off, valid_states = 0;
char *ucp;
unsigned char *ucp;
unsigned err;
unsigned long expiry, interval = 10;