This patch adds the dynamic match functionality to scsi_dh_rdac driver.
New vendor and product strings are normally not there in the kernel. Whenever
the new product is tested with this driver we see failures during the disco-
very. Without the handler attached, the default scsi mid-level retries would
take effect for certain check-conditions. Default retries(5) are not enough in
some cases(especially with large configuration or huge lun cases).
This patch will send an inquiry if the vendor/product strings are not in the
device list and match with vendor signature.
Signed-off-by: Babu Moger <babu.moger@xxxxxxxxxx>
Reviewed-by: Somasundaram Krishnasamy <Somasundaram.Krishnasamy@xxxxxxxxxx>
---
--- linux-3.4-rc2/drivers/scsi/device_handler/scsi_dh_rdac.c.orig 2012-04-07 20:30:41.000000000 -0500
+++ linux-3.4-rc2/drivers/scsi/device_handler/scsi_dh_rdac.c 2012-04-10 10:48:40.000000000 -0500
@@ -818,7 +818,10 @@ static const struct scsi_dh_devlist rdac
static bool rdac_match(struct scsi_device *sdev)
{
- int i;
+ int i, err;
+ struct c8_inquiry inqp;
+ struct request *rq;
+ struct request_queue *q = sdev->request_queue;
if (scsi_device_tpgs(sdev))
return false;
@@ -831,6 +834,27 @@ static bool rdac_match(struct scsi_devic
return true;
}
}
+
+ /* Now lets try to match the signature on 0xC8 page */
+ memset(&inqp, 0, sizeof(struct c8_inquiry));
+ rq = get_rdac_req(sdev, &inqp, sizeof(struct c8_inquiry), READ);
+ if (!rq)
+ return false;
+
+ rq->cmd[0] = INQUIRY;
+ rq->cmd[1] = 1;
+ rq->cmd[2] = 0xC8;
+ rq->cmd[4] = sizeof(struct c8_inquiry);
+ rq->cmd_len = COMMAND_SIZE(INQUIRY);
+
+ err = blk_execute_rq(q, NULL, rq, 1);
+ blk_put_request(rq);
+ if (err != -EIO) {
+ if (inqp.page_id[0] == 'e' && inqp.page_id[1] == 'd' &&
+ inqp.page_id[2] == 'i' && inqp.page_id[3] == 'd')
+ return true;
+ }
+
return false;
}
--
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