If the ses driver receives a UNIT ATTENTION when issuing
a receive diagnostics while probing a SES device, it
fails to attach with messages such as:
scsi 1:0:7:0: Failed to get diagnostic page 0x8000002
scsi 1:0:7:0: Failed to bind enclosure -19
Fix this by eating unit attentions for these commands.
Cc: <stable@xxxxxxxxxxxxxxx>
Suggested-by: Wen Xiong <wenxiong@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Brian King <brking@xxxxxxxxxxxxxxxxxx>
---
drivers/scsi/ses.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff -puN drivers/scsi/ses.c~ses_rcv_diag_retry drivers/scsi/ses.c
--- linux-2.6.git/drivers/scsi/ses.c~ses_rcv_diag_retry 2016-08-25 18:28:18.720565322 -0500
+++ linux-2.6.git-bjking1/drivers/scsi/ses.c 2016-08-25 18:28:29.687496342 -0500
@@ -86,7 +86,7 @@ static void init_device_slot_control(uns
static int ses_recv_diag(struct scsi_device *sdev, int page_code,
void *buf, int bufflen)
{
- int ret;
+ int ret, retries = SES_RETRIES;
unsigned char cmd[] = {
RECEIVE_DIAGNOSTIC,
1, /* Set PCV bit */
@@ -96,11 +96,14 @@ static int ses_recv_diag(struct scsi_dev
0
};
unsigned char recv_page_code;
+ struct scsi_sense_hdr sshdr;
- ret = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
- NULL, SES_TIMEOUT, SES_RETRIES, NULL);
- if (unlikely(!ret))
- return ret;
+ do {
+ memset(&sshdr, 0, sizeof(sshdr));
+ ret = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, bufflen,
+ &sshdr, SES_TIMEOUT, retries, NULL);
+ } while (scsi_sense_valid(&sshdr) &&
+ sshdr.sense_key == UNIT_ATTENTION && --retries);
recv_page_code = ((unsigned char *)buf)[0];
_
--
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