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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-12-04 21:21:46 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-12-29 12:24:24 -0500
commit5cd3bbfad088f86bde3e0f038ff4dd5bb0ac5290 (patch)
tree090f7dee647162251397a8378a01454390a02bcd /drivers/scsi/scsi_scan.c
parentf4f4e47e4af6b02dd1c425b931c65d0165356e33 (diff)
[SCSI] retry with missing data for INQUIRY
This patch changes scsi_probe_lun() to retry INQUIRY if the device has not actually sent back any INQUIRY data, This enables the Thecus N2050 storage device to work better. The firmware on that device starts up strangely; it sends no data in response to the initial INQUIRY, and it sends the INQUIRY information in response to the followup REQUEST SENSE. But after that it works better, so retrying the INQUIRY is enough to get it going. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
-rw-r--r--drivers/scsi/scsi_scan.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 6963d529e0f0..18486b51668d 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -573,6 +573,8 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
573 573
574 /* Each pass gets up to three chances to ignore Unit Attention */ 574 /* Each pass gets up to three chances to ignore Unit Attention */
575 for (count = 0; count < 3; ++count) { 575 for (count = 0; count < 3; ++count) {
576 int resid;
577
576 memset(scsi_cmd, 0, 6); 578 memset(scsi_cmd, 0, 6);
577 scsi_cmd[0] = INQUIRY; 579 scsi_cmd[0] = INQUIRY;
578 scsi_cmd[4] = (unsigned char) try_inquiry_len; 580 scsi_cmd[4] = (unsigned char) try_inquiry_len;
@@ -582,7 +584,7 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
582 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, 584 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
583 inq_result, try_inquiry_len, &sshdr, 585 inq_result, try_inquiry_len, &sshdr,
584 HZ / 2 + HZ * scsi_inq_timeout, 3, 586 HZ / 2 + HZ * scsi_inq_timeout, 3,
585 NULL); 587 &resid);
586 588
587 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " 589 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
588 "with code 0x%x\n", 590 "with code 0x%x\n",
@@ -603,6 +605,14 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
603 (sshdr.ascq == 0)) 605 (sshdr.ascq == 0))
604 continue; 606 continue;
605 } 607 }
608 } else {
609 /*
610 * if nothing was transferred, we try
611 * again. It's a workaround for some USB
612 * devices.
613 */
614 if (resid == try_inquiry_len)
615 continue;
606 } 616 }
607 break; 617 break;
608 } 618 }