[SCSI] sd,sr: add early detection of medium not present

The current scsi_test_unit_ready() is updated to return sense code
information (in struct scsi_sense_hdr).  The sd and sr drivers are
changed to interpret the sense code return asc 0x3a as no media and
adjust the device status accordingly.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 18343a6acd8e..212f6bcfd457 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -736,6 +736,7 @@ static int sd_media_changed(struct gendisk *disk)
 {
         struct scsi_disk *sdkp = scsi_disk(disk);
         struct scsi_device *sdp = sdkp->device;
+        struct scsi_sense_hdr *sshdr = NULL;
         int retval;
 
         SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
@@ -766,8 +767,11 @@ static int sd_media_changed(struct gendisk *disk)
          */
         retval = -ENODEV;
 
-        if (scsi_block_when_processing_errors(sdp))
-                retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES);
+        if (scsi_block_when_processing_errors(sdp)) {
+                sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
+                retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
+                                              sshdr);
+        }
 
         /*
          * Unable to test, unit probably not ready.   This usually
@@ -775,7 +779,9 @@ static int sd_media_changed(struct gendisk *disk)
          * and we will figure it out later once the drive is
          * available again.
          */
-        if (retval) {
+        if (retval || (scsi_sense_valid(sshdr) &&
+                       /* 0x3a is medium not present */
+                       sshdr->asc == 0x3a)) {
                 set_media_not_present(sdkp);
                 retval = 1;
                 goto out;
@@ -794,6 +800,7 @@ out:
         if (retval != sdkp->previous_state)
                 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
         sdkp->previous_state = retval;
+        kfree(sshdr);
         return retval;
 }