[SCSI] sr: update to follow tray status correctly

Based on an original patch from: David Martin <tasio@tasio.net>

When trying to get the drive status via ioctl CDROM_DRIVE_STATUS, with
no disk it gives CDS_TRAY_OPEN even if the tray is closed.

ioctl works as expected with ide-cd driver.

Gentoo bug report: http://bugs.gentoo.org/show_bug.cgi?id=196879

Cc: Maarten Bressers <mbres@gentoo.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

3 files changed, 37 insertions, 16 deletions

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 896be4ab285..1fcee16fa36 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -67,8 +67,6 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
 
 #define SR_DISKS        256
 
-#define MAX_RETRIES     3
-#define SR_TIMEOUT      (30 * HZ)
 #define SR_CAPABILITIES \
         (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \
          CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \
diff --git a/drivers/scsi/sr.h b/drivers/scsi/sr.h
index 0d04e2878c9..81fbc0b78a5 100644
--- a/drivers/scsi/sr.h
+++ b/drivers/scsi/sr.h
@@ -20,6 +20,9 @@
 #include <linux/genhd.h>
 #include <linux/kref.h>
 
+#define MAX_RETRIES     3
+#define SR_TIMEOUT      (30 * HZ)
+
 struct scsi_device;
 
 /* The CDROM is fairly slow, so we need a little extra time */
diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c
index e1589f91706..d5cebff1d64 100644
--- a/drivers/scsi/sr_ioctl.c
+++ b/drivers/scsi/sr_ioctl.c
@@ -275,18 +275,6 @@ int sr_do_ioctl(Scsi_CD *cd, struct packet_command *cgc)
 /* ---------------------------------------------------------------------- */
 /* interface to cdrom.c                                                   */
 
-static int test_unit_ready(Scsi_CD *cd)
-{
-        struct packet_command cgc;
-
-        memset(&cgc, 0, sizeof(struct packet_command));
-        cgc.cmd[0] = GPCMD_TEST_UNIT_READY;
-        cgc.quiet = 1;
-        cgc.data_direction = DMA_NONE;
-        cgc.timeout = IOCTL_TIMEOUT;
-        return sr_do_ioctl(cd, &cgc);
-}
-
 int sr_tray_move(struct cdrom_device_info *cdi, int pos)
 {
         Scsi_CD *cd = cdi->handle;
@@ -310,14 +298,46 @@ int sr_lock_door(struct cdrom_device_info *cdi, int lock)
 
 int sr_drive_status(struct cdrom_device_info *cdi, int slot)
 {
+        struct scsi_cd *cd = cdi->handle;
+        struct scsi_sense_hdr sshdr;
+        struct media_event_desc med;
+
         if (CDSL_CURRENT != slot) {
                 /* we have no changer support */
                 return -EINVAL;
         }
-        if (0 == test_unit_ready(cdi->handle))
+        if (0 == scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES,
+                                      &sshdr))
                 return CDS_DISC_OK;
 
-        return CDS_TRAY_OPEN;
+        if (!cdrom_get_media_event(cdi, &med)) {
+                if (med.media_present)
+                        return CDS_DISC_OK;
+                else if (med.door_open)
+                        return CDS_TRAY_OPEN;
+                else
+                        return CDS_NO_DISC;
+        }
+
+        /*
+         * 0x04 is format in progress .. but there must be a disc present!
+         */
+        if (sshdr.sense_key == NOT_READY && sshdr.asc == 0x04)
+                return CDS_DISC_OK;
+
+        /*
+         * If not using Mt Fuji extended media tray reports,
+         * just return TRAY_OPEN since ATAPI doesn't provide
+         * any other way to detect this...
+         */
+        if (scsi_sense_valid(&sshdr) &&
+            /* 0x3a is medium not present */
+            sshdr.asc == 0x3a)
+                return CDS_NO_DISC;
+        else
+                return CDS_TRAY_OPEN;
+
+        return CDS_DRIVE_NOT_READY;
 }
 
 int sr_disk_status(struct cdrom_device_info *cdi)