[SCSI] sr: fix test unit ready responses

Commit 210ba1d1724f5c4ed87a2ab1a21ca861a915f734 updated sr.c to use
the scsi_test_unit_ready() function.  Unfortunately, this has the
wrong characteristic of eating NOT_READY returns which sr.c relies on
for tray status.

Fix by rolling an internal sr_test_unit_ready() that doesn't do this.

Tested-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 50ba492..208565b 100644 (file)
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -163,6 +163,29 @@ static void scsi_cd_put(struct scsi_cd *cd)
        mutex_unlock(&sr_ref_mutex);
 }
 
+/* identical to scsi_test_unit_ready except that it doesn't
+ * eat the NOT_READY returns for removable media */
+int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr)
+{
+       int retries = MAX_RETRIES;
+       int the_result;
+       u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 };
+
+       /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
+        * conditions are gone, or a timeout happens
+        */
+       do {
+               the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL,
+                                             0, sshdr, SR_TIMEOUT,
+                                             retries--);
+
+       } while (retries > 0 &&
+                (!scsi_status_is_good(the_result) ||
+                 (scsi_sense_valid(sshdr) &&
+                  sshdr->sense_key == UNIT_ATTENTION)));
+       return the_result;
+}
+
 /*
  * This function checks to see if the media has been changed in the
  * CDROM drive.  It is possible that we have already sensed a change,
@@ -185,8 +208,7 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot)
        }
 
        sshdr =  kzalloc(sizeof(*sshdr), GFP_KERNEL);
-       retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES,
-                                     sshdr);
+       retval = sr_test_unit_ready(cd->device, sshdr);
        if (retval || (scsi_sense_valid(sshdr) &&
                       /* 0x3a is medium not present */
                       sshdr->asc == 0x3a)) {
@@ -733,10 +755,8 @@ static void get_capabilities(struct scsi_cd *cd)
 {
        unsigned char *buffer;
        struct scsi_mode_data data;
-       unsigned char cmd[MAX_COMMAND_SIZE];
        struct scsi_sense_hdr sshdr;
-       unsigned int the_result;
-       int retries, rc, n;
+       int rc, n;
 
        static const char *loadmech[] =
        {
@@ -758,23 +778,8 @@ static void get_capabilities(struct scsi_cd *cd)
                return;
        }
 
-       /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION
-        * conditions are gone, or a timeout happens
-        */
-       retries = 0;
-       do {
-               memset((void *)cmd, 0, MAX_COMMAND_SIZE);
-               cmd[0] = TEST_UNIT_READY;
-
-               the_result = scsi_execute_req (cd->device, cmd, DMA_NONE, NULL,
-                                              0, &sshdr, SR_TIMEOUT,
-                                              MAX_RETRIES);
-
-               retries++;
-       } while (retries < 5 && 
-                (!scsi_status_is_good(the_result) ||
-                 (scsi_sense_valid(&sshdr) &&
-                  sshdr.sense_key == UNIT_ATTENTION)));
+       /* eat unit attentions */
+       sr_test_unit_ready(cd->device, &sshdr);
 
        /* ask for mode page 0x2a */
        rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128,

diff --git a/drivers/scsi/sr.h b/drivers/scsi/sr.h
index 81fbc0b..1e144df 100644 (file)
--- a/drivers/scsi/sr.h
+++ b/drivers/scsi/sr.h
@@ -61,6 +61,7 @@ int sr_select_speed(struct cdrom_device_info *cdi, int speed);
 int sr_audio_ioctl(struct cdrom_device_info *, unsigned int, void *);
 
 int sr_is_xa(Scsi_CD *);
+int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr);
 
 /* sr_vendor.c */
 void sr_vendor_init(Scsi_CD *);

diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c
index d5cebff..ae87d08 100644 (file)
--- a/drivers/scsi/sr_ioctl.c
+++ b/drivers/scsi/sr_ioctl.c
@@ -306,8 +306,7 @@ int sr_drive_status(struct cdrom_device_info *cdi, int slot)
                /* we have no changer support */
                return -EINVAL;
        }
-       if (0 == scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES,
-                                     &sshdr))
+       if (0 == sr_test_unit_ready(cd->device, &sshdr))
                return CDS_DISC_OK;
 
        if (!cdrom_get_media_event(cdi, &med)) {