Commands needing to be retried require a complete re-initialization.

The test-unit-ready portion of this patch was causing boots to fail on
my test machine (as in http://lkml.org/lkml/2008/12/5/161). With this
patch in place, the system is booting reliably.

Mike Anderson found the same problem in the hp_hw_start_stop code,
and I applied the same solution in cdrom_read_cdda_bpc.

Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
Cc: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index d16b02423d61..7d2e91cccb13 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2081,10 +2081,6 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
         if (!q)
                 return -ENXIO;
 
-        rq = blk_get_request(q, READ, GFP_KERNEL);
-        if (!rq)
-                return -ENOMEM;
-
         cdi->last_sense = 0;
 
         while (nframes) {
@@ -2096,9 +2092,17 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
 
                 len = nr * CD_FRAMESIZE_RAW;
 
+                rq = blk_get_request(q, READ, GFP_KERNEL);
+                if (!rq) {
+                        ret = -ENOMEM;
+                        break;
+                }
+
                 ret = blk_rq_map_user(q, rq, NULL, ubuf, len, GFP_KERNEL);
-                if (ret)
+                if (ret) {
+                        blk_put_request(rq);
                         break;
+                }
 
                 rq->cmd[0] = GPCMD_READ_CD;
                 rq->cmd[1] = 1 << 2;
@@ -2124,6 +2128,7 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
 
                 if (blk_rq_unmap_user(bio))
                         ret = -EFAULT;
+                blk_put_request(rq);
 
                 if (ret)
                         break;
@@ -2133,7 +2138,6 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
                 ubuf += len;
         }
 
-        blk_put_request(rq);
         return ret;
 }