[Ubuntu PATCH] CDROMEJECT cannot eject some devices

[Randy Dunlap <randy.dunlap@oracle.com>]

Fix the bug where CDROMEJECT cannot eject some devices.

bug discussion: https://bugzilla.ubuntu.com/show_bug.cgi?id=5049

Patch location:
http://www.kernel.org/git/?p=linux/kernel/git/bcollins/ubuntu-dapper.git;a=commitdiff;h=f431f87fc9ac9ba248f43662ef9da9cdaa3418c2

---
 block/scsi_ioctl.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- linux-2617-g21.orig/block/scsi_ioctl.c
+++ linux-2617-g21/block/scsi_ioctl.c
@@ -501,7 +501,7 @@ static int __blk_send_generic(request_qu
 	struct request *rq;
 	int err;
 
-	rq = blk_get_request(q, WRITE, __GFP_WAIT);
+	rq = blk_get_request(q, READ, __GFP_WAIT);
 	rq->flags |= REQ_BLOCK_PC;
 	rq->data = NULL;
 	rq->data_len = 0;
@@ -521,6 +521,11 @@ static inline int blk_send_start_stop(re
 	return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 }
 
+static inline int blk_send_allow_medium_removal(request_queue_t *q, struct gendisk *bd_disk)
+{
+	return __blk_send_generic(q, bd_disk, GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, 0);
+}
+
 int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
 {
 	request_queue_t *q;
@@ -645,7 +650,11 @@ int scsi_cmd_ioctl(struct file *file, st
 			err = blk_send_start_stop(q, bd_disk, 0x03);
 			break;
 		case CDROMEJECT:
-			err = blk_send_start_stop(q, bd_disk, 0x02);
+			err = 0;
+
+			err |= blk_send_allow_medium_removal(q, bd_disk);
+			err |= blk_send_start_stop(q, bd_disk, 0x01);
+			err |= blk_send_start_stop(q, bd_disk, 0x02);
 			break;
 		default:
 			err = -ENOTTY;