6 files changed, 16 insertions, 10 deletions

diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c
index 2f2ccf686251..a0aabd904a51 100644
--- a/drivers/block/paride/pcd.c
+++ b/drivers/block/paride/pcd.c
@@ -320,6 +320,7 @@ static void pcd_init_units(void)
                 disk->first_minor = unit;
                 strcpy(disk->disk_name, cd->name);      /* umm... */
                 disk->fops = &pcd_bdops;
+                disk->flags = GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
                 disk->events = DISK_EVENT_MEDIA_CHANGE;
         }
 }
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index 4e874c5fa605..ae15a4ddaa9b 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -625,7 +625,8 @@ static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
         blk_queue_max_hw_sectors(q, 4096 / 512);
         gendisk->queue = q;
         gendisk->fops = &viocd_fops;
-        gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
+        gendisk->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE |
+                         GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
         gendisk->events = DISK_EVENT_MEDIA_CHANGE;
         set_capacity(gendisk, 0);
         gendisk->private_data = d;
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index fd1e11799137..6e5123b1d341 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1781,7 +1781,7 @@ static int ide_cd_probe(ide_drive_t *drive)
 
         ide_cd_read_toc(drive, &sense);
         g->fops = &idecd_ops;
-        g->flags |= GENHD_FL_REMOVABLE;
+        g->flags |= GENHD_FL_REMOVABLE | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
         g->events = DISK_EVENT_MEDIA_CHANGE;
         add_disk(g);
         return 0;
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 95019c747cc1..4778e2707168 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -636,7 +636,7 @@ static int sr_probe(struct device *dev)
         disk->first_minor = minor;
         sprintf(disk->disk_name, "sr%d", minor);
         disk->fops = &sr_bdops;
-        disk->flags = GENHD_FL_CD;
+        disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
         disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST;
 
         blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 257b00e98428..d7c2e0fddc6f 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1237,6 +1237,8 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
         res = __blkdev_get(bdev, mode, 0);
 
         if (whole) {
+                struct gendisk *disk = whole->bd_disk;
+
                 /* finish claiming */
                 mutex_lock(&bdev->bd_mutex);
                 spin_lock(&bdev_lock);
@@ -1263,15 +1265,16 @@ int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder)
                 spin_unlock(&bdev_lock);
 
                 /*
-                 * Block event polling for write claims.  Any write
-                 * holder makes the write_holder state stick until all
-                 * are released.  This is good enough and tracking
-                 * individual writeable reference is too fragile given
-                 * the way @mode is used in blkdev_get/put().
+                 * Block event polling for write claims if requested.  Any
+                 * write holder makes the write_holder state stick until
+                 * all are released.  This is good enough and tracking
+                 * individual writeable reference is too fragile given the
+                 * way @mode is used in blkdev_get/put().
                  */
-                if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder) {
+                if ((disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE) &&
+                    !res && (mode & FMODE_WRITE) && !bdev->bd_write_holder) {
                         bdev->bd_write_holder = true;
-                        disk_block_events(bdev->bd_disk);
+                        disk_block_events(disk);
                 }
 
                 mutex_unlock(&bdev->bd_mutex);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index d764a426e9fd..300d7582006e 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -127,6 +127,7 @@ struct hd_struct {
 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
 #define GENHD_FL_EXT_DEVT                       64 /* allow extended devt */
 #define GENHD_FL_NATIVE_CAPACITY                128
+#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE     256
 
 enum {
         DISK_EVENT_MEDIA_CHANGE                 = 1 << 0, /* media changed */