Make UART4 the default UART for kernel messages

[linux-beck.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 05b553368bb4f1a6cd10c8adc6c07b2f92c5f3b4..092a2eed1628952e959630e76136d97eee6a7ad5 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -832,7 +832,7 @@ static bool bd_may_claim(struct block_device *bdev, struct block_device *whole,
                return true;     /* already a holder */
        else if (bdev->bd_holder != NULL)
                return false;    /* held by someone else */
-       else if (bdev->bd_contains == bdev)
+       else if (whole == bdev)
                return true;     /* is a whole device which isn't held */
 
        else if (whole->bd_holder == bd_may_claim)
@@ -1950,6 +1950,7 @@ void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg)
        spin_lock(&blockdev_superblock->s_inode_list_lock);
        list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) {
                struct address_space *mapping = inode->i_mapping;
+               struct block_device *bdev;
 
                spin_lock(&inode->i_lock);
                if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW) ||
@@ -1970,8 +1971,12 @@ void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg)
                 */
                iput(old_inode);
                old_inode = inode;
+               bdev = I_BDEV(inode);
 
-               func(I_BDEV(inode), arg);
+               mutex_lock(&bdev->bd_mutex);
+               if (bdev->bd_openers)
+                       func(bdev, arg);
+               mutex_unlock(&bdev->bd_mutex);
 
                spin_lock(&blockdev_superblock->s_inode_list_lock);
        }