Commit 43c3dd08 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Al Viro

dax: bdev_direct_access() may sleep

The brd driver is the only in-tree driver that may sleep currently.
After some discussion on linux-fsdevel, we decided that any driver
may choose to sleep in its ->direct_access method.  To ensure that all
callers of bdev_direct_access() are prepared for this, add a call
to might_sleep().
Signed-off-by: default avatarMatthew Wilcox <>
Signed-off-by: default avatarAl Viro <>
parent bbab37dd
......@@ -445,6 +445,12 @@ long bdev_direct_access(struct block_device *bdev, sector_t sector,
long avail;
const struct block_device_operations *ops = bdev->bd_disk->fops;
* The device driver is allowed to sleep, in order to make the
* memory directly accessible.
if (size < 0)
return size;
if (!ops->direct_access)
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