Message ID | 1435934443-17090-7-git-send-email-matthew.r.wilcox@intel.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
diff --git a/fs/block_dev.c b/fs/block_dev.c index 0bb2993..1982437 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -446,6 +446,12 @@ 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. + */ + might_sleep(); + if (size < 0) return size; if (!ops->direct_access)
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: Matthew Wilcox <matthew.r.wilcox@intel.com> --- fs/block_dev.c | 6 ++++++ 1 file changed, 6 insertions(+)