xfs: mark xfs_buf_free as might_sleep()

xfs_buf_free can call vunmap, which can sleep.  The vunmap path is an
unlikely one, so add might_sleep to ensure calling xfs_buf_free from
atomic context gets caught more easily.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 8e7f1b324b3bea132ee93e4ddaa8523fbf17a3a7..1a2b3f06fa717e893a14ff1c9ea3c7c7e127630b 100644 (file)
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -105,6 +105,7 @@ xfs_buf_free(
 {
        unsigned int            size = BBTOB(bp->b_length);
 
+       might_sleep();
        trace_xfs_buf_free(bp, _RET_IP_);
 
        ASSERT(list_empty(&bp->b_lru));