The driver may sleep under a rcu read lock, and function call path is:
nfs_permission (acquire the lock by rcu_read_lock)
nfs_do_access
nfs_access_add_cache
kmalloc(GFP_KERNEL) --> may sleep
To fix it, "GFP_KERNEL" is replaced with "GFP_ATOMIC".
Signed-off-by: Jia-Ju Bai <[email protected]>
---
fs/nfs/dir.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 32ccd77..7a074db 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2333,7 +2333,7 @@ static void nfs_access_add_rbtree(struct inode *inode,
struct nfs_access_entry *
void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
{
- struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL);
+ struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_ATOMIC);
if (cache == NULL)
return;
RB_CLEAR_NODE(&cache->rb_node);
--
1.7.9.5
