The driver may sleep under a spin lock, and the function call path is: ubifs_change_lp (acquire the lock by spin_lock) change_category ubifs_remove_from_cat remove_from_lpt_heap dbg_check_heap ubifs_lpt_lookup ubifs_get_pnode read_pnode kzalloc(GFP_NOFS) --> may sleep
To fix it, "GFP_NOFS" is replaced with "GFP_ATOMIC". Signed-off-by: Jia-Ju Bai <baijiaju1...@163.com> --- fs/ubifs/lpt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c index 9a51710..fabe2fd 100644 --- a/fs/ubifs/lpt.c +++ b/fs/ubifs/lpt.c @@ -1268,7 +1268,7 @@ static int read_pnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip) branch = &parent->nbranch[iip]; lnum = branch->lnum; offs = branch->offs; - pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_NOFS); + pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_ATOMIC); if (!pnode) return -ENOMEM; -- 1.7.9.5