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_read_nnode
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..4247934c 100644
--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -1205,7 +1205,7 @@ int ubifs_read_nnode(struct ubifs_info *c, struct
ubifs_nnode *parent, int iip)
lnum = c->lpt_lnum;
offs = c->lpt_offs;
}
- nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_NOFS);
+ nnode = kzalloc(sizeof(struct ubifs_nnode), GFP_ATOMIC);
if (!nnode) {
err = -ENOMEM;
goto out;
--
1.7.9.5
