UBI: allocate memory with GFP_NOFS

Use GFP_NOFS flag when allocating memory on I/O path, because otherwise
we may deadlock the filesystem which works on top of us. We observed
the deadlocks with UBIFS. Example:

VFS->FS lock a lock->UBI->kmalloc()->VFS writeback->FS locks the same
lock again.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index 18c347b24e27..1c1401d6958b 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -323,7 +323,7 @@ static int compare_lebs(const struct ubi_device *ubi,
         } else {
                 pnum = seb->pnum;
 
-                vh = ubi_zalloc_vid_hdr(ubi);
+                vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
                 if (!vh)
                         return -ENOMEM;
 
@@ -948,7 +948,7 @@ struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
         if (!ech)
                 goto out_si;
 
-        vidh = ubi_zalloc_vid_hdr(ubi);
+        vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
         if (!vidh)
                 goto out_ech;