[PATCH] staging: exfat: Use kvzalloc() instead of kzalloc() for exfat_sb_info

jiayeli jiayeli at synology.com
Wed Sep 25 08:37:29 UTC 2019

From: Jia-Ye Li <jiayeli at synology.com>

Fix mount failed "Cannot allocate memory".

When the memory gets fragmented, kzalloc() might fail to allocate
physically contiguous pages for the struct exfat_sb_info (its size is
about 34KiB) even the total free memory is enough.
Use kvzalloc() to solve this problem.

Reviewed-by: Ethan Wu <ethanwu at synology.com>
Signed-off-by: Jia-Ye Li <jiayeli at synology.com>
 drivers/staging/exfat/exfat_super.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/exfat/exfat_super.c b/drivers/staging/exfat/exfat_super.c
index 5f6caee819a6..bfad2a6bbcb3 100644
--- a/drivers/staging/exfat/exfat_super.c
+++ b/drivers/staging/exfat/exfat_super.c
@@ -7,6 +7,7 @@
 #include <linux/init.h>
 #include <linux/time.h>
 #include <linux/slab.h>
+#include <linux/mm.h>
 #include <linux/seq_file.h>
 #include <linux/pagemap.h>
 #include <linux/mpage.h>
@@ -3450,7 +3451,7 @@ static void exfat_free_super(struct exfat_sb_info *sbi)
 	/* mutex_init is in exfat_fill_super function. only for 3.7+ */
-	kfree(sbi);
+	kvfree(sbi);
 static void exfat_put_super(struct super_block *sb)
@@ -3845,7 +3846,7 @@ static int exfat_fill_super(struct super_block *sb, void *data, int silent)
 	 * the filesystem, since we're only just about to mount
 	 * it and have no inodes etc active!
-	sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL);
+	sbi = kvzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
 		return -ENOMEM;

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