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Subject[PATCH] block: return specific error when pointer is NULL
Date
From: Wang Qing <wangqing@vivo.com>

loop_attr_backing_file_show() better return specific error than 0
when pointer is NULL

Signed-off-by: Wang Qing <wangqing@vivo.com>
---
drivers/block/loop.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index e52a8a5..860a5b6
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -667,7 +667,7 @@ static ssize_t loop_attr_backing_file_show(struct loop_device *lo, char *buf)
spin_unlock_irq(&lo->lo_lock);

if (IS_ERR_OR_NULL(p))
- ret = PTR_ERR(p);
+ ret = p ? PTR_ERR(p) : -ENOENT;
else {
ret = strlen(p);
memmove(buf, p, ret);
--
2.7.4
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