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* [PATCH] zram: fix error return codes not being returned in writeback_store
@ 2019-11-28 12:29 Colin King
  2019-12-04  1:16 ` Minchan Kim
  0 siblings, 1 reply; 2+ messages in thread
From: Colin King @ 2019-11-28 12:29 UTC (permalink / raw)
  To: Minchan Kim, Nitin Gupta, Sergey Senozhatsky, Jens Axboe, linux-kernel
  Cc: kernel-janitors, linux-block

From: Colin Ian King <>

Currently when an error code -EIO or -ENOSPC in the for-loop of
writeback_store the error code is being overwritten by a ret = len
assignment at the end of the function and the error codes are being
lost.  Fix this by assigning ret = len at the start of the function
and remove the assignment from the end, hence allowing ret to be
preserved when error codes are assigned to it.

Addresses-Coverity: ("Unused value")
Fixes: a939888ec38b ("zram: support idle/huge page writeback")
Signed-off-by: Colin Ian King <>
 drivers/block/zram/zram_drv.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 4285e75e52c3..1bf4a908a0bd 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -626,7 +626,7 @@ static ssize_t writeback_store(struct device *dev,
 	struct bio bio;
 	struct bio_vec bio_vec;
 	struct page *page;
-	ssize_t ret;
+	ssize_t ret = len;
 	int mode;
 	unsigned long blk_idx = 0;
@@ -762,7 +762,6 @@ static ssize_t writeback_store(struct device *dev,
 	if (blk_idx)
 		free_block_bdev(zram, blk_idx);
-	ret = len;

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2019-11-28 12:29 [PATCH] zram: fix error return codes not being returned in writeback_store Colin King
2019-12-04  1:16 ` Minchan Kim

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