diff mbox series

[v4,13/22] zram: use __bio_add_page for adding single page to bio

Message ID 20230420100501.32981-14-jth@kernel.org (mailing list archive)
State Handled Elsewhere, archived
Headers show
Series bio: check return values of bio_add_page | expand

Commit Message

Johannes Thumshirn April 20, 2023, 10:04 a.m. UTC 
From: Johannes Thumshirn <johannes.thumshirn@wdc.com>

The zram writeback code uses bio_add_page() to add a page to a newly
created bio. bio_add_page() can fail, but the return value is never
checked.

Use __bio_add_page() as adding a single page to a newly created bio is
guaranteed to succeed.

This brings us a step closer to marking bio_add_page() as __must_check.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
---
 drivers/block/zram/zram_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Sergey Senozhatsky April 21, 2023, 6:57 a.m. UTC | #1 
+ Minchan

On (23/04/20 12:04), Johannes Thumshirn wrote:
> 
> From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> 
> The zram writeback code uses bio_add_page() to add a page to a newly
> created bio. bio_add_page() can fail, but the return value is never
> checked.
> 
> Use __bio_add_page() as adding a single page to a newly created bio is
> guaranteed to succeed.
> 
> This brings us a step closer to marking bio_add_page() as __must_check.
> 
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
diff mbox series

Patch

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index aa490da3cef2..9179bd0f248c 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -760,7 +760,7 @@  static ssize_t writeback_store(struct device *dev,
 			 REQ_OP_WRITE | REQ_SYNC);
 		bio.bi_iter.bi_sector = blk_idx * (PAGE_SIZE >> 9);
 
-		bio_add_page(&bio, bvec.bv_page, bvec.bv_len,
+		__bio_add_page(&bio, bvec.bv_page, bvec.bv_len,
 				bvec.bv_offset);
 		/*
 		 * XXX: A single page IO would be inefficient for write