[PATCH 2/7] zram: delay pending free request in read path

[Minchan Kim]

Sergey Senozhatsky reporetd we don't need to handle pending free
request every I/O so that this patch removes it in read path while
we remain it in write path.

Let's consider below example.

Swap subsystem ask to zram "A" block free by swap_slot_free_notify
but zram had been pended it without real freeing.
Swap subsystem allocates "A" block for new data but request pended
for a long time just handled and zram blindly free new data on
the "A" block. :(

That's why we couldn't remove handle pending free request right before
zram-write.

Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
---
 drivers/block/zram/zram_drv.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 213dfc1..d87c7e9 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -535,7 +535,6 @@ static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
 
 	if (rw == READ) {
 		down_read(&zram->lock);
-		handle_pending_slot_free(zram);
 		ret = zram_bvec_read(zram, bvec, index, offset, bio);
 		up_read(&zram->lock);
 	} else {
-- 
1.8.4.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/