zram: remove unnecessary free

Commit a0c516cbfc74 ("zram: don't grab mutex in zram_slot_free_noity")
introduced pending zram slot free in zram's write path in case of
missing slot free by memory allocation failure in zram_slot_free_notify
but it is not necessary because we have already freed the slot right
before overwriting.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 874e3cddc33f0c0f9cc08ad2b73fa0cbe7dfaa63)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 8b88a8d064aff2e4601b7457367681dcb71b4ca8..a9c236de46767e356c5e962e20989f49b9a44439 100644 (file)
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -440,14 +440,6 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
                goto out;
        }
 
-       /*
-        * zram_slot_free_notify could miss free so that let's
-        * double check.
-        */
-       if (unlikely(meta->table[index].handle ||
-                       zram_test_flag(meta, index, ZRAM_ZERO)))
-               zram_free_page(zram, index);
-
        ret = lzo1x_1_compress(uncmem, PAGE_SIZE, src, &clen,
                               meta->compress_workmem);