linux-kernel - [PATCH] zram: fix zram_bvec_read duplicate dump failure message and stat accumulation

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Message-Id: <1363158376-20954-1-git-send-email-liwanp@linux.vnet.ibm.com>
Date:	Wed, 13 Mar 2013 15:06:16 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: [PATCH] zram: fix zram_bvec_read duplicate dump failure message and stat accumulation

When zram decompress fails, the code unnecessarily dumps failure messages and
does stat accumulation in function zram_decompress_page(), this work is already 
done in function zram_decompress_page, the patch skips the redundant work.

Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
 drivers/staging/zram/zram_drv.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 5918fd7..e34e3fe 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -207,11 +207,8 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
 
 	ret = zram_decompress_page(zram, uncmem, index);
 	/* Should NEVER happen. Return bio error if it does. */
-	if (unlikely(ret != LZO_E_OK)) {
-		pr_err("Decompression failed! err=%d, page=%u\n", ret, index);
-		zram_stat64_inc(zram, &zram->stats.failed_reads);
+	if (unlikely(ret != LZO_E_OK))
 		goto out_cleanup;
-	}
 
 	if (is_partial_io(bvec))
 		memcpy(user_mem + bvec->bv_offset, uncmem + offset,
-- 
1.7.11.7

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