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From:   Gao Xiang <gaoxiang25@huawei.com>
To:     Chao Yu <yuchao0@huawei.com>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        Christoph Hellwig <hch@infradead.org>,
        Joe Perches <joe@perches.com>,
        "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
        <devel@driverdev.osuosl.org>
CC:     LKML <linux-kernel@vger.kernel.org>,
        <linux-erofs@lists.ozlabs.org>, "Chao Yu" <chao@kernel.org>,
        Miao Xie <miaoxie@huawei.com>, <weidu.du@huawei.com>,
        Fang Wei <fangwei1@huawei.com>,
        Gao Xiang <gaoxiang25@huawei.com>
Subject: [PATCH v2 7/7] erofs: reduntant assignment in __erofs_get_meta_page()
Date:   Fri, 30 Aug 2019 11:00:40 +0800
Message-ID: <20190830030040.10599-7-gaoxiang25@huawei.com>
In-Reply-To: <20190830030040.10599-1-gaoxiang25@huawei.com>
References: <20190830030040.10599-1-gaoxiang25@huawei.com>
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As Joe Perches suggested [1],
 		err = bio_add_page(bio, page, PAGE_SIZE, 0);
-		if (unlikely(err != PAGE_SIZE)) {
+		if (err != PAGE_SIZE) {
 			err = -EFAULT;
 			goto err_out;
 		}

The initial assignment to err is odd as it's not
actually an error value -E<FOO> but a int size
from a unsigned int len.

Here the return is either 0 or PAGE_SIZE.

This would be more legible to me as:

		if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE) {
			err = -EFAULT;
			goto err_out;
		}

[1] https://lore.kernel.org/r/74c4784319b40deabfbaea92468f7e3ef44f1c96.camel@perches.com/
Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
v2: no change, just resend in case of dependency problem;

 fs/erofs/data.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 0f2f1a839372..0983807737fd 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -69,8 +69,7 @@ struct page *__erofs_get_meta_page(struct super_block *sb,
 			goto err_out;
 		}
 
-		err = bio_add_page(bio, page, PAGE_SIZE, 0);
-		if (err != PAGE_SIZE) {
+		if (bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE) {
 			err = -EFAULT;
 			goto err_out;
 		}
-- 
2.17.1