Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Akinobu Mita <akinobu.mita@gmail.com>
To:     linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org
Cc:     Akinobu Mita <akinobu.mita@gmail.com>,
        Johannes Berg <johannes@sipsolutions.net>,
        Keith Busch <keith.busch@intel.com>, Jens Axboe <axboe@fb.com>,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>,
        Minwoo Im <minwoo.im.dev@gmail.com>,
        Kenneth Heitke <kenneth.heitke@intel.com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Subject: [PATCH v4 1/7] devcoredump: use memory_read_from_buffer
Date:   Mon, 20 May 2019 00:06:52 +0900
Message-Id: <1558278418-5702-2-git-send-email-akinobu.mita@gmail.com>
In-Reply-To: <1558278418-5702-1-git-send-email-akinobu.mita@gmail.com>
References: <1558278418-5702-1-git-send-email-akinobu.mita@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Use memory_read_from_buffer() to simplify devcd_readv().

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Minwoo Im <minwoo.im.dev@gmail.com>
Cc: Kenneth Heitke <kenneth.heitke@intel.com>
Cc: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
* v4
- Add Reviewed-by tag

 drivers/base/devcoredump.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/base/devcoredump.c b/drivers/base/devcoredump.c
index f1a3353..3c960a6 100644
--- a/drivers/base/devcoredump.c
+++ b/drivers/base/devcoredump.c
@@ -164,16 +164,7 @@ static struct class devcd_class = {
 static ssize_t devcd_readv(char *buffer, loff_t offset, size_t count,
 			   void *data, size_t datalen)
 {
-	if (offset > datalen)
-		return -EINVAL;
-
-	if (offset + count > datalen)
-		count = datalen - offset;
-
-	if (count)
-		memcpy(buffer, ((u8 *)data) + offset, count);
-
-	return count;
+	return memory_read_from_buffer(buffer, count, &offset, data, datalen);
 }
 
 static void devcd_freev(void *data)
-- 
2.7.4