linux-kernel - [PATCH 1/2] devcoredump: use memory_read_from

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Message-Id: <1564243146-5681-2-git-send-email-akinobu.mita@gmail.com>
Date:   Sun, 28 Jul 2019 00:59:05 +0900
From:   Akinobu Mita <akinobu.mita@...il.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Cc:     Akinobu Mita <akinobu.mita@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        Keith Busch <keith.busch@...el.com>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Kenneth Heitke <kenneth.heitke@...el.com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
Subject: [PATCH 1/2] devcoredump: use memory_read_from_buffer

Use memory_read_from_buffer() to simplify devcd_readv().

Cc: Johannes Berg <johannes@...solutions.net>
Cc: Keith Busch <keith.busch@...el.com>
Cc: Jens Axboe <axboe@...com>
Cc: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>
Cc: Minwoo Im <minwoo.im.dev@...il.com>
Cc: Kenneth Heitke <kenneth.heitke@...el.com>
Cc: Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
Reviewed-by: Johannes Berg <johannes@...solutions.net>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
---
 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