[PATCH v2 1/7] devcoredump: use memory_read_from_buffer

From: Akinobu Mita
Date: Tue May 07 2019 - 12:59:47 EST


Use memory_read_from_buffer() to simplify devcd_readv().

Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: Minwoo Im <minwoo.im.dev@xxxxxxxxx>
Reviewed-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
---
* v2
- 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