linux-kernel - [PATCH] drdb: don't check for failure from mempool

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Date:   Mon, 10 Apr 2017 12:06:30 +1000
From:   NeilBrown <neilb@...e.com>
To:     Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>
Cc:     drbd-dev@...ts.linbit.com, linux-kernel@...r.kernel.org
Subject: [PATCH] drdb: don't check for failure from mempool_alloc()


mempool_alloc() cannot fail if the gfp flags allow
it to sleep, and GFP_NOIO allows for sleeping.
So drbd_req_new() cannot fail, and drbd_request_prepare() doesn't need
to check if it did.

Signed-off-by: NeilBrown <neilb@...e.com>
---
 drivers/block/drbd/drbd_req.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 652114ae1a8a..2e796f79b324 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -52,8 +52,6 @@ static struct drbd_request *drbd_req_new(struct drbd_device *device, struct bio
 	struct drbd_request *req;
 
 	req = mempool_alloc(drbd_request_mempool, GFP_NOIO);
-	if (!req)
-		return NULL;
 	memset(req, 0, sizeof(*req));
 
 	drbd_req_make_private_bio(req, bio_src);
@@ -1214,15 +1212,6 @@ drbd_request_prepare(struct drbd_device *device, struct bio *bio, unsigned long
 
 	/* allocate outside of all locks; */
 	req = drbd_req_new(device, bio);
-	if (!req) {
-		dec_ap_bio(device);
-		/* only pass the error to the upper layers.
-		 * if user cannot handle io errors, that's not our business. */
-		drbd_err(device, "could not kmalloc() req\n");
-		bio->bi_error = -ENOMEM;
-		bio_endio(bio);
-		return ERR_PTR(-ENOMEM);
-	}
 	req->start_jif = start_jif;
 
 	if (!get_ldev(device)) {
-- 
2.12.2


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