linux-kernel - [PATCH 03/25] lightnvm: add check after mempool allocation

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Message-Id: <1452581379-18162-4-git-send-email-m@bjorling.me>
Date:	Tue, 12 Jan 2016 07:49:17 +0100
From:	Matias Bjørling <m@...rling.me>
To:	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...com
Cc:	Javier Gonzalez <javier@...igon.com>,
	Javier Gonzalez <javier@...xlabs.com>,
	Matias Bjørling <m@...rling.me>
Subject: [PATCH 03/25] lightnvm: add check after mempool allocation

From: Javier Gonzalez <javier@...igon.com>

The mempool allocation might fail. Make sure to return error when it
does, instead of causing a kernel panic.

Signed-off-by: Javier Gonzalez <javier@...xlabs.com>
Signed-off-by: Matias Bjørling <m@...rling.me>
---
 drivers/lightnvm/rrpc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index a1e7488..f4bc986 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -287,6 +287,8 @@ static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
 	}
 
 	page = mempool_alloc(rrpc->page_pool, GFP_NOIO);
+	if (!page)
+		return -ENOMEM;
 
 	while ((slot = find_first_zero_bit(rblk->invalid_pages,
 					    nr_pgs_per_blk)) < nr_pgs_per_blk) {
-- 
2.1.4