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From: "André Almeida" <andrealmeid@collabora.com>
To: linux-block@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: corbet@lwn.net, axboe@kernel.dk, kernel@collabora.com,
	krisman@collabora.com,
	"André Almeida" <andrealmeid@collabora.com>
Subject: [PATCH 1/4] null_blk: do not fail the module load with zero devices
Date: Fri, 13 Sep 2019 15:57:43 -0300
Message-ID: <20190913185746.337429-2-andrealmeid@collabora.com> (raw)
In-Reply-To: <20190913185746.337429-1-andrealmeid@collabora.com>

The module load should fail only if there is something wrong with the
configuration or if an error prevents it to work properly. The module
should be able to be loaded with (nr_device == 0), since it will not
trigger errors or be in malfunction state. Preventing loading with zero
devices also breaks applications that configures this module using
configfs API. Remove the nr_device check to fix this.

Signed-off-by: André Almeida <andrealmeid@collabora.com>
Fixes: f7c4ce890dd2 ("null_blk: validate the number of devices")
---
 drivers/block/null_blk_main.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index ab4b87677139..be32cb5ed339 100644
--- a/drivers/block/null_blk_main.c
+++ b/drivers/block/null_blk_main.c
@@ -1758,10 +1758,6 @@ static int __init null_init(void)
 		pr_err("null_blk: legacy IO path no longer available\n");
 		return -EINVAL;
 	}
-	if (!nr_devices) {
-		pr_err("null_blk: invalid number of devices\n");
-		return -EINVAL;
-	}
 	if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) {
 		if (g_submit_queues != nr_online_nodes) {
 			pr_warn("null_blk: submit_queues param is set to %u.\n",
-- 
2.23.0


  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-13 18:57 [PATCH 0/4] null_blk: fixes around nr_devices and log improvements André Almeida
2019-09-13 18:57 ` André Almeida [this message]
2019-09-13 18:57 ` [PATCH 2/4] null_blk: match the type of parameter nr_devices André Almeida
2019-09-13 18:57 ` [PATCH 3/4] null_blk: format pr_* logs with pr_fmt André Almeida
2019-09-13 20:18   ` Chaitanya Kulkarni
2019-09-13 18:57 ` [PATCH 4/4] coding-style: add explanation about pr_fmt macro André Almeida
2019-09-13 19:08   ` Joe Perches
2019-09-13 19:36     ` André Almeida
2019-09-13 20:22   ` Bart Van Assche
2019-09-14  7:08     ` Jonathan Corbet
2019-09-13 19:03 ` [PATCH 0/4] null_blk: fixes around nr_devices and log improvements Jens Axboe
2019-09-13 19:22   ` André Almeida
2019-09-13 20:50     ` Jens Axboe

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