Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752697AbaKZUji (ORCPT ); Wed, 26 Nov 2014 15:39:38 -0500 Received: from mail-la0-f48.google.com ([209.85.215.48]:49781 "EHLO mail-la0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750793AbaKZUjg (ORCPT ); Wed, 26 Nov 2014 15:39:36 -0500 From: =?UTF-8?q?Matias=20Bj=C3=B8rling?= To: axboe@kernel.dk, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Matias=20Bj=C3=B8rling?= Subject: [PATCH v2] null_blk: boundary check queue_mode and irqmode Date: Wed, 26 Nov 2014 21:39:24 +0100 Message-Id: <1417034364-2841-1-git-send-email-m@bjorling.me> X-Mailer: git-send-email 2.1.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When either queue_mode or irq_mode parameter is set outside its boundaries, the driver will not complete requests. This stalls driver initialization when partitions are probed. Fix by setting out of bound values to the parameters default. Signed-off-by: Matias Bjørling --- drivers/block/null_blk.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 56 insertions(+), 2 deletions(-) diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index 8001e81..9b865ed 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -78,7 +78,34 @@ module_param(home_node, int, S_IRUGO); MODULE_PARM_DESC(home_node, "Home node for the device"); static int queue_mode = NULL_Q_MQ; -module_param(queue_mode, int, S_IRUGO); + +static int null_set_queue_mode(const char *val, const struct kernel_param *kp) +{ + int ret, new_queue_mode; + + ret = kstrtoint(val, 10, &new_queue_mode); + if (ret) + goto fail; + + if (new_queue_mode < 0 || new_queue_mode > 2) { + ret = -EINVAL; + goto fail; + } + + queue_mode = new_queue_mode; + + return 0; +fail: + pr_warn("null_blk: defaults queue_mode to multiqueue\n"); + return ret; +} + +static struct kernel_param_ops null_queue_mode_param_ops = { + .set = null_set_queue_mode, + .get = param_get_int, +}; + +device_param_cb(queue_mode, &null_queue_mode_param_ops, &queue_mode, S_IRUGO); MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)"); static int gb = 250; @@ -94,7 +121,34 @@ module_param(nr_devices, int, S_IRUGO); MODULE_PARM_DESC(nr_devices, "Number of devices to register"); static int irqmode = NULL_IRQ_SOFTIRQ; -module_param(irqmode, int, S_IRUGO); + +static int null_set_irqmode(const char *val, const struct kernel_param *kp) +{ + int ret, new_irqmode; + + ret = kstrtoint(val, 10, &new_irqmode); + if (ret) + goto fail; + + if (new_irqmode < 0 || new_irqmode > 2) { + ret = -EINVAL; + goto fail; + } + + irqmode = new_irqmode; + + return 0; +fail: + pr_warn("null_blk: defaults to irqmode to softirq\n"); + return ret; +} + +static struct kernel_param_ops null_irqmode_param_ops = { + .set = null_set_irqmode, + .get = param_get_int, +}; + +device_param_cb(irqmode, &null_irqmode_param_ops, &irqmode, S_IRUGO); MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer"); static int completion_nsec = 10000; -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/