From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DA47EAD23 for ; Thu, 27 Oct 2022 17:07:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5CB8AC433C1; Thu, 27 Oct 2022 17:07:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666890458; bh=/5DiX3fzDhxiCvwaypMTm5GNdUQ/9JXxBImOGAswOyw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ESRp6sUdeFVMFGlPmGmueABXGowwcvkc6dKbK9k2JqV0ejwRtWmOHRet42UqooSmo GYK9Ed1BB/Iwj3v8R+O3XnkEfeCJ+tZIojpujswGE2u9DTHpe3wTfyXz8LXLLzv6rJ V+DcrZxAvKnb3vWVOmYbDEmeR1NtPjIbioYafI+k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, kernel test robot , Yu Kuai , Ming Lei , Jens Axboe Subject: [PATCH 5.10 78/79] blk-wbt: fix that rwb->wc is always set to 1 in wbt_init() Date: Thu, 27 Oct 2022 18:56:28 +0200 Message-Id: <20221027165056.972279568@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221027165054.270676357@linuxfoundation.org> References: <20221027165054.270676357@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Yu Kuai commit 285febabac4a16655372d23ff43e89ff6f216691 upstream. commit 8c5035dfbb94 ("blk-wbt: call rq_qos_add() after wb_normal is initialized") moves wbt_set_write_cache() before rq_qos_add(), which is wrong because wbt_rq_qos() is still NULL. Fix the problem by removing wbt_set_write_cache() and setting 'rwb->wc' directly. Noted that this patch also remove the redundant setting of 'rab->wc'. Fixes: 8c5035dfbb94 ("blk-wbt: call rq_qos_add() after wb_normal is initialized") Reported-by: kernel test robot Link: https://lore.kernel.org/r/202210081045.77ddf59b-yujie.liu@intel.com Signed-off-by: Yu Kuai Reviewed-by: Ming Lei Link: https://lore.kernel.org/r/20221009101038.1692875-1-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-wbt.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/block/blk-wbt.c +++ b/block/blk-wbt.c @@ -838,12 +838,11 @@ int wbt_init(struct request_queue *q) rwb->last_comp = rwb->last_issue = jiffies; rwb->win_nsec = RWB_WINDOW_NSEC; rwb->enable_state = WBT_STATE_ON_DEFAULT; - rwb->wc = 1; + rwb->wc = test_bit(QUEUE_FLAG_WC, &q->queue_flags); rwb->rq_depth.default_depth = RWB_DEF_DEPTH; rwb->min_lat_nsec = wbt_default_latency_nsec(q); wbt_queue_depth_changed(&rwb->rqos); - wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags)); /* * Assign rwb and add the stats callback.