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 277322F0C7F; Fri, 9 Jan 2026 12:13:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767960825; cv=none; b=NupaAaMReLRnNK1WyrGBrwYopagCkQ/f6yIogEfU0GntWNE7IGVqGD6KwL4bHWtf+pZEj+JV+j74JpNGsoEk99AHUies+Vm1qgAraSGgXkQBjwiebiUV6FMjlEkrnDd/Wo3JktTHVoEV8O7r0XXeTDHonqUVwZRXB9A44gV7u0k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767960825; c=relaxed/simple; bh=HhdNFjcHWiMWXAw6o+8KOn8sEdDLS5BbWXrkGJLn2cU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=p6KLuHLEisHalxvXnmwX7cc3wT31BGc92GHlSLrN0PfJbeF2iZdO3aQ1bzxQZVqEcjzq2ot7xYxnYXj6KVZ5hml4MxMAZvtj6EyB4yPyGQxPwU+Wvo6sNUYqiOaqU82fuK3uo7GeNMvABc1NGosvEbJQ2K95bO7bpq425IuT4fc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ILmwcM79; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ILmwcM79" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA042C4CEF1; Fri, 9 Jan 2026 12:13:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767960825; bh=HhdNFjcHWiMWXAw6o+8KOn8sEdDLS5BbWXrkGJLn2cU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ILmwcM79BgtINqROqOeWEpGV4dp/dKIVAvFZl8gudsK1KtP5zUZh6AXC8azf6lxZY rqAXi/GH7IOi2t70fZTHzRyeguf2beEzksqdr6AfKHrxhY0PhdgNGszdhjXT2lxFAp JadaFfKNPMiB4c7EoBIxDFVAOrzshDvQk/yxEJgk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Cong Zhang , Ming Lei , Jens Axboe , Sasha Levin Subject: [PATCH 6.6 539/737] blk-mq: skip CPU offline notify on unmapped hctx Date: Fri, 9 Jan 2026 12:41:18 +0100 Message-ID: <20260109112154.271028093@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112133.973195406@linuxfoundation.org> References: <20260109112133.973195406@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cong Zhang [ Upstream commit 10845a105bbcb030647a729f1716c2309da71d33 ] If an hctx has no software ctx mapped, blk_mq_map_swqueue() never allocates tags and leaves hctx->tags NULL. The CPU hotplug offline notifier can still run for that hctx, return early since hctx cannot hold any requests. Signed-off-by: Cong Zhang Fixes: bf0beec0607d ("blk-mq: drain I/O when all CPUs in a hctx are offline") Reviewed-by: Ming Lei Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/blk-mq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index a3cd5079557b..427a36237da3 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3578,7 +3578,7 @@ static int blk_mq_hctx_notify_offline(unsigned int cpu, struct hlist_node *node) struct blk_mq_hw_ctx, cpuhp_online); int ret = 0; - if (blk_mq_hctx_has_online_cpu(hctx, cpu)) + if (!hctx->nr_ctx || blk_mq_hctx_has_online_cpu(hctx, cpu)) return 0; /* -- 2.51.0