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 4F673276057; Tue, 27 May 2025 16:55:35 +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=1748364935; cv=none; b=Y85N8tfymLkmW6TEipWgwFY1Qef3sRGpu0aLwShEtVepLFqSdjpCjkrltcYJzCotOfL4tkhLqwKvSwQFFI74+kjqzXwVSOmUcPIcfNz4e74F/8ClUsuUxGx7CCBuTc0yimeoZXcUBU1t4pKiP4KPCwMRKxp6XBKuNTr0ZerKMV8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748364935; c=relaxed/simple; bh=6BzOdGwj8GZ9VZfZKdfEtMZxwSnuBfj6bCI2PBMXE7w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QxtHB9ohIvQ1DviZXlrNVTcXId4WPskAkeWxCVrZypaq9Wq0xoopJmVlPRatu9gSuRnGqGcp62+9qEsVvpMslpZA0aDTKDcq1APfchFHO4JJkVHDu1QsVVmgXihqbKMoMFHZoQxKJVO2/hO52Ah4HYC5D51/wGcqTB5cdw0PzFY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Sr8g9FGM; 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="Sr8g9FGM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF5E7C4CEE9; Tue, 27 May 2025 16:55:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1748364935; bh=6BzOdGwj8GZ9VZfZKdfEtMZxwSnuBfj6bCI2PBMXE7w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Sr8g9FGMaAko65E4tiWnFpWEOkq6tYhsO0Fdq43/fGQR7llJkpseUHegg+v+nVPk1 HG9AlG6A5XebxbcBHoeMIDrl68ZAW2P2zfpGKOuwp5eBP0pekPgt3O0Eps6GAlpFFV 7BWSt7lY1QdV4H2M8Dp/HvUDh0YTLKuIC5Scww7g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Marcos Paulo de Souza , Petr Mladek , John Ogness , Sasha Levin Subject: [PATCH 6.12 183/626] printk: Check CON_SUSPEND when unblanking a console Date: Tue, 27 May 2025 18:21:16 +0200 Message-ID: <20250527162452.444908675@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250527162445.028718347@linuxfoundation.org> References: <20250527162445.028718347@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Marcos Paulo de Souza [ Upstream commit 72c96a2dacc0fb056d13a5f02b0845c4c910fe54 ] The commit 9e70a5e109a4 ("printk: Add per-console suspended state") introduced the CON_SUSPENDED flag for consoles. The suspended consoles will stop receiving messages, so don't unblank suspended consoles because it won't be showing anything either way. Signed-off-by: Marcos Paulo de Souza Reviewed-by: Petr Mladek Reviewed-by: John Ogness Link: https://lore.kernel.org/r/20250226-printk-renaming-v1-5-0b878577f2e6@suse.com Signed-off-by: Petr Mladek Signed-off-by: Sasha Levin --- kernel/printk/printk.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 881a26e18c658..3a91b739e8f30 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -3310,7 +3310,12 @@ void console_unblank(void) */ cookie = console_srcu_read_lock(); for_each_console_srcu(c) { - if ((console_srcu_read_flags(c) & CON_ENABLED) && c->unblank) { + short flags = console_srcu_read_flags(c); + + if (flags & CON_SUSPENDED) + continue; + + if ((flags & CON_ENABLED) && c->unblank) { found_unblank = true; break; } @@ -3347,7 +3352,12 @@ void console_unblank(void) cookie = console_srcu_read_lock(); for_each_console_srcu(c) { - if ((console_srcu_read_flags(c) & CON_ENABLED) && c->unblank) + short flags = console_srcu_read_flags(c); + + if (flags & CON_SUSPENDED) + continue; + + if ((flags & CON_ENABLED) && c->unblank) c->unblank(); } console_srcu_read_unlock(cookie); -- 2.39.5