From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794590673; b=ivWtsZuRARs/75sQaP0EsEN1auNljn/CbdstavCs4QZErhLrGrLYKij7IlN1KUtxdfgH yGgGlPblnh2kxgxHCnYbhOM5IJNDuuw2u0IJUeOxWrjCoi46kSxfgmtRzeeb32aDR6gxV Ydh3+aIaemJGB9vdv3sbrbtBSJ9luu6me9hVwrQFzeeLg9vLu3RPR1RWDK7DmMJIjh/u6 v8VEOyExrQju74fcgYp8iJdOSS/WCFDbsd8ULysWb/xR3uA5Q7TBPNDhV2XckOi0z1YQW riu6DgHuqRBspheVqGVaQyeyxswhbgTpy9OC6R3o/qxP+a+Qwzs9tJdZNo/e3NpY5bQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794590673; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=xI/F+SuVIRzPVbIc+slO7QOc1umIckPo7Icbq0b1SEs=; b=bKs7QtyNx2SXGZpkdDLzPbQjIkAuDaind9nacDMOeV04gbTb16CqG0SBmjjo1Am3rmNG hTmaJ2n2GQJYCYe3LA/GeVBw7IZz0Jiko6lhIB1du+EHChj4XUZAh76O/DT8iIYf3MqeV bew+WtT9YYaGMUxmQdvtnoojDDmonEUKA0p/SQ0xh6TrN1cwjw9p5JoZTNVBFT/pSximB xXZnpLRNdNpLm2nrY70wVz+7uPCAoqv75/4Ytu1kyf1ivxkYR3zGJRYd2m2FkrMfnPX+U ueYaV65AT0X0SKtKlPSh5YU32GnCl1TJkhnN0NoItvVHCQKa20w6uyk1AWTiT4kYTLQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=hUuXZctM; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E58936077D7F; Fri, 13 Nov 2026 17:24:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=hUuXZctM Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91F371F000C4; Fri, 13 Nov 2026 17:24:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794590672; bh=xI/F+SuVIRzPVbIc+slO7QOc1umIckPo7Icbq0b1SEs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=hUuXZctM5QLtHIsfFOI8/k/I9yPBimGx8acPWSKSyY7VV7x/hEchARBoucXjkR6Kw LOt77zyes1IrnDc20wrkRPDkbqvq8XyutW90wwKcvEJUKAEa7wFNtYbg91pachc/+5 mEUWetdQCZzv58I14FF316arMKbCrvRwpmHMSQPs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable@kernel.org, Hugo Villeneuve , Sasha Levin Subject: [PATCH 6.18 587/686] serial: sc16is7xx: declare MCR and IER as volatile registers Date: Fri, 13 Nov 2026 10:52:00 -0500 Message-ID: <20261113153841.701867166@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261113153820.902362109@linuxfoundation.org> References: <20261113153820.902362109@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hugo Villeneuve [ Upstream commit 1c41d09dcd07ee9648e20aa8238e404c2e6a12fb ] MCR register has the same address as XON1 register. IER register has the same address as DLH register. Which register is accessed depends on bits configuration in some other registers. To prevent potential access errors, declare MCR and IER as volatile registers. Fixes: dfeae619d781 ("serial: sc16is7xx") Cc: stable@kernel.org Signed-off-by: Hugo Villeneuve Link: https://patch.msgid.link/20261006192540.234402-1-hugo@hugovil.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/sc16is7xx.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index b2d020a0b20d0..b5e301741b844 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -539,7 +539,9 @@ static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg) { switch (reg) { case SC16IS7XX_RHR_REG: /* Shared address space with THR & DLL */ + case SC16IS7XX_IER_REG: /* Shared address space with DLH */ case SC16IS7XX_IIR_REG: /* Shared address space with FCR & EFR */ + case SC16IS7XX_MCR_REG: /* Shared address space with XON1 */ case SC16IS7XX_LSR_REG: /* Shared address space with XON2 */ case SC16IS7XX_MSR_REG: /* Shared address space with TCR & XOFF1 */ case SC16IS7XX_SPR_REG: /* Shared address space with TLR & XOFF2 */ -- 2.53.0