From patchwork Tue Mar 7 16:44:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 13164169 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D35F0C6FD1D for ; Tue, 7 Mar 2023 16:46:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229933AbjCGQqz (ORCPT ); Tue, 7 Mar 2023 11:46:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59960 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229973AbjCGQqg (ORCPT ); Tue, 7 Mar 2023 11:46:36 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0AA9596C2F; Tue, 7 Mar 2023 08:43:38 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C1F82614DF; Tue, 7 Mar 2023 16:43:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1FC29C433B4; Tue, 7 Mar 2023 16:43:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1678207417; bh=YjMTLeqUrjD3XZwpoLNymTfC9unMud9yDlDAEDjzs2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G6i/dTXZ9vd1pcjWL1vwbzOt3WQ0cnyPYlHSN4wG2WigiFGDIZ97wiYCw9tjrL69S /3o5tXP6e9nwGRYuY21FaxZje5XxUsTtD36CzApzwQsUyCDHnzT/BnimU+sz9/EeRg mZBN4837pTcZt8XzHCULsRREs2n3+vcja7AJFQmM8Cdx7w6CDouhxINQ/gkidc4Sby rIwHehqOxIjxuCLrPD1tEzyg67IQZdEhX1+dVBapqrOyeJvqNh3fnNVhfRFA14/4Zx 7nSB3y+zWZtTHb+lMvx7mQFrttS4vRknRa2M4o9hYWsRfX2fDL5SoEbFOY/7JVqXSX xqKa77+PSN++w== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pZaQG-0003hq-UG; Tue, 07 Mar 2023 17:44:20 +0100 From: Johan Hovold To: Greg Kroah-Hartman Cc: Bjorn Andersson , Andy Gross , Konrad Dybcio , Jiri Slaby , Bartosz Golaszewski , Douglas Anderson , Daniel Thompson , linux-arm-msm@vger.kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold Subject: [PATCH 1/4] serial: qcom-geni: fix console shutdown hang Date: Tue, 7 Mar 2023 17:44:02 +0100 Message-Id: <20230307164405.14218-2-johan+linaro@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307164405.14218-1-johan+linaro@kernel.org> References: <20230307164405.14218-1-johan+linaro@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org A recent commit added back the calls top stop tx and rx to shutdown() which had previously been removed by commit e83766334f96 ("tty: serial: qcom_geni_serial: No need to stop tx/rx on UART shutdown") in order to be able to use kgdb after stopping the getty. Not only did this again break kgdb, but it also broke serial consoles more generally by hanging TX when stopping the getty during reboot. The underlying problem has been there since the driver was first merged and fixing it is going to be a bit involved so simply stop calling the broken stop functions during shutdown for consoles for now. Fixes: d8aca2f96813 ("tty: serial: qcom-geni-serial: stop operations in progress at shutdown") Cc: Bartosz Golaszewski Signed-off-by: Johan Hovold Reviewed-by: Douglas Anderson --- drivers/tty/serial/qcom_geni_serial.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index d69592e5e2ec..11da05d8f848 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -1070,6 +1070,10 @@ static int setup_fifos(struct qcom_geni_serial_port *port) static void qcom_geni_serial_shutdown(struct uart_port *uport) { disable_irq(uport->irq); + + if (uart_console(uport)) + return; + qcom_geni_serial_stop_tx(uport); qcom_geni_serial_stop_rx(uport); }