From patchwork Thu Aug 27 20:41:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Raul Rangel X-Patchwork-Id: 11741853 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5344213B6 for ; Thu, 27 Aug 2020 20:42:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3AAC22084C for ; Thu, 27 Aug 2020 20:42:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="iPl0Mhlq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727024AbgH0UmB (ORCPT ); Thu, 27 Aug 2020 16:42:01 -0400 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 S1727020AbgH0UmA (ORCPT ); Thu, 27 Aug 2020 16:42:00 -0400 Received: from mail-io1-xd41.google.com (mail-io1-xd41.google.com [IPv6:2607:f8b0:4864:20::d41]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8161C06121B for ; Thu, 27 Aug 2020 13:41:59 -0700 (PDT) Received: by mail-io1-xd41.google.com with SMTP id s2so7306270ioo.2 for ; Thu, 27 Aug 2020 13:41:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=EoftoojDAeVQX8wY//7x/4UEhS50XaZvmdzOjteBfD8=; b=iPl0MhlqabvHFYLDmYvok+Mrp6RvrqRbSln+E29jFumpS4aG52HkTFqVGZNsjWqYwN zN0LhwmdAQtnGBhDxWEHM9GFn3gjWiKp0q7V77nvFhDbDO2Yji8oRr/M/plDLHaiB5qX xAjbLaMe7V9I68zWkeJev/SnhldaRBAisJBSI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=EoftoojDAeVQX8wY//7x/4UEhS50XaZvmdzOjteBfD8=; b=iY4WSDMVIEJ/XfNStoYQ2c9h85XxgK00pSKW2pjdgCC6kQKBIgP2GnUZReXqKPHGaM yj8kTnw1KJv1JJCldLzXmYoyzKmVzeMw4qyKUVO+rrJgRNKPTCI73eBdY56VT015AZgD AY8kPk80+o4n9/xcRTcU6HW8KqgILGWDRFCTIhOjTx1xB7nCfKR1EgFL44121sJDFRTZ Z006dq+dl2jVN6ldO43n+M517viuGWt5Uerd7YLtFLSzwVOb9FRAkiMZPPo/zoFNKvHI pYpAlbUNLeCuzWI9OgKeUgnfiMS+rwZs3noSRpdIlP7KAJ8ceyXd9lu73ivQjwIfkKAa UOBA== X-Gm-Message-State: AOAM531C4x184sXU1FmvMR+Zo8KYXcrO5B08+fxQDRAGTFlou9zTO359 el1UROJ1lXxUOGZH5o73GgOtxcwW7z17VWAa X-Google-Smtp-Source: ABdhPJwUUS+SW6nQgzx12+Hfezv3y+Z7TwGFeh9cjJ9mkhkwvKbByOPK1VP/r2YVwSiB6ImEx1Rk9g== X-Received: by 2002:a05:6638:12d4:: with SMTP id v20mr20156929jas.108.1598560918954; Thu, 27 Aug 2020 13:41:58 -0700 (PDT) Received: from rrangel920.bld.corp.google.com (h184-60-195-141.arvdco.broadband.dynamic.tds.net. [184.60.195.141]) by smtp.gmail.com with ESMTPSA id u17sm1640328ilj.0.2020.08.27.13.41.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Aug 2020 13:41:58 -0700 (PDT) From: Raul E Rangel To: linux-input@vger.kernel.org Cc: dmitry.torokhov@gmail.com, Shirish.S@amd.com, Raul E Rangel , Rajat Jain , Stephen Boyd , linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] Input: i8042 - Lock i8042_mutex before flushing Date: Thu, 27 Aug 2020 14:41:54 -0600 Message-Id: <20200827144112.v2.2.I1417edfd3526143f14fea2546787ba4bb6f32ae8@changeid> X-Mailer: git-send-email 2.28.0.297.g1956fa8f8d-goog In-Reply-To: <20200827144112.v2.1.I6981f9a9f0c12e60f8038f3b574184f8ffc1b9b5@changeid> References: <20200827144112.v2.1.I6981f9a9f0c12e60f8038f3b574184f8ffc1b9b5@changeid> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Make i8042_flush lock the i8042_mutex before flushing the buffer. This will prevent i8042_flush from clearing the buffer while a PS/2 command is in progress. I'm not sure if this is really possible. We already hold the lock when calling i8042_command, so this makes i8042_flush have the same behavior. Signed-off-by: Raul E Rangel --- (no changes since v1) drivers/input/serio/i8042.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c index 65ca6b47f41e8..b7ed93c5095c4 100644 --- a/drivers/input/serio/i8042.c +++ b/drivers/input/serio/i8042.c @@ -254,6 +254,8 @@ static int i8042_flush(void) int count = 0; int retval = 0; + mutex_lock(&i8042_mutex); + spin_lock_irqsave(&i8042_lock, flags); while ((str = i8042_read_status()) & I8042_STR_OBF) { @@ -270,6 +272,8 @@ static int i8042_flush(void) spin_unlock_irqrestore(&i8042_lock, flags); + mutex_unlock(&i8042_mutex); + return retval; }