From patchwork Wed Apr 27 18:24:38 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Poirier X-Patchwork-Id: 8961641 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 0BB229F441 for ; Wed, 27 Apr 2016 18:26:56 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3C2C520259 for ; Wed, 27 Apr 2016 18:26:55 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 574542024D for ; Wed, 27 Apr 2016 18:26:54 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1avU9C-0005TP-O7; Wed, 27 Apr 2016 18:25:14 +0000 Received: from mail-io0-x236.google.com ([2607:f8b0:4001:c06::236]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1avU97-0004Hd-IV for linux-arm-kernel@lists.infradead.org; Wed, 27 Apr 2016 18:25:11 +0000 Received: by mail-io0-x236.google.com with SMTP id 190so49112215iow.1 for ; Wed, 27 Apr 2016 11:24:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=M0Vz4jELsdygRwR1zfT65DzxX2fCuAAmE/u/zXWmzz4=; b=WkgnVd6WyF9asY7T2Th/eFqZmggnOPQa8wTWh3XjHaWxgXOkP9JE4WYAAGa8kUXbli RSdDtPV/DKJLyTmBTH8x8a8FvUJWe3+Itsr1f174sXJdA9beI9ZEcQZag0JPxJC9NSEM o2qdVSMCFw3+fcI7VdcdkUOgF5nEzF83VgcuM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=M0Vz4jELsdygRwR1zfT65DzxX2fCuAAmE/u/zXWmzz4=; b=CjwfsAf2NvkqwUc7ztkZA3y3GKgStsY3r6AonDNX9eLWL+dQ4ydZP26+5zdeyx0L9e F2FCeZpijXPUwIA/wriH3ZhyVUfCnVMeP+XWu9xZUI1X89/7p4zhq9Ric9+ex5zhtulh xgOxa9sZ1cBX0DPEgSw5Y2zGsbqD22ZJl63TKQLw6hgmdE47D2eGKz3Yyftx63C/mBDa XArq8Trm4Za3NOm3rVM0eUhUDLLGQqfLWHD8okIBxZjwnXfZwaSarBaDB3DiLAAQIdKz xrBYmKm7s/3aYcZlCYS+GC1ztR5cfk5EelE+JTAO/+74sgxYvE/l+k53+TIxrvS9Bvdw xitg== X-Gm-Message-State: AOPr4FXJzSvSUv7gjPLMbZIY+SuqJvERDeUqnZPCvoGUgFHpi1Lka55jG1Qv+3nqN+AGSvgC X-Received: by 10.107.142.194 with SMTP id q185mr11960812iod.37.1461781481358; Wed, 27 Apr 2016 11:24:41 -0700 (PDT) Received: from t430.cg.shawcable.net (S0106002369de4dac.cg.shawcable.net. [68.147.8.254]) by smtp.gmail.com with ESMTPSA id ym16sm15162067igc.4.2016.04.27.11.24.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 27 Apr 2016 11:24:39 -0700 (PDT) From: Mathieu Poirier To: linux-arm-kernel@lists.infradead.org, Suzuki.Poulose@arm.com Subject: [PATCH] coresight: etb10: adjust read pointer only when needed Date: Wed, 27 Apr 2016 12:24:38 -0600 Message-Id: <1461781478-6226-1-git-send-email-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.5.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160427_112509_886495_7FCCE40B X-CRM114-Status: GOOD ( 12.26 ) X-Spam-Score: -2.7 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The read pointer (read_ptr) needs to be adjusted only if its value has gone beyond the length of the memory buffer. Reported-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier --- drivers/hwtracing/coresight/coresight-etb10.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c index 586c98fbdb03..1e4031ee8969 100644 --- a/drivers/hwtracing/coresight/coresight-etb10.c +++ b/drivers/hwtracing/coresight/coresight-etb10.c @@ -428,7 +428,8 @@ static void etb_update_buffer(struct coresight_device *csdev, read_ptr = (write_ptr + drvdata->buffer_depth) - to_read / ETB_FRAME_SIZE_WORDS; /* Wrap around if need be*/ - read_ptr &= ~(drvdata->buffer_depth - 1); + if (read_ptr > (drvdata->buffer_depth - 1)) + read_ptr -= drvdata->buffer_depth; /* let the decoder know we've skipped ahead */ local_inc(&buf->lost); }