From mboxrd@z Thu Jan 1 00:00:00 1970 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 8699CCD13D8 for ; Sun, 17 Sep 2023 20:16:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240647AbjIQUQD (ORCPT ); Sun, 17 Sep 2023 16:16:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60206 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240686AbjIQUPt (ORCPT ); Sun, 17 Sep 2023 16:15:49 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3408E101 for ; Sun, 17 Sep 2023 13:15:44 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60DFDC433C7; Sun, 17 Sep 2023 20:15:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1694981743; bh=QB0xNPL6gGfOOIx/B6CvlWcZ6XvzpuuofnDrBpCjgs0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s/+9PJb7bnDB4o1/LmMwexwiwry/0DrnbgVZUhOCh+6NA24P5OU+NlPimRL8Op1io 5bHjThOjh4uvTVbGMAkPxgnOJkBG1Hw/IqhVeITZog4T7QGLZd9HxVuBoh2K6MzxBB A4sXmPVoI+PF03WoxnsmXciwkPNz7cuEjagaTy+c= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, William Zhang , Florian Fainelli , Miquel Raynal Subject: [PATCH 6.1 166/219] mtd: rawnand: brcmnand: Fix potential false time out warning Date: Sun, 17 Sep 2023 21:14:53 +0200 Message-ID: <20230917191047.027479217@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230917191040.964416434@linuxfoundation.org> References: <20230917191040.964416434@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: William Zhang commit 9cc0a598b944816f2968baf2631757f22721b996 upstream. If system is busy during the command status polling function, the driver may not get the chance to poll the status register till the end of time out and return the premature status. Do a final check after time out happens to ensure reading the correct status. Fixes: 9d2ee0a60b8b ("mtd: nand: brcmnand: Check flash #WP pin status before nand erase/program") Signed-off-by: William Zhang Reviewed-by: Florian Fainelli Cc: stable@vger.kernel.org Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20230706182909.79151-3-william.zhang@broadcom.com Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/nand/raw/brcmnand/brcmnand.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c @@ -1072,6 +1072,14 @@ static int bcmnand_ctrl_poll_status(stru cpu_relax(); } while (time_after(limit, jiffies)); + /* + * do a final check after time out in case the CPU was busy and the driver + * did not get enough time to perform the polling to avoid false alarms + */ + val = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS); + if ((val & mask) == expected_val) + return 0; + dev_warn(ctrl->dev, "timeout on status poll (expected %x got %x)\n", expected_val, val & mask);