From patchwork Mon Apr 27 15:09:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Russell King \(Oracle\)" X-Patchwork-Id: 207673 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18E8EC54FCB for ; Mon, 27 Apr 2020 15:09:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC67B206B9 for ; Mon, 27 Apr 2020 15:09:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="GvVlP0Xn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728044AbgD0PJi (ORCPT ); Mon, 27 Apr 2020 11:09:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1728032AbgD0PJi (ORCPT ); Mon, 27 Apr 2020 11:09:38 -0400 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [IPv6:2001:4d48:ad52:3201:214:fdff:fe10:1be6]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F0231C0610D5 for ; Mon, 27 Apr 2020 08:09:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Date:Sender:Message-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Subject:To:From:References:In-Reply-To :Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=wA9dKzNLLF0BWFBqTEtvkviVPy66XTxu2X6hrxXvJ2Q=; b=GvVlP0XnGqDwU+nDWDt8bTrFLA XYOTHwGZJl2zeml+t7G7IuP+yt/PCk0ENQXOfHD83gdgMeuclhIPRtdov5SIpCwsgjY1o38lIJABw BzxNimMjcDuhG2TQon/C9KBFdOXiIN4N2CVufTKltFZR8tPPp+QBudpA2fZuR468oed0knv/GCnr1 VfBrwG3ShUQqRw8b7iNTe8kaQrddt9Gpcwv6cVaErdTy3BcVjZwYnK5eS5hxijaRfG2FOCUr5yfKX mQlkW4ucJxEbT0knY//E69VXsn9I5pC2J6ke8oNWrx86vDbZFofL9bSuCofcSDG8dj1sqLqOav9ei wF0YXfig==; Received: from e0022681537dd.dyn.armlinux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:41872 helo=rmk-PC.armlinux.org.uk) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jT5O2-0003Yk-Dg; Mon, 27 Apr 2020 16:09:34 +0100 Received: from rmk by rmk-PC.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1jT5O1-0001s6-SD; Mon, 27 Apr 2020 16:09:33 +0100 In-Reply-To: <20200427150755.GT5827@shell.armlinux.org.uk> References: <20200427150755.GT5827@shell.armlinux.org.uk> From: Russell King To: linux-i2c@vger.kernel.org Subject: [PATCH REPOST 12/12] i2c: pxa: fix i2c_pxa_wait_bus_not_busy() boundary condition MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Mon, 27 Apr 2020 16:09:33 +0100 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Fix i2c_pxa_wait_bus_not_busy()'s boundary conditions, so that a coincidental success and timeout results in the function returning success. Signed-off-by: Russell King --- drivers/i2c/busses/i2c-pxa.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index 3c7f67d802a7..ade0203d35cf 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -416,19 +416,26 @@ static void i2c_pxa_abort(struct pxa_i2c *i2c) static int i2c_pxa_wait_bus_not_busy(struct pxa_i2c *i2c) { int timeout = DEF_TIMEOUT; + u32 isr; - while (timeout-- && readl(_ISR(i2c)) & (ISR_IBB | ISR_UB)) { - if ((readl(_ISR(i2c)) & ISR_SAD) != 0) + while (1) { + isr = readl(_ISR(i2c)); + if (!(isr & (ISR_IBB | ISR_UB))) + return 0; + + if (isr & ISR_SAD) timeout += 4; + if (!timeout--) + break; + msleep(2); show_state(i2c); } - if (timeout < 0) - show_state(i2c); + show_state(i2c); - return timeout < 0 ? I2C_RETRY : 0; + return I2C_RETRY; } static int i2c_pxa_wait_master(struct pxa_i2c *i2c)