From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751614AbaENTC7 (ORCPT ); Wed, 14 May 2014 15:02:59 -0400 Received: from mail-pa0-f46.google.com ([209.85.220.46]:37288 "EHLO mail-pa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752626AbaENTCO (ORCPT ); Wed, 14 May 2014 15:02:14 -0400 Date: Wed, 14 May 2014 12:02:10 -0700 From: Dmitry Torokhov To: Stephen Boyd Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-input@vger.kernel.org, Arnd Bergmann Subject: Re: [PATCH] Input: pmic8xxx-pwrkey - Set sane default for debounce time Message-ID: <20140514190210.GJ30089@core.coreip.homeip.net> References: <1396289664-31893-1-git-send-email-sboyd@codeaurora.org> <20140331182315.GA9198@core.coreip.homeip.net> <5339B407.1050308@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5339B407.1050308@codeaurora.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 31, 2014 at 11:29:27AM -0700, Stephen Boyd wrote: > On 03/31/14 11:23, Dmitry Torokhov wrote: > > On Mon, Mar 31, 2014 at 11:14:24AM -0700, Stephen Boyd wrote: > >> If the debounce time is 0 our usage of ilog2() later on in this > >> driver will cause undefined behavior. If CONFIG_OF=n this fact is > >> evident to the compiler, and it emits a call to ____ilog2_NaN() > >> which doesn't exist. Fix this by setting a sane default for > >> debounce. > >> > >> Reported-by: Arnd Bergmann > >> Signed-off-by: Stephen Boyd > >> --- > >> drivers/input/misc/pmic8xxx-pwrkey.c | 2 +- > >> 1 file changed, 1 insertion(+), 1 deletion(-) > >> > >> diff --git a/drivers/input/misc/pmic8xxx-pwrkey.c b/drivers/input/misc/pmic8xxx-pwrkey.c > >> index 1cb8fda7a166..27add04676e1 100644 > >> --- a/drivers/input/misc/pmic8xxx-pwrkey.c > >> +++ b/drivers/input/misc/pmic8xxx-pwrkey.c > >> @@ -92,7 +92,7 @@ static int pmic8xxx_pwrkey_probe(struct platform_device *pdev) > >> bool pull_up; > >> > >> if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay)) > >> - kpd_delay = 0; > >> + kpd_delay = 15625; > > What if somebody supplied 0 via DT? Can we check and return -EINVAL? > > Sure. Here's a v2. > > -----8<------ > From: Stephen Boyd > Subject: [PATCH v2] Input: pmic8xxx-pwrkey - Set sane default for debounce > time > > If the debounce time is 0 our usage of ilog2() later on in this > driver will cause undefined behavior. If CONFIG_OF=n this fact is > evident to the compiler, and it emits a call to ____ilog2_NaN() > which doesn't exist. Fix this by setting a sane default for > debounce and failing to probe if debounce is 0 in the DT. > > Reported-by: Arnd Bergmann > Signed-off-by: Stephen Boyd Applied, thank you. Sorry for the delay. -- Dmitry