From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jaswinder Singh Rajput Subject: Re: [PATCH] Input: bcm5974.c initialize raw_w, raw_x and raw_y before it get used Date: Mon, 14 Sep 2009 14:30:53 +0530 Message-ID: <1252918853.3123.5.camel@ht.satnam> References: <1252775770.3687.7.camel@ht.satnam> <4AAC2DBE.9040303@bitmath.org> <1252830690.3440.5.camel@ht.satnam> <4AACD9E9.4000702@bitmath.org> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:43140 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755279AbZINJBC (ORCPT ); Mon, 14 Sep 2009 05:01:02 -0400 In-Reply-To: <4AACD9E9.4000702@bitmath.org> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Henrik Rydberg Cc: Dmitry Torokhov , linux-input@vger.kernel.org Hello Henrik, On Sun, 2009-09-13 at 13:39 +0200, Henrik Rydberg wrote: > Jaswinder Singh Rajput wrote: > > On Sun, 2009-09-13 at 01:24 +0200, Henrik Rydberg wrote: > >> Jaswinder Singh Rajput wrote: > >>> raw_w, raw_x and raw_y is used uninitialized for !raw_n > >> Thanks for the heads up, but actually not, since !raw_n also implies > >> !(ptest > PRESSURE_LOW). > >> > > > > Then can we move 'if (ptest > PRESSURE_LOW && origin)' stuff to 'if > > (raw_n)'. If not then my patch is correct. > > Yes, that's it, thanks. So this patch ought to solve the warning cleanly: hmm, even then there is room for improvement and save some cpu cycles : diff --git a/drivers/input/mouse/bcm5974.c b/drivers/input/mouse/bcm5974.c index 2d8fc0b..21ea2e3 100644 --- a/drivers/input/mouse/bcm5974.c +++ b/drivers/input/mouse/bcm5974.c @@ -316,8 +316,7 @@ static int report_tp_state(struct bcm5974 *dev, int size) const struct bcm5974_config *c = &dev->cfg; const struct tp_finger *f; struct input_dev *input = dev->input; - int raw_p, raw_w, raw_x, raw_y, raw_n; - int ptest = 0, origin = 0, ibt = 0, nmin = 0, nmax = 0; + int raw_n, ibt = 0, nmin = 0, nmax = 0; int abs_p = 0, abs_w = 0, abs_x = 0, abs_y = 0; if (size < c->tp_offset || (size - c->tp_offset) % SIZEOF_FINGER != 0) @@ -329,6 +328,9 @@ static int report_tp_state(struct bcm5974 *dev, int size) /* always track the first finger; when detached, start over */ if (raw_n) { + int raw_p, raw_w, raw_x, raw_y; + int ptest, origin; + raw_p = raw2int(f->force_major); raw_w = raw2int(f->size_major); raw_x = raw2int(f->abs_x); And by changing little bit programming logic you can also reduce variable count and save some more cpu cycles. Thanks, -- JSR