From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Subject: [patch] ALSA: hdsp: silence and underflow warning Date: Fri, 21 Aug 2015 14:25:34 +0300 Message-ID: <20150821112534.GA983@mwanda> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: kernel-janitors-owner@vger.kernel.org To: Jaroslav Kysela Cc: Takashi Iwai , alsa-devel@alsa-project.org, kernel-janitors@vger.kernel.org List-Id: alsa-devel@alsa-project.org I believe this probably cannot happen, as the code suggests. There would have to be an kcontrol->index.id which was zero, otherwise this would be prevented in snd_ctl_find_id(). But snd_BUG_ON() is just a WARN() or a no-op so static checkers complain that we keep on going with a negative offset. Let's just handle the error as well as printing a warning. Signed-off-by: Dan Carpenter diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c index c19e021..468a95c 100644 --- a/sound/pci/rme9652/hdsp.c +++ b/sound/pci/rme9652/hdsp.c @@ -2806,7 +2806,8 @@ static int snd_hdsp_get_adat_sync_check(struct snd_kcontrol *kcontrol, struct sn struct hdsp *hdsp = snd_kcontrol_chip(kcontrol); offset = ucontrol->id.index - 1; - snd_BUG_ON(offset < 0); + if (snd_BUG_ON(offset < 0)) + return -EINVAL; switch (hdsp->io_type) { case Digiface: From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Date: Fri, 21 Aug 2015 11:25:34 +0000 Subject: [patch] ALSA: hdsp: silence and underflow warning Message-Id: <20150821112534.GA983@mwanda> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Jaroslav Kysela Cc: Takashi Iwai , alsa-devel@alsa-project.org, kernel-janitors@vger.kernel.org I believe this probably cannot happen, as the code suggests. There would have to be an kcontrol->index.id which was zero, otherwise this would be prevented in snd_ctl_find_id(). But snd_BUG_ON() is just a WARN() or a no-op so static checkers complain that we keep on going with a negative offset. Let's just handle the error as well as printing a warning. Signed-off-by: Dan Carpenter diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c index c19e021..468a95c 100644 --- a/sound/pci/rme9652/hdsp.c +++ b/sound/pci/rme9652/hdsp.c @@ -2806,7 +2806,8 @@ static int snd_hdsp_get_adat_sync_check(struct snd_kcontrol *kcontrol, struct sn struct hdsp *hdsp = snd_kcontrol_chip(kcontrol); offset = ucontrol->id.index - 1; - snd_BUG_ON(offset < 0); + if (snd_BUG_ON(offset < 0)) + return -EINVAL; switch (hdsp->io_type) { case Digiface: