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Mon, 09 Mar 2026 23:18:35 -0700 (PDT) Date: Mon, 9 Mar 2026 23:18:33 -0700 From: Dmitry Torokhov To: Ilpo =?utf-8?B?SsOkcnZpbmVu?= Cc: Santosh Kumar Yadav , Peter Korsgaard , Hans de Goede , Linus Walleij , Bartosz Golaszewski , platform-driver-x86@vger.kernel.org, LKML , linux-gpio@vger.kernel.org Subject: Re: [PATCH] platform/x86: barco-p50-gpio: normalize return value of gpio_get Message-ID: References: <5d561d59-1691-fcd0-868c-fc44db1dac92@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <5d561d59-1691-fcd0-868c-fc44db1dac92@linux.intel.com> On Mon, Feb 23, 2026 at 04:11:10PM +0200, Ilpo Järvinen wrote: > On Wed, 18 Feb 2026, Dmitry Torokhov wrote: > > > The GPIO get callback is expected to return 0 or 1 (or a negative error > > code). Ensure that the value returned by p50_gpio_get() is normalized > > to the [0, 1] range. > > > > Signed-off-by: Dmitry Torokhov > > --- > > drivers/platform/x86/barco-p50-gpio.c | 5 ++++- > > 1 file changed, 4 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/platform/x86/barco-p50-gpio.c b/drivers/platform/x86/barco-p50-gpio.c > > index 6f13e81f98fb..360ffd8505d6 100644 > > --- a/drivers/platform/x86/barco-p50-gpio.c > > +++ b/drivers/platform/x86/barco-p50-gpio.c > > @@ -275,8 +275,11 @@ static int p50_gpio_get(struct gpio_chip *gc, unsigned int offset) > > mutex_lock(&p50->lock); > > > > ret = p50_send_mbox_cmd(p50, P50_MBOX_CMD_READ_GPIO, gpio_params[offset], 0); > > - if (ret == 0) > > + if (ret == 0) { > > ret = p50_read_mbox_reg(p50, P50_MBOX_REG_DATA); > > + if (ret >= 0) > > + ret = !!ret; > > + } > > > > mutex_unlock(&p50->lock); > > A simpler flow would be preferrable over all that nesting. Is this > logically correct: > > guard(mutex)(p50->lock); > ret = p50_send_mbox_cmd(p50, P50_MBOX_CMD_READ_GPIO, gpio_params[offset], 0); > if (ret < 0) > return ret; > > ret = p50_read_mbox_reg(p50, P50_MBOX_REG_DATA); > if (ret < 0) > return ret; > > return !!ret; Yes, but I wanted to minimize the amount of change. Maybe I should send a followup patch converting to guard()? Thanks. -- Dmitry