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Thu, 19 Feb 2026 08:59:47 -0800 (PST) Date: Thu, 19 Feb 2026 08:59:45 -0800 From: Dmitry Torokhov To: Bartosz Golaszewski Cc: Linus Walleij , Bartosz Golaszewski , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2] gpiolib: normalize the return value of gc->get() on behalf of buggy drivers Message-ID: References: <20260219-gpiolib-set-normalize-v2-1-f84630e45796@oss.qualcomm.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260219-gpiolib-set-normalize-v2-1-f84630e45796@oss.qualcomm.com> On Thu, Feb 19, 2026 at 10:51:33AM +0100, Bartosz Golaszewski wrote: > Commit 86ef402d805d ("gpiolib: sanitize the return value of > gpio_chip::get()") started checking the return value of the .get() > callback in struct gpio_chip. Now - almost a year later - it turns out > that there are quite a few drivers in tree that can break with this > change. Partially revert it: normalize the return value in GPIO core but > also emit a warning. > > Cc: stable@vger.kernel.org > Fixes: 86ef402d805d ("gpiolib: sanitize the return value of gpio_chip::get()") > Reported-by: Dmitry Torokhov > Closes: https://lore.kernel.org/all/aZSkqGTqMp_57qC7@google.com/ > Signed-off-by: Bartosz Golaszewski > --- > Changes in v2: > - it's gpio_chip::get() that needs normalizing, not gpio_chip::set() > - Link to v1: https://patch.msgid.link/20260219-gpiolib-set-normalize-v1-1-f0d53a009db4@oss.qualcomm.com > --- > drivers/gpio/gpiolib.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c > index c52200eaaaff82b12f22dd1ee8459bdd8ec10d81..c9cd751e7de2307fc5994eb682c53f2b3ce39233 100644 > --- a/drivers/gpio/gpiolib.c > +++ b/drivers/gpio/gpiolib.c > @@ -3268,8 +3268,12 @@ static int gpiochip_get(struct gpio_chip *gc, unsigned int offset) > > /* Make sure this is called after checking for gc->get(). */ > ret = gc->get(gc, offset); > - if (ret > 1) > - ret = -EBADE; > + if (ret > 1) { > + gpiochip_warn(gc, > + "invalid return value from gc->get(): %d, consider fixing the driver\n", > + ret); > + ret = !!ret; > + } > > return ret; > } Thank you Bartosz. I guess this could turn out to be pretty noisy but maybe that will make users report it faster ;) Reviewed-by: Dmitry Torokhov -- Dmitry