From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C0994F212; Mon, 11 Dec 2023 18:24:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="U1G5KQbW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6ECA8C433C8; Mon, 11 Dec 2023 18:24:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1702319099; bh=zcu1BurnRjCXwQLxoETEYQmguxxo52mWRtyoK/8TYVU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U1G5KQbWS7eDIxKcgmnOHE3vYVraxCD8ttMD4TEGS0EM0c9gScAytYG0MxeCLD6vc zgZGgUy3DHtisbVeGlcGgW9V61eJn4IRFhOl7KbxayrREzHtS9o1hUxgpiazA2xm83 GG6+4ZE/5iPwEYDz/m7M0FpdcOfi1vKXmNwSPdak= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Boerge Struempfel , Andy Shevchenko , Bartosz Golaszewski , Sasha Levin Subject: [PATCH 4.19 38/55] gpiolib: sysfs: Fix error handling on failed export Date: Mon, 11 Dec 2023 19:21:48 +0100 Message-ID: <20231211182013.671484691@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231211182012.263036284@linuxfoundation.org> References: <20231211182012.263036284@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Boerge Struempfel [ Upstream commit 95dd1e34ff5bbee93a28ff3947eceaf6de811b1a ] If gpio_set_transitory() fails, we should free the GPIO again. Most notably, the flag FLAG_REQUESTED has previously been set in gpiod_request_commit(), and should be reset on failure. To my knowledge, this does not affect any current users, since the gpio_set_transitory() mainly returns 0 and -ENOTSUPP, which is converted to 0. However the gpio_set_transitory() function calles the .set_config() function of the corresponding GPIO chip and there are some GPIO drivers in which some (unlikely) branches return other values like -EPROBE_DEFER, and -EINVAL. In these cases, the above mentioned FLAG_REQUESTED would not be reset, which results in the pin being blocked until the next reboot. Fixes: e10f72bf4b3e ("gpio: gpiolib: Generalise state persistence beyond sleep") Signed-off-by: Boerge Struempfel Reviewed-by: Andy Shevchenko Signed-off-by: Bartosz Golaszewski Signed-off-by: Sasha Levin --- drivers/gpio/gpiolib-sysfs.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index e0ccc79b239a5..7a8dfc36a6c15 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -495,14 +495,17 @@ static ssize_t export_store(struct class *class, } status = gpiod_set_transitory(desc, false); - if (!status) { - status = gpiod_export(desc, true); - if (status < 0) - gpiod_free(desc); - else - set_bit(FLAG_SYSFS, &desc->flags); + if (status) { + gpiod_free(desc); + goto done; } + status = gpiod_export(desc, true); + if (status < 0) + gpiod_free(desc); + else + set_bit(FLAG_SYSFS, &desc->flags); + done: if (status) pr_debug("%s: status %d\n", __func__, status); -- 2.42.0