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Mon, 26 Jun 2023 10:40:01 +0000 From: YE Chengfeng <cyeaa@connect.ust.hk> To: Linus Walleij <linus.walleij@linaro.org>, Bartosz Golaszewski <brgl@bgdev.pl>, "andy@kernel.org" <andy@kernel.org> CC: "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: [PATCH v2 2/2] gpiolib: cdev: Fix &le->wait.lock deadlock issue Thread-Topic: [PATCH v2 2/2] gpiolib: cdev: Fix &le->wait.lock deadlock issue Thread-Index: AQHZqBRmxizNLtHXWE+SgIMBvkENRg== Date: Mon, 26 Jun 2023 10:40:01 +0000 Message-ID: <TYCP286MB1188DCADAAC7318EEC06293E8A26A@TYCP286MB1188.JPNP286.PROD.OUTLOOK.COM> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=connect.ust.hk; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: TYCP286MB1188:EE_|TYCP286MB1730:EE_ x-ms-office365-filtering-correlation-id: e15352f2-67b3-486f-5c16-08db7631b1b7 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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[v2,1/2] gpiolib: cdev: Fix &lr->wait.lock deadlock issue
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diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index f768d46bdea7..a2c108f172f2 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -1858,28 +1858,28 @@ static ssize_t lineevent_read_unlocked(struct file *file, char __user *buf, return -EINVAL; do { - spin_lock(&le->wait.lock); + spin_lock_irq(&le->wait.lock); if (kfifo_is_empty(&le->events)) { if (bytes_read) { - spin_unlock(&le->wait.lock); + spin_unlock_irq(&le->wait.lock); return bytes_read; } if (file->f_flags & O_NONBLOCK) { - spin_unlock(&le->wait.lock); + spin_unlock_irq(&le->wait.lock); return -EAGAIN; } - ret = wait_event_interruptible_locked(le->wait, + ret = wait_event_interruptible_locked_irq(le->wait, !kfifo_is_empty(&le->events)); if (ret) { - spin_unlock(&le->wait.lock); + spin_unlock_irq(&le->wait.lock); return ret; } } ret = kfifo_out(&le->events, &ge, 1); - spin_unlock(&le->wait.lock); + spin_unlock_irq(&le->wait.lock); if (ret != 1) { /* * This should never happen - we were holding the lock
The softirq lineevent_irq_thread() could deadlock on &le->wait.lock if it preempts lineevent_read_unlocked() which acquires the same lock but not disable irq. Fix the potential deadlock by spin_lock_irq(). Fixes: dea9c80ee672 ("gpiolib: rework the locking mechanism for lineevent kfifo") Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk> --- drivers/gpio/gpiolib-cdev.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)