linux-kernel - [PATCH 4.14 35/35] Revert "uio: use request_threaded

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Message-Id: <20190213183707.599505725@linuxfoundation.org>
Date:   Wed, 13 Feb 2019 19:38:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        james.r.harris@...el.com, Ahsan Atta <ahsan.atta@...el.com>,
        Xiubo Li <xiubli@...hat.com>,
        Tommi Rantala <tommi.t.rantala@...ia.com>
Subject: [PATCH 4.14 35/35] Revert "uio: use request_threaded_irq instead"

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Xiubo Li <xiubli@...hat.com>

commit 3d27c4de8d4fb2d4099ff324671792aa2578c6f9 upstream.

Since mutex lock in irq hanler is useless currently, here will
remove it together with it.

This reverts commit 9421e45f5ff3d558cf8b75a8cc0824530caf3453.

Reported-by: james.r.harris@...el.com
CC: Ahsan Atta <ahsan.atta@...el.com>
Signed-off-by: Xiubo Li <xiubli@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Tommi Rantala <tommi.t.rantala@...ia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/uio/uio.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -445,13 +445,10 @@ static irqreturn_t uio_interrupt(int irq
 	struct uio_device *idev = (struct uio_device *)dev_id;
 	irqreturn_t ret;
 
-	mutex_lock(&idev->info_lock);
-
 	ret = idev->info->handler(irq, idev->info);
 	if (ret == IRQ_HANDLED)
 		uio_event_notify(idev->info);
 
-	mutex_unlock(&idev->info_lock);
 	return ret;
 }
 
@@ -974,9 +971,8 @@ int __uio_register_device(struct module
 		 * FDs at the time of unregister and therefore may not be
 		 * freed until they are released.
 		 */
-		ret = request_threaded_irq(info->irq, NULL, uio_interrupt,
-					   info->irq_flags, info->name, idev);
-
+		ret = request_irq(info->irq, uio_interrupt,
+				  info->irq_flags, info->name, idev);
 		if (ret) {
 			info->uio_dev = NULL;
 			goto err_request_irq;