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

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Message-Id: <20180812115823.10377-1-xiubli@redhat.com>
Date:   Sun, 12 Aug 2018 07:58:23 -0400
From:   xiubli@...hat.com
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, james.r.harris@...el.com,
        Xiubo Li <xiubli@...hat.com>, Ahsan Atta <ahsan.atta@...el.com>
Subject: [PATCH] Revert "uio: use request_threaded_irq instead"

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

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>
---
 drivers/uio/uio.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 5d421d7..d7fb493 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -443,13 +443,10 @@ static irqreturn_t uio_interrupt(int irq, void *dev_id)
 	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;
 }
 
@@ -969,9 +966,8 @@ int __uio_register_device(struct module *owner,
 		 * 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)
 			goto err_request_irq;
 	}
-- 
1.8.3.1