[PATCH 4.18 26/35] Revert "uio: use request_threaded_irq instead"

[Greg Kroah-Hartman]

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

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

From: Xiubo Li <xiu...@redhat.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.har...@intel.com
CC: Ahsan Atta <ahsan.a...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

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

--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -443,13 +443,10 @@ 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;
 }
 
@@ -969,9 +966,8 @@ 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)
                        goto err_request_irq;
        }