ACK/Cmnt: [SRU][Bionic][PATCH 1/1] Revert "uio: use request_threaded_irq instead"

[Stefan Bader]

On 31.10.19 17:23, Kamal Mostafa wrote:
> From: Xiubo Li <xiubli at redhat.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1843487
> 
> 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 at intel.com
> CC: Ahsan Atta <ahsan.atta at intel.com>
> Signed-off-by: Xiubo Li <xiubli at redhat.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
> (backported from commit 3d27c4de8d4fb2d4099ff324671792aa2578c6f9)
> [kamal: applied just the mutex removal bit.]
> Signed-off-by: Kamal Mostafa <kamal at canonical.com>
Acked-by: Stefan Bader <stefan.bader at canonical.com>
> ---

SRU justification in bug report!

>  drivers/uio/uio.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
> index c7bc6b8f8d22..fb5c9701b1fb 100644
> --- a/drivers/uio/uio.c
> +++ b/drivers/uio/uio.c
> @@ -445,13 +445,10 @@ 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;
>  }
>  
> 


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