linux-kernel - Re: [PATCH] net: wireless: airo semaphore to mutex

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Date:	Mon, 26 May 2008 19:29:14 +0200
From:	Michal Schmidt <mschmidt@...hat.com>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	linville@...driver.com, rusty@...tcorp.com.au, matthew@....cx,
	mingo@...e.hu, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org, arjan@...radead.org
Subject: Re: [PATCH] net: wireless: airo semaphore to mutex

On Thu, 22 May 2008 16:21:03 -0700
Daniel Walker <dwalker@...sta.com> wrote:

> Signed-off-by: Daniel Walker <dwalker@...sta.com>
>  
> ---
>  drivers/net/wireless/airo.c |  107
> ++++++++++++++++++++++---------------------- 1 file changed, 54
> insertions(+), 53 deletions(-)
> 
> Index: linux-2.6.25/drivers/net/wireless/airo.c
> ===================================================================
> --- linux-2.6.25.orig/drivers/net/wireless/airo.c
> +++ linux-2.6.25/drivers/net/wireless/airo.c

> @@ -3211,7 +3212,7 @@ static irqreturn_t airo_interrupt(int ir
>  				set_bit(FLAG_UPDATE_UNI,
> &apriv->flags); set_bit(FLAG_UPDATE_MULTI, &apriv->flags);
>  
> -				if (down_trylock(&apriv->sem) != 0) {
> +				if (mutex_trylock(&apriv->lock) ==
> 0) { set_bit(JOB_EVENT, &apriv->jobs);
>  					wake_up_interruptible(&apriv->thr_wait);
>  				} else


Mutexes are not allowed in interrupt context, not even mutex_trylock.

Michal
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