linux-kernel - Re: [PATCH] wait_for_completion

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Message-ID: <20141231103157.GA20842@sudip-PC>
Date:	Wed, 31 Dec 2014 16:01:57 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Nicholas Mc Guire <der.herr@...r.at>
Cc:	Inaky Perez-Gonzalez <inaky.perez-gonzalez@...el.com>,
	linux-wimax@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wait_for_completion_timeout does not return < 0

On Wed, Dec 31, 2014 at 04:04:03AM -0500, Nicholas Mc Guire wrote:
> This is only removing the comment which is misleading as
> wait_for_completion_timeout does not return < 0 thus there
> never is anything to be passed on.

a small doubt - 
i am seeing that:
unsigned long wait_for_completion_timeout() is calling
long wait_for_common()  which is again calling 
long __wait_for_common which is again calling
long do_wait_for_common()

now the return value from do_wait_for_common can be -ERESTARTSYS,
so then what happens when wait_for_completion_timeout return this -ERESTARTSYS as an unsigned value ?
it becomes a positive value, and ultimately ctx.result (which is 0) is returned.
so then are we just ignoring the error value from do_wait_for_common() ?

sudip

> 
> patch is against linux-next 3.19.0-rc1 -next-20141226
> 
> Signed-off-by: Nicholas Mc Guire <der.herr@...r.at>
> ---
>  drivers/net/wimax/i2400m/driver.c |    1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/net/wimax/i2400m/driver.c b/drivers/net/wimax/i2400m/driver.c
> index 9c78090..0a6384e 100644
> --- a/drivers/net/wimax/i2400m/driver.c
> +++ b/drivers/net/wimax/i2400m/driver.c
> @@ -197,7 +197,6 @@ int i2400m_op_reset(struct wimax_dev *wimax_dev)
>  		result = -ETIMEDOUT;
>  	else if (result > 0)
>  		result = ctx.result;
> -	/* if result < 0, pass it on */
>  	mutex_lock(&i2400m->init_mutex);
>  	i2400m->reset_ctx = NULL;
>  	mutex_unlock(&i2400m->init_mutex);
> -- 
> 1.7.10.4
> 
> --
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