linux-kernel - Re: [PATCH 1/1 try 2] V4L: rocket, switch sleep

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Date:	Mon, 08 Oct 2007 12:31:49 -0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH 1/1 try 2] V4L: rocket, switch sleep_on to completion

Hi Jiri,

The patch might be right, however, AFAIK, this has nothing to do with
V4L. Better to change the subject ;)

Cheers,
Mauro.

Em Seg, 2007-10-08 às 08:45 -0400, Jiri Slaby escreveu:
> rocket, switch sleep_on to completion
> 
> - sleep_on is deprecated and racy, use completion instead
> - also check retval of interruptible function and return ERESTARTSYS
>   eventually
> 
> Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> 
> ---
> commit db2ca3cf492a6a8a4578e6adb869e1a20558b84e
> tree 4f732e546579c3482db61cc6e5e34087d4815a4b
> parent 9936225b4a065eec6eccd9700a680cc840280fdb
> author Jiri Slaby <jirislaby@...il.com> Mon, 08 Oct 2007 14:44:04 +0200
> committer Jiri Slaby <jirislaby@...il.com> Mon, 08 Oct 2007 14:44:04 +0200
> 
>  drivers/char/rocket.c     |   12 ++++++++----
>  drivers/char/rocket_int.h |    7 +------
>  2 files changed, 9 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
> index 56cbba7..d790b08 100644
> --- a/drivers/char/rocket.c
> +++ b/drivers/char/rocket.c
> @@ -84,6 +84,7 @@
>  #include <linux/mutex.h>
>  #include <linux/ioport.h>
>  #include <linux/delay.h>
> +#include <linux/completion.h>
>  #include <linux/wait.h>
>  #include <linux/pci.h>
>  #include <asm/uaccess.h>
> @@ -650,7 +651,7 @@ static void init_r_port(int board, int aiop, int chan, struct pci_dev *pci_dev)
>  	info->closing_wait = 3000;
>  	info->close_delay = 50;
>  	init_waitqueue_head(&info->open_wait);
> -	init_waitqueue_head(&info->close_wait);
> +	init_completion(&info->close_wait);
>  	info->flags &= ~ROCKET_MODE_MASK;
>  	switch (pc104[board][line]) {
>  	case 422:
> @@ -878,7 +879,8 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
>  	if (tty_hung_up_p(filp))
>  		return ((info->flags & ROCKET_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
>  	if (info->flags & ROCKET_CLOSING) {
> -		interruptible_sleep_on(&info->close_wait);
> +		if (wait_for_completion_interruptible(&info->close_wait))
> +			return -ERESTARTSYS;
>  		return ((info->flags & ROCKET_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
>  	}
>  
> @@ -983,8 +985,10 @@ static int rp_open(struct tty_struct *tty, struct file *filp)
>  		return -ENOMEM;
>  
>  	if (info->flags & ROCKET_CLOSING) {
> -		interruptible_sleep_on(&info->close_wait);
> +		retval = wait_for_completion_interruptible(&info->close_wait);
>  		free_page(page);
> +		if (retval)
> +			return retval;
>  		return ((info->flags & ROCKET_HUP_NOTIFY) ? -EAGAIN : -ERESTARTSYS);
>  	}
>  
> @@ -1176,7 +1180,7 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
>  	}
>  	info->flags &= ~(ROCKET_INITIALIZED | ROCKET_CLOSING | ROCKET_NORMAL_ACTIVE);
>  	tty->closing = 0;
> -	wake_up_interruptible(&info->close_wait);
> +	complete_all(&info->close_wait);
>  	atomic_dec(&rp_num_ports_open);
>  
>  #ifdef ROCKET_DEBUG_OPEN
> diff --git a/drivers/char/rocket_int.h b/drivers/char/rocket_int.h
> index b4c53df..55b8f2d 100644
> --- a/drivers/char/rocket_int.h
> +++ b/drivers/char/rocket_int.h
> @@ -1163,13 +1163,8 @@ struct r_port {
>  	int read_status_mask;
>  	int cps;
>  
> -#ifdef DECLARE_WAITQUEUE
>  	wait_queue_head_t open_wait;
> -	wait_queue_head_t close_wait;
> -#else
> -	struct wait_queue *open_wait;
> -	struct wait_queue *close_wait;
> -#endif
> +	struct completion close_wait;
>  	spinlock_t slock;
>  	struct mutex write_mtx;
>  };
> -
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-- 
Cheers,
Mauro

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