[PATCH v3 1/5] OMAP: mailbox: change full flag per mailbox queue instead of global

[Cousson, Benoit]

On 11/18/2010 8:15 PM, Kanigeri, Hari wrote:
> From: Fernando Guzman Lugo<x0095840 at ti.com>
>
> As pointed by Ohad Ben-Cohen, the variable rq_full flag is a
> global variable, so if there are multiple mailbox users
> there will be conflics. Now there is a full flag per
> mailbox queue.
>
> Version 2:
> - Rebase to the latest.
> Version 3:

You should not put the patch revisions here, because it will stay in the 
changelog when it will be in GIT.
You'd better put that in the cover-letter or after the ---.

Everything after --- will not be taken into account in the changelog.

Regards,
Benoit

> - Remove spin_lock protection. When the full flag is
> true the interrupt for that mailbox is disabled. So there
> is no race condition if full flag is modified before
> calling omap_mbox_enable_irq.
>
> Reported-by: Ohad Ben-Cohen<ohad at wizery.com>
> Signed-off-by: Fernando Guzman Lugo<x0095840 at ti.com>
> Signed-off-by: Hari Kanigeri<h-kanigeri2 at ti.com>
> ---
>   arch/arm/plat-omap/include/plat/mailbox.h |    1 +
>   arch/arm/plat-omap/mailbox.c              |    7 +++++--
>   2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/plat-omap/include/plat/mailbox.h b/arch/arm/plat-omap/include/plat/mailbox.h
> index 9976565..13f2ef3 100644
> --- a/arch/arm/plat-omap/include/plat/mailbox.h
> +++ b/arch/arm/plat-omap/include/plat/mailbox.h
> @@ -48,6 +48,7 @@ struct omap_mbox_queue {
>   	struct tasklet_struct	tasklet;
>   	int	(*callback)(void *);
>   	struct omap_mbox	*mbox;
> +	bool full;
>   };
>
>   struct omap_mbox {
> diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
> index d2fafb8..9ce3570 100644
> --- a/arch/arm/plat-omap/mailbox.c
> +++ b/arch/arm/plat-omap/mailbox.c
> @@ -33,7 +33,6 @@
>
>   static struct workqueue_struct *mboxd;
>   static struct omap_mbox **mboxes;
> -static bool rq_full;
>
>   static int mbox_configured;
>   static DEFINE_MUTEX(mbox_configured_lock);
> @@ -148,6 +147,10 @@ static void mbox_rx_work(struct work_struct *work)
>
>   		if (mq->callback)
>   			mq->callback((void *)msg);
> +		if (mq->full) {
> +			mq->full = false;
> +			omap_mbox_enable_irq(mq->mbox, IRQ_RX);
> +		}
>   	}
>   }
>
> @@ -170,7 +173,7 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox)
>   	while (!mbox_fifo_empty(mbox)) {
>   		if (unlikely(kfifo_avail(&mq->fifo)<  sizeof(msg))) {
>   			omap_mbox_disable_irq(mbox, IRQ_RX);
> -			rq_full = true;
> +			mq->full = true;
>   			goto nomem;
>   		}
>