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Commit 8250a5c3 authored by Rob Clark's avatar Rob Clark Committed by Tony Lindgren
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omap2/3/4: mailbox: use dedicated work queue for handling mailbox rx interrupt 



keventd_wq is a shared work-queue, and should not be used when we
need fast deterministic response.  Instead mailbox driver should
use it's own private work-queue, with it's own thread, to ensure
that handling of RX interrupts are not delayed by other drivers.

The tasklet is still used for transmission of mbox messages.

Signed-off-by: default avatarRob Clark <rob@ti.com>
Signed-off-by: default avatarC A Subramaniam <subramaniam.ca@ti.com>
Signed-off-by: default avatarSuman Anna <s-anna@ti.com>
Acked-by: default avatarHiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 4499ce42

arch/arm/plat-omap/mailbox.c

+7 −1
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 


#include <plat/mailbox.h>



static struct workqueue_struct *mboxd;

static struct omap_mbox *mboxes;

static DEFINE_RWLOCK(mboxes_lock);
@@ -188,7 +189,7 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox) 
	/* no more messages in the fifo. clear IRQ source. */

	ack_mbox_irq(mbox, IRQ_RX);

nomem:

	schedule_work(&mbox->rxq->work);

	queue_work(mboxd, &mbox->rxq->work);

}



static irqreturn_t mbox_interrupt(int irq, void *p)
@@ -401,12 +402,17 @@ EXPORT_SYMBOL(omap_mbox_unregister); 


static int __init omap_mbox_init(void)

{

	mboxd = create_workqueue("mboxd");

	if (!mboxd)

		return -ENOMEM;



	return 0;

}

module_init(omap_mbox_init);



static void __exit omap_mbox_exit(void)

{

	destroy_workqueue(mboxd);

}

module_exit(omap_mbox_exit);