From: Fernando Guzman Lugo Date: Mon, 8 Feb 2010 19:35:40 +0000 (-0600) Subject: Mailbox: disable mailbox interrupt when request queue X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1ea5d6d18bf1d528ae1081b9176d69c00bd51fa2;p=linux-beck.git Mailbox: disable mailbox interrupt when request queue when blk_get_request fails to get the request it is returning without read the message from the mailbox fifo, then when it leaves the isr and interruption is trigger again and again and the workqueue which get elements from the request queue is never executed and the kernel is stuck and shows a softlockup message. Now the mailbox interrupt is disabled when request queue is full and enabled when it pop a elememt form the request queue. Signed-off-by: Fernando Guzman Lugo Signed-off-by: Hiroshi DOYU --- diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c index 986002b089fd..c3402165488d 100644 --- a/arch/arm/plat-omap/mailbox.c +++ b/arch/arm/plat-omap/mailbox.c @@ -32,6 +32,7 @@ static struct workqueue_struct *mboxd; static struct omap_mbox *mboxes; static DEFINE_RWLOCK(mboxes_lock); +static bool rq_full; static int mbox_configured; static DEFINE_MUTEX(mbox_configured_lock); @@ -141,6 +142,10 @@ static void mbox_rx_work(struct work_struct *work) while (1) { spin_lock_irqsave(q->queue_lock, flags); rq = blk_fetch_request(q); + if (rq_full) { + omap_mbox_enable_irq(mbox, IRQ_RX); + rq_full = false; + } spin_unlock_irqrestore(q->queue_lock, flags); if (!rq) break; @@ -178,8 +183,11 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox) while (!mbox_fifo_empty(mbox)) { rq = blk_get_request(q, WRITE, GFP_ATOMIC); - if (unlikely(!rq)) + if (unlikely(!rq)) { + omap_mbox_disable_irq(mbox, IRQ_RX); + rq_full = true; goto nomem; + } msg = mbox_fifo_read(mbox);