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bna: fix interrupt handling

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This fix handles the case when IRQ handler is called (for shared IRQs)
even before the driver is ready to handle interrupts.

Signed-off-by: Debashis Dutt <ddutt@brocade.com>
Signed-off-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rasesh Mody 2010-10-05 15:46:04 +00:00 committed by David S. Miller
parent ebc0ffae5d
commit e2fa6f2ef6
1 changed files with 27 additions and 21 deletions
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48
drivers/net/bna/bnad.c
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@ -564,9 +564,11 @@ bnad_disable_rx_irq(struct bnad *bnad, struct bna_ccb *ccb)
static void
bnad_enable_rx_irq(struct bnad *bnad, struct bna_ccb *ccb)
{
spin_lock_irq(&bnad->bna_lock); /* Because of polling context */
unsigned long flags;
spin_lock_irqsave(&bnad->bna_lock, flags); /* Because of polling context */
bnad_enable_rx_irq_unsafe(ccb);
spin_unlock_irq(&bnad->bna_lock);
spin_unlock_irqrestore(&bnad->bna_lock, flags);
}
static void
@ -599,7 +601,7 @@ static irqreturn_t
bnad_msix_mbox_handler(int irq, void *data)
{
u32 intr_status;
unsigned long flags;
unsigned long flags;
struct net_device *netdev = data;
struct bnad *bnad;
@ -630,13 +632,15 @@ bnad_isr(int irq, void *data)
struct bnad_rx_info *rx_info;
struct bnad_rx_ctrl *rx_ctrl;
spin_lock_irqsave(&bnad->bna_lock, flags);
if (unlikely(test_bit(BNAD_RF_MBOX_IRQ_DISABLED, &bnad->run_flags)))
return IRQ_NONE;
bna_intr_status_get(&bnad->bna, intr_status);
if (!intr_status) {
spin_unlock_irqrestore(&bnad->bna_lock, flags);
if (unlikely(!intr_status))
return IRQ_NONE;
}
spin_lock_irqsave(&bnad->bna_lock, flags);
if (BNA_IS_MBOX_ERR_INTR(intr_status)) {
bna_mbox_handler(&bnad->bna, intr_status);
@ -672,11 +676,10 @@ bnad_enable_mbox_irq(struct bnad *bnad)
{
int irq = BNAD_GET_MBOX_IRQ(bnad);
if (!(bnad->cfg_flags & BNAD_CF_MSIX))
return;
if (test_and_clear_bit(BNAD_RF_MBOX_IRQ_DISABLED, &bnad->run_flags))
enable_irq(irq);
if (bnad->cfg_flags & BNAD_CF_MSIX)
enable_irq(irq);
BNAD_UPDATE_CTR(bnad, mbox_intr_enabled);
}
@ -689,11 +692,11 @@ bnad_disable_mbox_irq(struct bnad *bnad)
{
int irq = BNAD_GET_MBOX_IRQ(bnad);
if (!(bnad->cfg_flags & BNAD_CF_MSIX))
return;
if (!test_and_set_bit(BNAD_RF_MBOX_IRQ_DISABLED, &bnad->run_flags))
disable_irq_nosync(irq);
if (bnad->cfg_flags & BNAD_CF_MSIX)
disable_irq_nosync(irq);
BNAD_UPDATE_CTR(bnad, mbox_intr_disabled);
}
@ -1045,14 +1048,12 @@ bnad_mbox_irq_free(struct bnad *bnad,
return;
spin_lock_irqsave(&bnad->bna_lock, flags);
bnad_disable_mbox_irq(bnad);
spin_unlock_irqrestore(&bnad->bna_lock, flags);
irq = BNAD_GET_MBOX_IRQ(bnad);
free_irq(irq, bnad->netdev);
spin_unlock_irqrestore(&bnad->bna_lock, flags);
kfree(intr_info->idl);
}
@ -1094,8 +1095,15 @@ bnad_mbox_irq_alloc(struct bnad *bnad,
sprintf(bnad->mbox_irq_name, "%s", BNAD_NAME);
/*
* Set the Mbox IRQ disable flag, so that the IRQ handler
* called from request_irq() for SHARED IRQs do not execute
*/
set_bit(BNAD_RF_MBOX_IRQ_DISABLED, &bnad->run_flags);
err = request_irq(irq, irq_handler, flags,
bnad->mbox_irq_name, bnad->netdev);
if (err) {
kfree(intr_info->idl);
intr_info->idl = NULL;
@ -1103,7 +1111,8 @@ bnad_mbox_irq_alloc(struct bnad *bnad,
}
spin_lock_irqsave(&bnad->bna_lock, flags);
bnad_disable_mbox_irq(bnad);
if (bnad->cfg_flags & BNAD_CF_MSIX)
disable_irq_nosync(irq);
spin_unlock_irqrestore(&bnad->bna_lock, flags);
return 0;
}
@ -1485,7 +1494,6 @@ bnad_stats_timer_start(struct bnad *bnad)
jiffies + msecs_to_jiffies(BNAD_STATS_TIMER_FREQ));
}
spin_unlock_irqrestore(&bnad->bna_lock, flags);
}
/*
@ -2170,7 +2178,6 @@ bnad_device_disable(struct bnad *bnad)
spin_unlock_irqrestore(&bnad->bna_lock, flags);
wait_for_completion(&bnad->bnad_completions.ioc_comp);
}
static int
@ -3108,7 +3115,6 @@ bnad_pci_probe(struct pci_dev *pdev,
spin_lock_irqsave(&bnad->bna_lock, flags);
bna_init(bna, bnad, &pcidev_info, &bnad->res_info[0]);
spin_unlock_irqrestore(&bnad->bna_lock, flags);
bnad->stats.bna_stats = &bna->stats;