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drivers: net: cpsw: irq not disabled in cpsw isr in particular sequence 

In CPSW NAPI, after processing all interrupts IRQ is enabled and then book
keeping irq_enabled is updated. In random cases when a packet is transmitted
or received between processing packets and IRQ enabled, then just after
enabled IRQ and before irq_enabled is updated, ISR is called so IRQs are
not disabled as irq_enabled is still false and CPU gets locked in CPSW ISR.

By changing the sequence as update the irq_enabled and then enable IRQ
fixes the issue. This issue is not captured always as it is a timing issue
whether Tx or Rx IRQ is invoked between packet processing and enable IRQ.

Cc: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mugunthan V N 2013-05-02 01:52:11 +00:00 committed by David S. Miller
parent 376414945d
commit af5c6df704
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/ti/cpsw.c
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@ -555,8 +555,8 @@ static int cpsw_poll(struct napi_struct *napi, int budget)
cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX);
prim_cpsw = cpsw_get_slave_priv(priv, 0);
if (prim_cpsw->irq_enabled == false) {
cpsw_enable_irq(priv);
prim_cpsw->irq_enabled = true;
cpsw_enable_irq(priv);
}
}