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| author | Mugunthan V N <mugunthanvnm@ti.com> | 2013-05-02 01:52:11 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-05-02 16:52:04 -0400 |
| commit | af5c6df704af46f2cfebea329887f3d70ccb7b3d (patch) | |
| tree | 1c7a55c1c4f52644467bd29f57b0079d5e021434 /drivers | |
| parent | 376414945d15aa636e65f7e773c1e398b7a21cb9 (diff) | |
| download | linux-stable-af5c6df704af46f2cfebea329887f3d70ccb7b3d.tar.gz linux-stable-af5c6df704af46f2cfebea329887f3d70ccb7b3d.tar.bz2 linux-stable-af5c6df704af46f2cfebea329887f3d70ccb7b3d.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/ti/cpsw.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index 59c43918883e..21a5b291b4b3 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -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); } } |