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| author | Mugunthan V N <mugunthanvnm@ti.com> | 2013-05-02 01:52:11 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-05-02 20:52:04 (GMT) |
| commit | af5c6df704af46f2cfebea329887f3d70ccb7b3d (patch) | |
| tree | 1c7a55c1c4f52644467bd29f57b0079d5e021434 /lib/btree.c | |
| parent | 376414945d15aa636e65f7e773c1e398b7a21cb9 (diff) | |
| download | linux-af5c6df704af46f2cfebea329887f3d70ccb7b3d.tar.xz | |
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 'lib/btree.c')
0 files changed, 0 insertions, 0 deletions