tree 4ff705ce7b3b9b51563777b584d90cf4d0b1a348
parent 2ef822c55371b20548d4f58193c580407a5d738d
author Benjamin Herrenschmidt <benh@kernel.crashing.org> 1334787408 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1335143068 +1000

powerpc/pmac: Don't add_timer() twice

If the interrupt and the timeout happen roughly at the same
time, we can get into a situation where the timer function
is run while the interrupt has already been processed. In
this case, the timer function might end up doing an add_timer
on an already pending timer, causing a BUG_ON() to trigger.

Instead, just skip the whole timeout operation if we see that
the timer is pending. The spinlock ensures that the only way
that happens is if we already started a new operation and thus
the timeout can be ignored.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>