tree 246e98ebdca86548ffcca9608b5c72899224c479
parent d85d76f39ef8f74c3ce4b2084bc1d56b90f808ce
author Finn Thain <fthain@telegraphics.com.au> 1509072324 -0400
committer Vegard Nossum <vegard.nossum@oracle.com> 1720426495 +0000

m68k/mac: Add mutual exclusion for IOP interrupt polling

The IOP interrupt handler iop_ism_irq() is used by the adb-iop
driver to poll for ADB request completion. Unfortunately, it is not
re-entrant. Fix the race condition by adding an iop_ism_irq_poll()
function with suitable mutual exclusion.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
(cherry picked from commit 92178fcabbcd39fc9ccd4e58ec4be83dd5323a46)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>