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m68k/mac: Add mutual exclusion for IOP interrupt polling

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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>
This commit is contained in:
Finn Thain
2017-10-26 22:45:24 -04:00
committed by Geert Uytterhoeven
parent 8ee90c5c3f
commit 92178fcabb
3 changed files with 11 additions and 3 deletions
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9
arch/m68k/mac/iop.c
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@@ -598,3 +598,12 @@ irqreturn_t iop_ism_irq(int irq, void *dev_id)
}
return IRQ_HANDLED;
}
void iop_ism_irq_poll(uint iop_num)
{
unsigned long flags;
local_irq_save(flags);
iop_ism_irq(0, (void *)iop_num);
local_irq_restore(flags);
}