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dde_linux: Limit number of merged IRQs

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This change makes Irq_context::_handle_one robust against misbehaving
IRQ handlers that always return IRQ_HANDLED, specifically dwc_otg.
This commit is contained in:
Norman Feske 2013-09-12 21:19:04 +02:00
parent 88f635b021
commit 0db203fb75
1 changed files with 9 additions and 6 deletions
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15
dde_linux/src/lib/usb/signal/irq.cc
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@ -97,16 +97,19 @@ class Irq_context : public Genode::List<Irq_context>::Element
bool handled = false; bool handled = false;
/* /*
* It might be that the next interrupt triggers right after the device has * It might be that the next interrupt triggers right after the
* acknowledged the IRQ * device has acknowledged the IRQ. To reduce per-IRQ context
* switches, we merge up to 'MAX_MERGED_IRQS' calls to the
* interrupt handler.
*/ */
do { enum { MAX_MERGED_IRQS = 8 };
for (unsigned i = 0; i < MAX_MERGED_IRQS; i++) {
if (h->handler(_irq, h->dev) != IRQ_HANDLED) if (h->handler(_irq, h->dev) != IRQ_HANDLED)
return handled; break;
handled = true; handled = true;
}
} while (true); return handled;
} }
/** /**