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38 lines
1.0 KiB
38 lines
1.0 KiB
6 years ago
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From 93ed80181e0ce7b81bc88a67fabad1ad829fc460 Mon Sep 17 00:00:00 2001
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From: Frediano Ziglio <frediano.ziglio@citrix.com>
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Date: Wed, 2 Jul 2014 12:59:34 +0100
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Subject: [PATCH 1/1] Balance correctly IRQs reappearing
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If IRQ disappears and reappears later (this happens frequently for Xen)
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the IRQ is not balanced correctly due to overflow in irq_count (as the
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counter got smaller and difference cause overflow).
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Rescan if this happens fix the problem.
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Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com>
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---
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procinterrupts.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/procinterrupts.c b/procinterrupts.c
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index 6a6bdaa..3476473 100644
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--- a/procinterrupts.c
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+++ b/procinterrupts.c
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@@ -181,6 +181,14 @@ void parse_proc_interrupts(void)
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break;
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}
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+ /* IRQ removed and reinserted, need restart or this will
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+ * cause an overflow and IRQ won't be rebalanced again
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+ */
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+ if (count < info->irq_count) {
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+ need_rescan = 1;
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+ break;
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+ }
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+
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info->last_irq_count = info->irq_count;
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info->irq_count = count;
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--
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2.16.1
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