[Xen-devel] [PATCH] xen: events: do not free legacy IRQs

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

c514d00c8057 "xen: events: add xen_allocate_irq_{dynamic, gsi} and
xen_free_irq" correctly avoids reallocating legacy IRQs (which are
managed by the arch core) but erroneously did not prevent them being
freed.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 drivers/xen/events.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index ff044e0..eb7d47f 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -434,6 +434,10 @@ static int xen_allocate_irq_gsi(unsigned gsi)
 
 static void xen_free_irq(unsigned irq)
 {
+       /* Legacy IRQ descriptors are managed by the arch. */
+       if (irq < NR_IRQS_LEGACY)
+               return irq;
+
        irq_free_desc(irq);
 }
 
-- 
1.5.6.5


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