[PATCH] x86/apic: Avoid infinite loop in io_apic_level_ack_pending()

[Jason Andryuk]

io_apic_level_ack_pending() will end up in an infinite loop if
entry->pin == -1.  entry does not change, so it will keep reading -1.

Switched to breaking out of the loop.

Fixes: f821102450a1 ("x86: IRQ Migration logic enhancement.")
Signed-off-by: Jason Andryuk <jason.andr...@amd.com>
---
Noticed during code inspection.
---
 xen/arch/x86/io_apic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c
index 17e6827f4b..b21f0515f5 100644
--- a/xen/arch/x86/io_apic.c
+++ b/xen/arch/x86/io_apic.c
@@ -1715,7 +1715,7 @@ static bool io_apic_level_ack_pending(unsigned int irq)
 
         pin = entry->pin;
         if (pin == -1)
-            continue;
+            break;
         reg = io_apic_read(entry->apic, 0x10 + pin*2);
         /* Is the remote IRR bit set? */
         if (reg & IO_APIC_REDIR_REMOTE_IRR) {
-- 
2.51.0