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[Qemu-devel] [PATCH] pci: Don't call pci_irq_handler() for a negative in
From: |
Benjamin Herrenschmidt |
Subject: |
[Qemu-devel] [PATCH] pci: Don't call pci_irq_handler() for a negative intx |
Date: |
Sun, 05 Jul 2015 09:28:28 +1000 |
Under some circumstances, pci_intx() can return -1 (when the interrupt
pin in the config space is 0 which normally means no interrupt).
I have seen cases of pci_set_irq() being called on such devices, in
turn causing pci_irq_handler() to be called with "-1" as an argument
which doesn't seem like a terribly good idea.
Signed-off-by: Benjamin Herrenschmidt <address@hidden>
---
hw/pci/pci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 8185bbc..eea6f5d 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1281,7 +1281,9 @@ qemu_irq pci_allocate_irq(PCIDevice *pci_dev)
void pci_set_irq(PCIDevice *pci_dev, int level)
{
int intx = pci_intx(pci_dev);
- pci_irq_handler(pci_dev, intx, level);
+ if (intx >= 0) {
+ pci_irq_handler(pci_dev, intx, level);
+ }
}
/* Special hooks used by device assignment */
- [Qemu-devel] [PATCH] pci: Don't call pci_irq_handler() for a negative intx,
Benjamin Herrenschmidt <=