Commit 8435b027 authored by Andre Detsch's avatar Andre Detsch Committed by Benjamin Herrenschmidt
Browse files

powerpc/pci: Fix regression in powerpc MSI-X

Patch f598282f

 exposed a problem in
powerpc MSI-X functionality, making network interfaces such as ixgbe
and cxgb3 stop to work when MSI-X is enabled. RX interrupts were not
being generated.

The problem was caused because MSI irq was not being effectively
unmasked after device initialization.
Signed-off-by: default avatarAndre Detsch <>
Signed-off-by: default avatarMichael Ellerman <>
Signed-off-by: default avatarBenjamin Herrenschmidt <>
parent 978d7eb3
......@@ -432,8 +432,6 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
/* Read config space back so we can restore after reset */
read_msi_msg(virq, &msg);
entry->msg = msg;
return 0;
......@@ -18,6 +18,7 @@
#include <linux/init.h>
#include <linux/radix-tree.h>
#include <linux/cpu.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <asm/firmware.h>
......@@ -219,6 +220,14 @@ static void xics_unmask_irq(unsigned int virq)
static unsigned int xics_startup(unsigned int virq)
* The generic MSI code returns with the interrupt disabled on the
* card, using the MSI mask bits. Firmware doesn't appear to unmask
* at that level, so we do it here by hand.
if (irq_to_desc(virq)->msi_desc)
/* unmask it */
return 0;
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