From 58e0543e8f355b32f0778a18858b255adb7402ae Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Mon, 5 Mar 2007 00:30:11 -0800 Subject: [PATCH] [PATCH] msi: support masking msi irqs without a mask bit For devices that do not support msi-x we only support 1 interrupt. Therefore we can disable that one interrupt by disabling the msi capability itself. If we leave the intx interrupts disabled while we have the msi capability disabled no interrupts should be delivered from that device. Devices with just the minimal msi support (and thus hitting this code path) include things like the intel e1000 nic, so it looks like is going to be a fairly common case and thus important to get right. Signed-off-by: Eric W. Biederman Cc: Michael Ellerman Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/pci/msi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index c43e7d22e180..01869b1782e4 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -85,6 +85,8 @@ static void msi_set_mask_bit(unsigned int irq, int flag) mask_bits &= ~(1); mask_bits |= flag; pci_write_config_dword(entry->dev, pos, mask_bits); + } else { + msi_set_enable(entry->dev, !flag); } break; case PCI_CAP_ID_MSIX: -- 2.20.1