Commit a281b788 authored Jul 08, 2014 by Yijing Wang Committed by Bjorn Helgaas Jul 16, 2014

PCI/MSI: Retrieve first MSI IRQ from msi_desc rather than pci_dev



Retrieve the first MSI IRQ to compute the MSI index from struct msi_desc
rather than the struct pci_dev to avoid an additional memory access.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

parent 4cc90161

drivers/pci/msi.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -235,7 +235,7 @@ static void msi_set_mask_bit(struct irq_data *data, u32 flag)
		msix_mask_irq(desc, flag);
		readl(desc->mask_base); /* Flush write to device */
		} else {
		unsigned offset = data->irq - desc->dev->irq;
		unsigned offset = data->irq - desc->irq;
		msi_mask_irq(desc, 1 << offset, flag << offset);
		}
		}