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

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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>
This commit is contained in:
Yijing Wang 2014-07-08 10:08:55 +08:00 committed by Bjorn Helgaas
parent 4cc901613b
commit a281b788d6
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/msi.c
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@ -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);
}
}