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>
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4cc901613b
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a281b788d6
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@ -235,7 +235,7 @@ static void msi_set_mask_bit(struct irq_data *data, u32 flag)
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msix_mask_irq(desc, flag);
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readl(desc->mask_base); /* Flush write to device */
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} else {
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unsigned offset = data->irq - desc->dev->irq;
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unsigned offset = data->irq - desc->irq;
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msi_mask_irq(desc, 1 << offset, flag << offset);
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}
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}
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