PCI/MSI: Use irq_get_msi_desc() to simplify code

Use irq_get_msi_desc() to get MSI IRQ related msi_desc directly instead of
searching the dev->msi_list.

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

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 84da13c00a34c00ef3b8e8eabcb43c771767d4d6..5a40516444f33d4c46f6067e089434b9e7840cda 100644 (file)
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -487,7 +487,6 @@ EXPORT_SYMBOL_GPL(pci_restore_msi_state);
 static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
                             char *buf)
 {
-       struct pci_dev *pdev = to_pci_dev(dev);
        struct msi_desc *entry;
        unsigned long irq;
        int retval;
@@ -496,12 +495,11 @@ static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
        if (retval)
                return retval;
 
-       list_for_each_entry(entry, &pdev->msi_list, list) {
-               if (entry->irq == irq) {
-                       return sprintf(buf, "%s\n",
-                                      entry->msi_attrib.is_msix ? "msix" : "msi");
-               }
-       }
+       entry = irq_get_msi_desc(irq);
+       if (entry)
+               return sprintf(buf, "%s\n",
+                               entry->msi_attrib.is_msix ? "msix" : "msi");
+
        return -ENODEV;
 }