PCI: Use BAR index in sysfs attr->private instead of resource pointer

We store the pointer, and then on *every* use of it we loop over the
device's resources to find out the index.  That's kind of silly.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index cb04bc2..534844d 100644 (file)
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1017,26 +1017,20 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
                             struct vm_area_struct *vma, int write_combine)
 {
        struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
-       struct resource *res = attr->private;
+       int bar = (unsigned long)attr->private;
        enum pci_mmap_state mmap_type;
        resource_size_t start, end;
-       int i;
-
-       for (i = 0; i < PCI_ROM_RESOURCE; i++)
-               if (res == &pdev->resource[i])
-                       break;
-       if (i >= PCI_ROM_RESOURCE)
-               return -ENODEV;
+       struct resource *res = &pdev->resource[bar];
 
        if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
                return -EINVAL;
 
-       if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
+       if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS)) {
                WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
                        current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
-                       pci_name(pdev), i,
-                       (u64)pci_resource_start(pdev, i),
-                       (u64)pci_resource_len(pdev, i));
+                       pci_name(pdev), bar,
+                       (u64)pci_resource_start(pdev, bar),
+                       (u64)pci_resource_len(pdev, bar));
                return -EINVAL;
        }
 
@@ -1044,7 +1038,7 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
         * from /proc/bus/pci/ which is a "user visible" value. If this is
         * different from the resource itself, arch will do necessary fixup.
         */
-       pci_resource_to_user(pdev, i, res, &start, &end);
+       pci_resource_to_user(pdev, bar, res, &start, &end);
        vma->vm_pgoff += start >> PAGE_SHIFT;
        mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
        return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
@@ -1069,22 +1063,18 @@ static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
                               loff_t off, size_t count, bool write)
 {
        struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
-       struct resource *res = attr->private;
+       int bar = (unsigned long)attr->private;
+       struct resource *res;
        unsigned long port = off;
-       int i;
 
-       for (i = 0; i < PCI_ROM_RESOURCE; i++)
-               if (res == &pdev->resource[i])
-                       break;
-       if (i >= PCI_ROM_RESOURCE)
-               return -ENODEV;
+       res = &pdev->resource[bar];
 
-       port += pci_resource_start(pdev, i);
+       port += pci_resource_start(pdev, bar);
 
-       if (port > pci_resource_end(pdev, i))
+       if (port > pci_resource_end(pdev, bar))
                return 0;
 
-       if (port + count - 1 > pci_resource_end(pdev, i))
+       if (port + count - 1 > pci_resource_end(pdev, bar))
                return -EINVAL;
 
        switch (count) {
@@ -1186,7 +1176,7 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
        res_attr->attr.name = res_attr_name;
        res_attr->attr.mode = S_IRUSR | S_IWUSR;
        res_attr->size = pci_resource_len(pdev, num);
-       res_attr->private = &pdev->resource[num];
+       res_attr->private = (void *)(unsigned long)num;
        retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
        if (retval)
                kfree(res_attr);