Code that iterates over all standard PCI BARs typically uses PCI_STD_RESOURCE_END. However, it requires the "unusual" loop condition "i <= PCI_STD_RESOURCE_END" rather than something more standard like "i < PCI_STD_NUM_BARS".
This patch adds the definition PCI_STD_NUM_BARS which is equivalent to "PCI_STD_RESOURCE_END + 1". To iterate through all possible BARs, loop conditions changed to the *number* of BARs "i < PCI_STD_NUM_BARS", instead of the index of the last valid BAR "i <= PCI_STD_RESOURCE_END" or PCI_ROM_RESOURCE. The magic constant (6) is also replaced with new define PCI_STD_NUM_BARS. Signed-off-by: Denis Efremov <[email protected]> --- drivers/pci/pci-sysfs.c | 4 ++-- drivers/pci/pci.c | 13 +++++++------ drivers/pci/proc.c | 4 ++-- drivers/pci/quirks.c | 4 ++-- include/linux/pci.h | 2 +- include/uapi/linux/pci_regs.h | 1 + 6 files changed, 15 insertions(+), 13 deletions(-) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 965c72104150..3e26b8e03bd5 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1257,7 +1257,7 @@ static void pci_remove_resource_files(struct pci_dev *pdev) { int i; - for (i = 0; i < PCI_ROM_RESOURCE; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { struct bin_attribute *res_attr; res_attr = pdev->res_attr[i]; @@ -1328,7 +1328,7 @@ static int pci_create_resource_files(struct pci_dev *pdev) int retval; /* Expose the PCI resources from this device as files */ - for (i = 0; i < PCI_ROM_RESOURCE; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { /* skip empty resources */ if (!pci_resource_len(pdev, i)) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 1b27b5af3d55..7d543986026b 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -674,7 +674,7 @@ struct resource *pci_find_resource(struct pci_dev *dev, struct resource *res) { int i; - for (i = 0; i < PCI_ROM_RESOURCE; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { struct resource *r = &dev->resource[i]; if (r->start && resource_contains(r, res)) @@ -3768,7 +3768,7 @@ void pci_release_selected_regions(struct pci_dev *pdev, int bars) { int i; - for (i = 0; i < 6; i++) + for (i = 0; i < PCI_STD_NUM_BARS; i++) if (bars & (1 << i)) pci_release_region(pdev, i); } @@ -3779,7 +3779,7 @@ static int __pci_request_selected_regions(struct pci_dev *pdev, int bars, { int i; - for (i = 0; i < 6; i++) + for (i = 0; i < PCI_STD_NUM_BARS; i++) if (bars & (1 << i)) if (__pci_request_region(pdev, i, res_name, excl)) goto err_out; @@ -3827,7 +3827,7 @@ EXPORT_SYMBOL(pci_request_selected_regions_exclusive); void pci_release_regions(struct pci_dev *pdev) { - pci_release_selected_regions(pdev, (1 << 6) - 1); + pci_release_selected_regions(pdev, (1 << PCI_STD_NUM_BARS) - 1); } EXPORT_SYMBOL(pci_release_regions); @@ -3846,7 +3846,8 @@ EXPORT_SYMBOL(pci_release_regions); */ int pci_request_regions(struct pci_dev *pdev, const char *res_name) { - return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name); + return pci_request_selected_regions(pdev, + ((1 << PCI_STD_NUM_BARS) - 1), res_name); } EXPORT_SYMBOL(pci_request_regions); @@ -3868,7 +3869,7 @@ EXPORT_SYMBOL(pci_request_regions); int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) { return pci_request_selected_regions_exclusive(pdev, - ((1 << 6) - 1), res_name); + ((1 << PCI_STD_NUM_BARS) - 1), res_name); } EXPORT_SYMBOL(pci_request_regions_exclusive); diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index fe7fe678965b..cb61ec2c24e8 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -248,13 +248,13 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) } /* Make sure the caller is mapping a real resource for this device */ - for (i = 0; i < PCI_ROM_RESOURCE; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { if (dev->resource[i].flags & res_bit && pci_mmap_fits(dev, i, vma, PCI_MMAP_PROCFS)) break; } - if (i >= PCI_ROM_RESOURCE) + if (i >= PCI_STD_NUM_BARS) return -ENODEV; if (fpriv->mmap_state == pci_mmap_mem && diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 44c4ae1abd00..998454b0ae8d 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -475,7 +475,7 @@ static void quirk_extend_bar_to_page(struct pci_dev *dev) { int i; - for (i = 0; i <= PCI_STD_RESOURCE_END; i++) { + for (i = 0; i < PCI_STD_NUM_BARS; i++) { struct resource *r = &dev->resource[i]; if (r->flags & IORESOURCE_MEM && resource_size(r) < PAGE_SIZE) { @@ -1810,7 +1810,7 @@ static void quirk_alder_ioapic(struct pci_dev *pdev) * The next five BARs all seem to be rubbish, so just clean * them out. */ - for (i = 1; i < 6; i++) + for (i = 1; i < PCI_STD_NUM_BARS; i++) memset(&pdev->resource[i], 0, sizeof(pdev->resource[i])); } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EESSC, quirk_alder_ioapic); diff --git a/include/linux/pci.h b/include/linux/pci.h index 82e4cd1b7ac3..cf7d16305243 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -76,7 +76,7 @@ enum pci_mmap_state { enum { /* #0-5: standard PCI resources */ PCI_STD_RESOURCES, - PCI_STD_RESOURCE_END = 5, + PCI_STD_RESOURCE_END = PCI_STD_RESOURCES + PCI_STD_NUM_BARS - 1, /* #6: expansion ROM resource */ PCI_ROM_RESOURCE, diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index f28e562d7ca8..68b571d491eb 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -34,6 +34,7 @@ * of which the first 64 bytes are standardized as follows: */ #define PCI_STD_HEADER_SIZEOF 64 +#define PCI_STD_NUM_BARS 6 /* Number of standard BARs */ #define PCI_VENDOR_ID 0x00 /* 16 bits */ #define PCI_DEVICE_ID 0x02 /* 16 bits */ #define PCI_COMMAND 0x04 /* 16 bits */ -- 2.21.0
