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authorTimothy S. Nelson <wayland@wayland.id.au>2009-01-30 06:12:47 +1100
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-02-04 16:58:41 -0800
commit97c44836cdec1ea713a15d84098a1a908157e68f (patch)
treebc544c64ed8eeb3feb2f0b210ae7db04a40e1bae /drivers
parent3419c75e15f82c3ab09bd944fddbde72c9e4b3ea (diff)
downloadlinux-97c44836cdec1ea713a15d84098a1a908157e68f.tar.bz2
PCI: return error on failure to read PCI ROMs
This patch makes the ROM reading code return an error to user space if the size of the ROM read is equal to 0. The patch also emits a warnings if the contents of the ROM are invalid, and documents the effects of the "enable" file on ROM reading. Signed-off-by: Timothy S. Nelson <wayland@wayland.id.au> Acked-by: Alex Villacis-Lasso <a_villacis@palosanto.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/pci-sysfs.c4
-rw-r--r--drivers/pci/rom.c8
2 files changed, 7 insertions, 5 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index db7ec14fa719..dfc4e0ddf241 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -768,8 +768,8 @@ pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
return -EINVAL;
rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
- if (!rom)
- return 0;
+ if (!rom || !size)
+ return -EIO;
if (off >= size)
count = 0;
diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index 132a78159b60..29cbe47f219f 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -63,7 +63,7 @@ void pci_disable_rom(struct pci_dev *pdev)
* The PCI window size could be much larger than the
* actual image size.
*/
-size_t pci_get_rom_size(void __iomem *rom, size_t size)
+size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size)
{
void __iomem *image;
int last_image;
@@ -72,8 +72,10 @@ size_t pci_get_rom_size(void __iomem *rom, size_t size)
do {
void __iomem *pds;
/* Standard PCI ROMs start out with these bytes 55 AA */
- if (readb(image) != 0x55)
+ if (readb(image) != 0x55) {
+ dev_err(&pdev->dev, "Invalid ROM contents\n");
break;
+ }
if (readb(image + 1) != 0xAA)
break;
/* get the PCI data structure and check its signature */
@@ -159,7 +161,7 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
* size is much larger than the actual size of the ROM.
* True size is important if the ROM is going to be copied.
*/
- *size = pci_get_rom_size(rom, *size);
+ *size = pci_get_rom_size(pdev, rom, *size);
return rom;
}