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;
 }