If we can tell that a device isn't working correctly, we should tell
the user to make debugging easier. Otherwise, it can take a lot of
work to determine whether the problem is in the driver, PCMCIA, PCI,
hardware, etc., as in http://bugzilla.kernel.org/show_bug.cgi?id=12006
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
pci_read_config_dword(dev, pos, &sz);
pci_write_config_dword(dev, pos, l);
pci_read_config_dword(dev, pos, &sz);
pci_write_config_dword(dev, pos, l);
+ if (!sz)
+ goto fail; /* BAR not implemented */
+
/*
* All bits set in sz means the device isn't working properly.
/*
* All bits set in sz means the device isn't working properly.
- * If the BAR isn't implemented, all bits must be 0. If it's a
- * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
- * 1 must be clear.
+ * If it's a memory BAR or a ROM, bit 0 must be clear; if it's
+ * an io BAR, bit 1 must be clear.
- if (!sz || sz == 0xffffffff)
+ if (sz == 0xffffffff) {
+ dev_err(&dev->dev, "reg %x: invalid size %#x; broken device?\n",
+ pos, sz);
/*
* I don't know how l can have all bits set. Copied from old code.
/*
* I don't know how l can have all bits set. Copied from old code.
- sz = pci_size(l, sz, mask);
+ u32 size = pci_size(l, sz, mask);
+ if (!size) {
+ dev_err(&dev->dev, "reg %x: invalid size "
+ "(l %#x sz %#x mask %#x); broken device?",
+ pos, l, sz, mask);
dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
}
dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
}