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PCI: complain about devices that seem to be broken

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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>
This commit is contained in:
Bjorn Helgaas 2010-03-19 14:56:27 -06:00 committed by Jesse Barnes
parent e1944c6b0f
commit c519a5a7da
1 changed files with 16 additions and 7 deletions
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23
drivers/pci/probe.c
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@ -174,14 +174,19 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
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.
* 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);
goto fail;
}
/*
* I don't know how l can have all bits set. Copied from old code.
@ -244,13 +249,17 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
pos, res);
}
} else {
sz = pci_size(l, sz, mask);
u32 size = pci_size(l, sz, mask);
if (!sz)
if (!size) {
dev_err(&dev->dev, "reg %x: invalid size "
"(l %#x sz %#x mask %#x); broken device?",
pos, l, sz, mask);
goto fail;
}
res->start = l;
res->end = l + sz;
res->end = l + size;
dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
}