Bartlomiej Zolnierkiewicz wrote:
+ if (chip_type == HPT374 && (PCI_FUNC(dev->devfn) & 1)) { + struct pci_dev *dev1 = pci_get_slot(dev->bus, + dev->devfn - 1);
Can be NULL
Not really. This may not be called if it's NULL -- see hpt374_init_setup(). Maybe worth a comment though...
+ unsigned long io_base = pci_resource_start(dev1, 4);
Kaboom
That was a dud bomb. ;-)
What stops a hot unplug of a 374 from causing that to occur. I don't see
Pinned as in pci_get_device()? If so, see setup-ide.c:ide_scan_pcibus(). The IDE core does that for me.
ide_scan_pcibus() is used iff IDE is built-in.
Moreover pci_get_device() holds reference _only_ to the current PCI device (the reference count to @from PCI device is _always_ decremented).
Indeed... doesn't it look like a buglet in the IDE core?
where you have the other pci_dev pinned on a hotplug on a box set to scan the devices in reverse order
Function 1 will always be skipped, regardless of the scan order.
Yes, but init_chipset_hpt366() will still try to access Function 1
No! Re-read the code please: init_chipset_hpt366() won't be called for function 1 if that one is not detected, and only in this case it does function 0 access to read the saved f_CNT value.
even if earlier init_setup_hpt374() failed to obtain reference to it.
(yes its an extremely obscure case ;))
"Security through obscurity". :-)
Not in this case. :-)
Yeah, here we have another case. ;-)
Bart
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