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PCI: call final fixups hot-added devices 

Final fixups are currently applied only at boot-time by
pci_apply_final_quirks(), which is an fs_initcall().  Hot-added devices
don't get these fixups, so they may not be completely initialized.

This patch makes us run final fixups for hot-added devices in
pci_bus_add_device() just before the new device becomes eligible for driver
binding.

This patch keeps the fs_initcall() for devices present at boot because we
do resource assignment between pci_bus_add_device and the fs_initcall(),
and we don't want to break any fixups that depend on that assignment.  This
is a design issue that may be addressed in the future -- any resource
assignment should be done *before* device_add().

[bhelgaas: changelog]
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Myron Stowe 2012-07-09 15:36:46 -06:00 committed by Bjorn Helgaas
parent 3274c8eb26
commit 735bff10c1
2 changed files with 22 additions and 0 deletions
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4
drivers/pci/bus.c
View File

@ -164,6 +164,10 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
int pci_bus_add_device(struct pci_dev *dev)
{
int retval;
extern bool pci_fixup_final_inited;
if (pci_fixup_final_inited)
pci_fixup_device(pci_fixup_final, dev);
retval = device_add(&dev->dev);
if (retval)
return retval;

18
drivers/pci/quirks.c
View File

@ -3028,6 +3028,22 @@ void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev)
}
EXPORT_SYMBOL(pci_fixup_device);
/*
* The global variable 'pci_fixup_final_inited' is being used as a interim
* solution for calling the final quirks only during hot-plug events (not
* during boot processing).
*
* When the boot path's PCI device setup sequencing is addressed, we can
* remove the instance, and usages of, 'pci_fixup_final_inited' along with
* removing 'fs_initcall_sync(pci_apply_final_quirks);' and end up with a
* single, uniform, solution that satisfies both the boot path and the
* various hot-plug event paths.
*
* ToDo: Remove 'pci_fixup_final_inited'
*/
bool pci_fixup_final_inited;
static int __init pci_apply_final_quirks(void)
{
struct pci_dev *dev = NULL;
@ -3058,6 +3074,8 @@ static int __init pci_apply_final_quirks(void)
pci_cache_line_size = pci_dfl_cache_line_size;
}
}
pci_fixup_final_inited = 1;
if (!pci_cache_line_size) {
printk(KERN_DEBUG "PCI: CLS %u bytes, default %u\n",
cls << 2, pci_dfl_cache_line_size << 2);