Commit 6ae4adf5 authored by Ard van Breemen's avatar Ard van Breemen Committed by Linus Torvalds

[PATCH] PCI: prevent down_read when pci_devices is empty

The pci_find_subsys gets called very early by obsolete ide setup parameters.
This is a bogus call since pci is not initialized yet, so the list is empty.
But in the mean time, interrupts get enabled by down_read.  This can result in
a kernel panic when the irq controller gets initialized.

This patch checks if the device list is empty before taking the semaphore, and
hence will not enable irq's.  Furthermore it will inform that it is called
while pci_devices is empty as a reminder that the ide code needs to be fixed.

The pci_get_subsys can get called in the same manner, and as such is patched
in the same manner.

[akpm@osdl.org: cleanups]
Signed-off-by: default avatarArd van Breemen <ard@telegraafnet.nl>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent a416aba6
......@@ -193,6 +193,18 @@ static struct pci_dev * pci_find_subsys(unsigned int vendor,
struct pci_dev *dev;
WARN_ON(in_interrupt());
/*
* pci_find_subsys() can be called on the ide_setup() path, super-early
* in boot. But the down_read() will enable local interrupts, which
* can cause some machines to crash. So here we detect and flag that
* situation and bail out early.
*/
if (unlikely(list_empty(&pci_devices))) {
printk(KERN_INFO "pci_find_subsys() called while pci_devices "
"is still empty\n");
return NULL;
}
down_read(&pci_bus_sem);
n = from ? from->global_list.next : pci_devices.next;
......@@ -259,6 +271,18 @@ pci_get_subsys(unsigned int vendor, unsigned int device,
struct pci_dev *dev;
WARN_ON(in_interrupt());
/*
* pci_get_subsys() can potentially be called by drivers super-early
* in boot. But the down_read() will enable local interrupts, which
* can cause some machines to crash. So here we detect and flag that
* situation and bail out early.
*/
if (unlikely(list_empty(&pci_devices))) {
printk(KERN_NOTICE "pci_get_subsys() called while pci_devices "
"is still empty\n");
return NULL;
}
down_read(&pci_bus_sem);
n = from ? from->global_list.next : pci_devices.next;
......
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