[PATCH 01/10] [PATCH] yenta oops fix

Chris Wright
2005-09-30T02:26:39Z

[-- Attachment #1: yenta-oops-fix.patch --]
[-- Type: text/plain, Size: 1580 bytes --]

-stable review patch. If anyone has any objections, please let us know.
------------------

In some cases, especially on modern laptops with a lot of PCI and
cardbus bridges, we're unable to assign correct secondary/subordinate
bus numbers to all cardbus bridges due to BIOS limitations unless
we are using "pci=assign-busses" boot option.
So some cardbus controllers may not have attached subordinate pci_bus
structure, and yenta driver must cope with it - just ignore such cardbus
bridges.

For example, see https://bugzilla.novell.com/show_bug.cgi?id=113778

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Chris Wright <chrisw@osdl.org>
---
drivers/pcmcia/yenta_socket.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletion(-)

Index: linux-2.6.13.y/drivers/pcmcia/yenta_socket.c
===================================================================
--- linux-2.6.13.y.orig/drivers/pcmcia/yenta_socket.c
+++ linux-2.6.13.y/drivers/pcmcia/yenta_socket.c
@@ -976,7 +976,18 @@ static int __devinit yenta_probe (struct
{
struct yenta_socket *socket;
int ret;
-
+
+ /*
+ * If we failed to assign proper bus numbers for this cardbus
+ * controller during PCI probe, its subordinate pci_bus is NULL.
+ * Bail out if so.
+ */
+ if (!dev->subordinate) {
+ printk(KERN_ERR "Yenta: no bus associated with %s! "
+ "(try 'pci=assign-busses')\n", pci_name(dev));
+ return -ENODEV;
+ }
+
socket = kmalloc(sizeof(struct yenta_socket), GFP_KERNEL);
if (!socket)
return -ENOMEM;

--