[PATCH] Be a bit defensive in quirk_nvidia_ck804() so we don't risk dereferencing a NULL pdev.

[Jesper Juhl <jesper.juhl@gmail.com>]

pci_get_slot() may return NULL if nothing was found. 
quirk_nvidia_ck804() does not check the value returned from pci_get_slot(),
so it may end up causing a NULL pointer deref.


Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
---

 drivers/pci/quirks.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 5b44838..d3dcbda 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1741,6 +1741,8 @@ static void __devinit quirk_nvidia_ck804
 	 * a single one having MSI is enough to be sure that MSI are supported.
 	 */
 	pdev = pci_get_slot(dev->bus, 0);
+	if (!pdev)
+		return;
 	if (dev->subordinate && !msi_ht_cap_enabled(dev)
 	    && !msi_ht_cap_enabled(pdev)) {
 		printk(KERN_WARNING "PCI: MSI quirk detected. "


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