bcma: fix null pointer in bcma_core_pci_irq_ctl

pc could be null if hosttype != BCMA_HOSTTYPE_PCI.
If we are on a device without a pci core this function is called with
pc = null by b43 and brcmsmac. If the host type is PCI we have a pci
core as well and pc can not be null.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/bcma/driver_pci.c b/drivers/bcma/driver_pci.c
index 9a96f14c8f47..c32ebd537abe 100644
--- a/drivers/bcma/driver_pci.c
+++ b/drivers/bcma/driver_pci.c
@@ -232,17 +232,19 @@ void __devinit bcma_core_pci_init(struct bcma_drv_pci *pc)
 int bcma_core_pci_irq_ctl(struct bcma_drv_pci *pc, struct bcma_device *core,
                           bool enable)
 {
-        struct pci_dev *pdev = pc->core->bus->host_pci;
+        struct pci_dev *pdev;
         u32 coremask, tmp;
         int err = 0;
 
-        if (core->bus->hosttype != BCMA_HOSTTYPE_PCI) {
+        if (!pc || core->bus->hosttype != BCMA_HOSTTYPE_PCI) {
                 /* This bcma device is not on a PCI host-bus. So the IRQs are
                  * not routed through the PCI core.
                  * So we must not enable routing through the PCI core. */
                 goto out;
         }
 
+        pdev = pc->core->bus->host_pci;
+
         err = pci_read_config_dword(pdev, BCMA_PCI_IRQMASK, &tmp);
         if (err)
                 goto out;