viacam: Don't explode if pci_find_bus() returns NULL

[firefly-linux-kernel-4.4.55.git] / drivers / media / video / via-camera.c

diff --git a/drivers/media/video/via-camera.c b/drivers/media/video/via-camera.c
index 85d3048c1d679dcc83cdf6a7afb8d0f6af1f15c2..bb7f17f2a33c20452ce9d6d37bbb29990215fe07 100644 (file)
--- a/drivers/media/video/via-camera.c
+++ b/drivers/media/video/via-camera.c
@@ -1332,6 +1332,8 @@ static __devinit bool viacam_serial_is_enabled(void)
        struct pci_bus *pbus = pci_find_bus(0, 0);
        u8 cbyte;
 
+       if (!pbus)
+               return false;
        pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN,
                        VIACAM_SERIAL_CREG, &cbyte);
        if ((cbyte & VIACAM_SERIAL_BIT) == 0)