From: Stefan Wahren stefan.wahren@i2se.com
[ Upstream commit 7566f39dfdc11f8a97d5810c6e6295a88f97ef91 ]
Abort the probing of the camera driver in case there isn't a camera actually connected to the Raspberry Pi. This solution also avoids a NULL ptr dereference of mmal instance on driver unload.
Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.") Signed-off-by: Stefan Wahren stefan.wahren@i2se.com Reviewed-by: Nicolas Saenz Julienne nsaenzjulienne@suse.de Reviewed-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- .../vc04_services/bcm2835-camera/bcm2835-camera.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c index 377da037f31c..b521752d9aa0 100644 --- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c +++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c @@ -1849,6 +1849,12 @@ static int __init bm2835_mmal_init(void) num_cameras = get_num_cameras(instance, resolutions, MAX_BCM2835_CAMERAS); + + if (num_cameras < 1) { + ret = -ENODEV; + goto cleanup_mmal; + } + if (num_cameras > MAX_BCM2835_CAMERAS) num_cameras = MAX_BCM2835_CAMERAS;
@@ -1948,6 +1954,9 @@ static int __init bm2835_mmal_init(void) pr_info("%s: error %d while loading driver\n", BM2835_MMAL_MODULE_NAME, ret);
+cleanup_mmal: + vchiq_mmal_finalise(instance); + return ret; }