[PATCH v2] [media] media-device: handle errors at media_device_init()
Mauro Carvalho Chehab
mchehab at osg.samsung.com
Tue Dec 15 04:22:46 PST 2015
Changeset 43ac4401dca9 ("[media] media-device: split media
initialization and registration") broke media device register
into two separate functions, but introduced a BUG_ON() and
made media_device_init() void. It also introduced several
warnings.
Instead of adding BUG_ON(), let's revert to WARN_ON() and fix
the init code in a way that, if something goes wrong during
device init, driver probe will fail without causing the Kernel
to BUG.
Signed-off-by: Mauro Carvalho Chehab <mchehab at osg.samsung.com>
---
drivers/media/media-device.c | 8 ++++---
drivers/media/platform/exynos4-is/media-dev.c | 7 +++++-
drivers/media/platform/omap3isp/isp.c | 9 ++++++--
drivers/media/platform/s3c-camif/camif-core.c | 4 +++-
drivers/media/platform/vsp1/vsp1_drv.c | 7 +++++-
drivers/media/platform/xilinx/xilinx-vipp.c | 7 +++++-
drivers/media/usb/au0828/au0828-core.c | 26 +++++++++++++++++----
drivers/media/usb/cx231xx/cx231xx-cards.c | 23 +++++++++++++++----
drivers/media/usb/dvb-usb-v2/dvb_usb_core.c | 33 +++++++++++++++++++--------
drivers/media/usb/dvb-usb/dvb-usb-dvb.c | 32 +++++++++++++++++++-------
drivers/media/usb/siano/smsusb.c | 6 ++++-
drivers/media/usb/uvc/uvc_driver.c | 3 ++-
include/media/media-device.h | 2 +-
13 files changed, 128 insertions(+), 39 deletions(-)
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 76e2b2f3a15f..34621605eed7 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -625,10 +625,10 @@ EXPORT_SYMBOL_GPL(media_device_unregister_entity);
* - dev must point to the parent device
* - model must be filled with the device model name
*/
-void media_device_init(struct media_device *mdev)
+int __must_check media_device_init(struct media_device *mdev)
{
-
- BUG_ON(mdev->dev == NULL);
+ if (WARN_ON(mdev->dev == NULL))
+ return -EINVAL;
INIT_LIST_HEAD(&mdev->entities);
INIT_LIST_HEAD(&mdev->interfaces);
@@ -638,6 +638,8 @@ void media_device_init(struct media_device *mdev)
mutex_init(&mdev->graph_mutex);
dev_dbg(mdev->dev, "Media device initialized\n");
+
+ return 0;
}
EXPORT_SYMBOL_GPL(media_device_init);
diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index 27663dd45294..4fea0037dade 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -1353,7 +1353,11 @@ static int fimc_md_probe(struct platform_device *pdev)
return ret;
}
- media_device_init(&fmd->media_dev);
+ ret = media_device_init(&fmd->media_dev);
+ if (ret < 0) {
+ v4l2_err(v4l2_dev, "Failed to register media device: %d\n", ret);
+ goto err_v4l2_dev;
+ }
ret = fimc_md_get_clocks(fmd);
if (ret)
@@ -1424,6 +1428,7 @@ err_m_ent:
fimc_md_unregister_entities(fmd);
err_md:
media_device_cleanup(&fmd->media_dev);
+err_v4l2_dev:
v4l2_device_unregister(&fmd->v4l2_dev);
return ret;
}
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 942b189c0eca..347bfdd8ce65 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -1876,7 +1876,12 @@ static int isp_register_entities(struct isp_device *isp)
sizeof(isp->media_dev.model));
isp->media_dev.hw_revision = isp->revision;
isp->media_dev.link_notify = isp_pipeline_link_notify;
- media_device_init(&isp->media_dev);
+ ret = media_device_init(&isp->media_dev);
+ if (ret < 0) {
+ dev_err(isp->dev, "%s: Media device registration failed (%d)\n",
+ __func__, ret);
+ return ret;
+ }
isp->v4l2_dev.mdev = &isp->media_dev;
ret = v4l2_device_register(isp->dev, &isp->v4l2_dev);
@@ -2361,7 +2366,7 @@ static int isp_subdev_notifier_complete(struct v4l2_async_notifier *async)
}
}
- ret = v4l2_device_register_subdev_nodes(&isp->v4l2_dev);
+ ret = v4l2_device_register_subdev_nodes(v4l2_dev);
if (ret < 0)
return ret;
diff --git a/drivers/media/platform/s3c-camif/camif-core.c b/drivers/media/platform/s3c-camif/camif-core.c
index ea02b7ef2119..6e6ad152adbc 100644
--- a/drivers/media/platform/s3c-camif/camif-core.c
+++ b/drivers/media/platform/s3c-camif/camif-core.c
@@ -328,7 +328,9 @@ static int camif_media_dev_init(struct camif_dev *camif)
if (ret < 0)
return ret;
- media_device_init(md);
+ ret = media_device_init(md);
+ if (ret < 0)
+ v4l2_device_unregister(v4l2_dev);
return ret;
}
diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c
index 42dff9d020af..1e319eaeb8fe 100644
--- a/drivers/media/platform/vsp1/vsp1_drv.c
+++ b/drivers/media/platform/vsp1/vsp1_drv.c
@@ -142,7 +142,12 @@ static int vsp1_create_entities(struct vsp1_device *vsp1)
strlcpy(mdev->model, "VSP1", sizeof(mdev->model));
snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
dev_name(mdev->dev));
- media_device_init(mdev);
+ ret = media_device_init(mdev);
+ if (ret < 0) {
+ dev_err(vsp1->dev, "media device registration failed (%d)\n",
+ ret);
+ return ret;
+ }
vdev->mdev = mdev;
ret = v4l2_device_register(vsp1->dev, vdev);
diff --git a/drivers/media/platform/xilinx/xilinx-vipp.c b/drivers/media/platform/xilinx/xilinx-vipp.c
index e795a4501e8b..7c5d23010d6f 100644
--- a/drivers/media/platform/xilinx/xilinx-vipp.c
+++ b/drivers/media/platform/xilinx/xilinx-vipp.c
@@ -585,7 +585,12 @@ static int xvip_composite_v4l2_init(struct xvip_composite_device *xdev)
sizeof(xdev->media_dev.model));
xdev->media_dev.hw_revision = 0;
- media_device_init(&xdev->media_dev);
+ ret = media_device_init(&xdev->media_dev);
+ if (ret < 0) {
+ dev_err(xdev->dev, "media device registration failed (%d)\n",
+ ret);
+ return ret;
+ }
xdev->v4l2_dev.mdev = &xdev->media_dev;
ret = v4l2_device_register(xdev->dev, &xdev->v4l2_dev);
diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
index e7aab47ae4f5..2f91bbc633b4 100644
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -217,15 +217,16 @@ static void au0828_usb_disconnect(struct usb_interface *interface)
au0828_usb_release(dev);
}
-static void au0828_media_device_init(struct au0828_dev *dev,
- struct usb_device *udev)
+static int au0828_media_device_init(struct au0828_dev *dev,
+ struct usb_device *udev)
{
#ifdef CONFIG_MEDIA_CONTROLLER
struct media_device *mdev;
+ int ret;
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev)
- return;
+ return -ENOMEM;
mdev->dev = &udev->dev;
@@ -239,10 +240,18 @@ static void au0828_media_device_init(struct au0828_dev *dev,
mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
mdev->driver_version = LINUX_VERSION_CODE;
- media_device_init(mdev);
+ ret = media_device_init(mdev);
+ if (ret) {
+ pr_err(
+ "Couldn't create a media device. Error: %d\n",
+ ret);
+ kfree(mdev);
+ return ret;
+ }
dev->media_dev = mdev;
#endif
+ return 0;
}
@@ -368,7 +377,14 @@ static int au0828_usb_probe(struct usb_interface *interface,
dev->board = au0828_boards[dev->boardnr];
/* Initialize the media controller */
- au0828_media_device_init(dev, usbdev);
+ retval = au0828_media_device_init(dev, usbdev);
+ if (retval) {
+ pr_err("%s() au0828_media_device_init failed\n",
+ __func__);
+ mutex_unlock(&dev->lock);
+ kfree(dev);
+ return retval;
+ }
#ifdef CONFIG_VIDEO_AU0828_V4L2
dev->v4l2_dev.release = au0828_usb_v4l2_release;
diff --git a/drivers/media/usb/cx231xx/cx231xx-cards.c b/drivers/media/usb/cx231xx/cx231xx-cards.c
index 2e997f09a4cd..35692d19b652 100644
--- a/drivers/media/usb/cx231xx/cx231xx-cards.c
+++ b/drivers/media/usb/cx231xx/cx231xx-cards.c
@@ -1206,15 +1206,16 @@ void cx231xx_release_resources(struct cx231xx *dev)
clear_bit(dev->devno, &cx231xx_devused);
}
-static void cx231xx_media_device_init(struct cx231xx *dev,
- struct usb_device *udev)
+static int cx231xx_media_device_init(struct cx231xx *dev,
+ struct usb_device *udev)
{
#ifdef CONFIG_MEDIA_CONTROLLER
struct media_device *mdev;
+ int ret;
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev)
- return;
+ return -ENOMEM;
mdev->dev = dev->dev;
strlcpy(mdev->model, dev->board.name, sizeof(mdev->model));
@@ -1224,10 +1225,18 @@ static void cx231xx_media_device_init(struct cx231xx *dev,
mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
mdev->driver_version = LINUX_VERSION_CODE;
- media_device_init(mdev);
+ ret = media_device_init(mdev);
+ if (ret) {
+ dev_err(dev->dev,
+ "Couldn't create a media device. Error: %d\n",
+ ret);
+ kfree(mdev);
+ return ret;
+ }
dev->media_dev = mdev;
#endif
+ return 0;
}
static int cx231xx_create_media_graph(struct cx231xx *dev)
@@ -1663,7 +1672,11 @@ static int cx231xx_usb_probe(struct usb_interface *interface,
usb_set_intfdata(interface, dev);
/* Initialize the media controller */
- cx231xx_media_device_init(dev, udev);
+ retval = cx231xx_media_device_init(dev, udev);
+ if (retval) {
+ dev_err(d, "cx231xx_media_device_init failed\n");
+ goto err_v4l2;
+ }
/* Create v4l2 device */
#ifdef CONFIG_MEDIA_CONTROLLER
diff --git a/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c b/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c
index a0413dcc3361..9992ac6e63cc 100644
--- a/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c
+++ b/drivers/media/usb/dvb-usb-v2/dvb_usb_core.c
@@ -400,7 +400,7 @@ skip_feed_stop:
return ret;
}
-static void dvb_usbv2_media_device_init(struct dvb_usb_adapter *adap)
+static int dvb_usbv2_media_device_init(struct dvb_usb_adapter *adap)
{
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
struct media_device *mdev;
@@ -410,7 +410,7 @@ static void dvb_usbv2_media_device_init(struct dvb_usb_adapter *adap)
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev)
- return;
+ return -ENOMEM;
mdev->dev = &udev->dev;
strlcpy(mdev->model, d->name, sizeof(mdev->model));
@@ -420,19 +420,28 @@ static void dvb_usbv2_media_device_init(struct dvb_usb_adapter *adap)
mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
mdev->driver_version = LINUX_VERSION_CODE;
- media_device_init(mdev);
+ ret = media_device_init(mdev);
+ if (ret) {
+ dev_err(&d->udev->dev,
+ "Couldn't create a media device. Error: %d\n",
+ ret);
+ kfree(mdev);
+ return ret;
+ }
dvb_register_media_controller(&adap->dvb_adap, mdev);
dev_info(&d->udev->dev, "media controller created\n");
-
#endif
+ return 0;
}
-static void dvb_usbv2_media_device_register(struct dvb_usb_adapter *adap)
+static int dvb_usbv2_media_device_register(struct dvb_usb_adapter *adap)
{
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
- media_device_register(adap->dvb_adap.mdev);
+ return media_device_register(adap->dvb_adap.mdev);
+#else
+ return 0;
#endif
}
@@ -468,7 +477,12 @@ static int dvb_usbv2_adapter_dvb_init(struct dvb_usb_adapter *adap)
adap->dvb_adap.priv = adap;
- dvb_usbv2_media_device_init(adap);
+ ret = dvb_usbv2_media_device_init(adap);
+ if (ret < 0) {
+ dev_dbg(&d->udev->dev, "%s: dvb_usbv2_media_device_init() failed=%d\n",
+ __func__, ret);
+ goto err_dvb_register_mc;
+ }
if (d->props->read_mac_address) {
ret = d->props->read_mac_address(adap,
@@ -519,6 +533,7 @@ err_dvb_dmxdev_init:
dvb_dmx_release(&adap->demux);
err_dvb_dmx_init:
dvb_usbv2_media_device_unregister(adap);
+err_dvb_register_mc:
dvb_unregister_adapter(&adap->dvb_adap);
err_dvb_register_adapter:
adap->dvb_adap.priv = NULL;
@@ -703,9 +718,9 @@ static int dvb_usbv2_adapter_frontend_init(struct dvb_usb_adapter *adap)
if (ret < 0)
goto err_dvb_unregister_frontend;
- dvb_usbv2_media_device_register(&adap->dvb_adap);
+ ret = dvb_usbv2_media_device_register(adap);
- return 0;
+ return ret;
err_dvb_unregister_frontend:
for (i = count_registered - 1; i >= 0; i--)
diff --git a/drivers/media/usb/dvb-usb/dvb-usb-dvb.c b/drivers/media/usb/dvb-usb/dvb-usb-dvb.c
index 4086d9626664..920396f935ab 100644
--- a/drivers/media/usb/dvb-usb/dvb-usb-dvb.c
+++ b/drivers/media/usb/dvb-usb/dvb-usb-dvb.c
@@ -95,7 +95,7 @@ static int dvb_usb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
return dvb_usb_ctrl_feed(dvbdmxfeed, 0);
}
-static void dvb_usb_media_device_init(struct dvb_usb_adapter *adap)
+static int dvb_usb_media_device_init(struct dvb_usb_adapter *adap)
{
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
struct media_device *mdev;
@@ -105,7 +105,7 @@ static void dvb_usb_media_device_init(struct dvb_usb_adapter *adap)
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev)
- return;
+ return -EINVAL;
mdev->dev = &udev->dev;
strlcpy(mdev->model, d->desc->name, sizeof(mdev->model));
@@ -115,18 +115,27 @@ static void dvb_usb_media_device_init(struct dvb_usb_adapter *adap)
mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
mdev->driver_version = LINUX_VERSION_CODE;
- media_device_init(mdev);
-
+ ret = media_device_init(mdev);
+ if (ret) {
+ dev_err(&d->udev->dev,
+ "Couldn't create a media device. Error: %d\n",
+ ret);
+ kfree(mdev);
+ return ret;
+ }
dvb_register_media_controller(&adap->dvb_adap, mdev);
dev_info(&d->udev->dev, "media controller created\n");
#endif
+ return 0;
}
-static void dvb_usb_media_device_register(struct dvb_usb_adapter *adap)
+static int dvb_usb_media_device_register(struct dvb_usb_adapter *adap)
{
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
- media_device_register(adap->dvb_adap.mdev);
+ return media_device_register(adap->dvb_adap.mdev);
+#else
+ return 0;
#endif
}
@@ -156,7 +165,11 @@ int dvb_usb_adapter_dvb_init(struct dvb_usb_adapter *adap, short *adapter_nums)
}
adap->dvb_adap.priv = adap;
- dvb_usb_media_device_init(adap);
+ ret = dvb_usb_media_device_init(adap);
+ if (ret < 0) {
+ deb_info("dvb_usb_media_device_init failed: error %d", ret);
+ goto err_mc;
+ }
if (adap->dev->props.read_mac_address) {
if (adap->dev->props.read_mac_address(adap->dev, adap->dvb_adap.proposed_mac) == 0)
@@ -206,6 +219,7 @@ err_dmx_dev:
dvb_dmx_release(&adap->demux);
err_dmx:
dvb_usb_media_device_unregister(adap);
+err_mc:
dvb_unregister_adapter(&adap->dvb_adap);
err:
return ret;
@@ -324,8 +338,10 @@ int dvb_usb_adapter_frontend_init(struct dvb_usb_adapter *adap)
return ret;
ret = dvb_create_media_graph(&adap->dvb_adap);
+ if (ret)
+ return ret;
- dvb_usb_media_device_register(adap);
+ ret = dvb_usb_media_device_register(adap);
return ret;
}
diff --git a/drivers/media/usb/siano/smsusb.c b/drivers/media/usb/siano/smsusb.c
index 8abbd3cc8eba..327180efa264 100644
--- a/drivers/media/usb/siano/smsusb.c
+++ b/drivers/media/usb/siano/smsusb.c
@@ -361,7 +361,11 @@ static void *siano_media_device_register(struct smsusb_device_t *dev,
mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
mdev->driver_version = LINUX_VERSION_CODE;
- media_device_init(mdev);
+ ret = media_device_init(mdev);
+ if (ret) {
+ kfree(mdev);
+ return NULL;
+ }
ret = media_device_register(mdev);
if (ret) {
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 96fc2c2efa7b..4dfd3eb814e7 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1917,7 +1917,8 @@ static int uvc_probe(struct usb_interface *intf,
strcpy(dev->mdev.bus_info, udev->devpath);
dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
dev->mdev.driver_version = LINUX_VERSION_CODE;
- media_device_init(&dev->mdev);
+ if (media_device_init(&dev->mdev) < 0)
+ goto error;
dev->vdev.mdev = &dev->mdev;
#endif
diff --git a/include/media/media-device.h b/include/media/media-device.h
index 572190860cbb..f09be5d47a7d 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -351,7 +351,7 @@ struct media_device {
* within the media device, create pad to pad links and then finally register
* the media device by calling media_device_register() as a final step.
*/
-void media_device_init(struct media_device *mdev);
+int __must_check media_device_init(struct media_device *mdev);
/**
* media_device_cleanup() - Cleanups a media device element
--
2.5.0
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