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Subject[PATCH 13/18] V4L/DVB (4742): Drivers/media/video: handle sysfs errors
Date

From: Jeff Garzik <jeff@garzik.org>

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
---
drivers/media/video/et61x251/et61x251_core.c | 37 +++++++++++---
drivers/media/video/pwc/pwc-if.c | 41 ++++++++++++---
drivers/media/video/sn9c102/sn9c102_core.c | 71 ++++++++++++++++++++------
3 files changed, 117 insertions(+), 32 deletions(-)
diff --git a/drivers/media/video/et61x251/et61x251_core.c b/drivers/media/video/et61x251/et61x251_core.c
index bc544cc..f786ab1 100644
--- a/drivers/media/video/et61x251/et61x251_core.c
+++ b/drivers/media/video/et61x251/et61x251_core.c
@@ -973,16 +973,32 @@ static CLASS_DEVICE_ATTR(i2c_val, S_IRUG
et61x251_show_i2c_val, et61x251_store_i2c_val);


-static void et61x251_create_sysfs(struct et61x251_device* cam)
+static int et61x251_create_sysfs(struct et61x251_device* cam)
{
struct video_device *v4ldev = cam->v4ldev;
+ int rc;

- video_device_create_file(v4ldev, &class_device_attr_reg);
- video_device_create_file(v4ldev, &class_device_attr_val);
+ rc = video_device_create_file(v4ldev, &class_device_attr_reg);
+ if (rc) goto err;
+ rc = video_device_create_file(v4ldev, &class_device_attr_val);
+ if (rc) goto err_reg;
if (cam->sensor.sysfs_ops) {
- video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
- video_device_create_file(v4ldev, &class_device_attr_i2c_val);
+ rc = video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
+ if (rc) goto err_val;
+ rc = video_device_create_file(v4ldev, &class_device_attr_i2c_val);
+ if (rc) goto err_i2c_reg;
}
+
+ return 0;
+
+err_i2c_reg:
+ video_device_remove_file(v4ldev, &class_device_attr_i2c_reg);
+err_val:
+ video_device_remove_file(v4ldev, &class_device_attr_val);
+err_reg:
+ video_device_remove_file(v4ldev, &class_device_attr_reg);
+err:
+ return rc;
}
#endif /* CONFIG_VIDEO_ADV_DEBUG */

@@ -2534,7 +2550,9 @@ et61x251_usb_probe(struct usb_interface*
dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;

#ifdef CONFIG_VIDEO_ADV_DEBUG
- et61x251_create_sysfs(cam);
+ err = et61x251_create_sysfs(cam);
+ if (err)
+ goto fail2;
DBG(2, "Optional device control through 'sysfs' interface ready");
#endif

@@ -2544,6 +2562,13 @@ #endif

return 0;

+#ifdef CONFIG_VIDEO_ADV_DEBUG
+fail2:
+ video_nr[dev_nr] = -1;
+ dev_nr = (dev_nr < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
+ mutex_unlock(&cam->dev_mutex);
+ video_unregister_device(cam->v4ldev);
+#endif
fail:
if (cam) {
kfree(cam->control_buffer);
diff --git a/drivers/media/video/pwc/pwc-if.c b/drivers/media/video/pwc/pwc-if.c
index c77b85c..46c1148 100644
--- a/drivers/media/video/pwc/pwc-if.c
+++ b/drivers/media/video/pwc/pwc-if.c
@@ -1024,12 +1024,25 @@ static ssize_t show_snapshot_button_stat
static CLASS_DEVICE_ATTR(button, S_IRUGO | S_IWUSR, show_snapshot_button_status,
NULL);

-static void pwc_create_sysfs_files(struct video_device *vdev)
+static int pwc_create_sysfs_files(struct video_device *vdev)
{
struct pwc_device *pdev = video_get_drvdata(vdev);
- if (pdev->features & FEATURE_MOTOR_PANTILT)
- video_device_create_file(vdev, &class_device_attr_pan_tilt);
- video_device_create_file(vdev, &class_device_attr_button);
+ int rc;
+
+ rc = video_device_create_file(vdev, &class_device_attr_button);
+ if (rc)
+ goto err;
+ if (pdev->features & FEATURE_MOTOR_PANTILT) {
+ rc = video_device_create_file(vdev,&class_device_attr_pan_tilt);
+ if (rc) goto err_button;
+ }
+
+ return 0;
+
+err_button:
+ video_device_remove_file(vdev, &class_device_attr_button);
+err:
+ return rc;
}

static void pwc_remove_sysfs_files(struct video_device *vdev)
@@ -1408,7 +1421,7 @@ static int usb_pwc_probe(struct usb_inte
struct usb_device *udev = interface_to_usbdev(intf);
struct pwc_device *pdev = NULL;
int vendor_id, product_id, type_id;
- int i, hint;
+ int i, hint, rc;
int features = 0;
int video_nr = -1; /* default: use next available device */
char serial_number[30], *name;
@@ -1709,9 +1722,8 @@ static int usb_pwc_probe(struct usb_inte
i = video_register_device(pdev->vdev, VFL_TYPE_GRABBER, video_nr);
if (i < 0) {
PWC_ERROR("Failed to register as video device (%d).\n", i);
- video_device_release(pdev->vdev); /* Drip... drip... drip... */
- kfree(pdev); /* Oops, no memory leaks please */
- return -EIO;
+ rc = i;
+ goto err;
}
else {
PWC_INFO("Registered as /dev/video%d.\n", pdev->vdev->minor & 0x3F);
@@ -1723,13 +1735,24 @@ static int usb_pwc_probe(struct usb_inte

PWC_DEBUG_PROBE("probe() function returning struct at 0x%p.\n", pdev);
usb_set_intfdata (intf, pdev);
- pwc_create_sysfs_files(pdev->vdev);
+ rc = pwc_create_sysfs_files(pdev->vdev);
+ if (rc)
+ goto err_unreg;

/* Set the leds off */
pwc_set_leds(pdev, 0, 0);
pwc_camera_power(pdev, 0);

return 0;
+
+err_unreg:
+ if (hint < MAX_DEV_HINTS)
+ device_hint[hint].pdev = NULL;
+ video_unregister_device(pdev->vdev);
+err:
+ video_device_release(pdev->vdev); /* Drip... drip... drip... */
+ kfree(pdev); /* Oops, no memory leaks please */
+ return rc;
}

/* The user janked out the cable... */
diff --git a/drivers/media/video/sn9c102/sn9c102_core.c b/drivers/media/video/sn9c102/sn9c102_core.c
index 3e0ff8a..a4702d3 100644
--- a/drivers/media/video/sn9c102/sn9c102_core.c
+++ b/drivers/media/video/sn9c102/sn9c102_core.c
@@ -1240,23 +1240,53 @@ static CLASS_DEVICE_ATTR(frame_header, S
sn9c102_show_frame_header, NULL);


-static void sn9c102_create_sysfs(struct sn9c102_device* cam)
+static int sn9c102_create_sysfs(struct sn9c102_device* cam)
{
struct video_device *v4ldev = cam->v4ldev;
+ int rc;
+
+ rc = video_device_create_file(v4ldev, &class_device_attr_reg);
+ if (rc) goto err;
+ rc = video_device_create_file(v4ldev, &class_device_attr_val);
+ if (rc) goto err_reg;
+ rc = video_device_create_file(v4ldev, &class_device_attr_frame_header);
+ if (rc) goto err_val;

- video_device_create_file(v4ldev, &class_device_attr_reg);
- video_device_create_file(v4ldev, &class_device_attr_val);
- video_device_create_file(v4ldev, &class_device_attr_frame_header);
- if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102)
- video_device_create_file(v4ldev, &class_device_attr_green);
- else if (cam->bridge == BRIDGE_SN9C103) {
- video_device_create_file(v4ldev, &class_device_attr_blue);
- video_device_create_file(v4ldev, &class_device_attr_red);
- }
if (cam->sensor.sysfs_ops) {
- video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
- video_device_create_file(v4ldev, &class_device_attr_i2c_val);
+ rc = video_device_create_file(v4ldev, &class_device_attr_i2c_reg);
+ if (rc) goto err_frhead;
+ rc = video_device_create_file(v4ldev, &class_device_attr_i2c_val);
+ if (rc) goto err_i2c_reg;
+ }
+
+ if (cam->bridge == BRIDGE_SN9C101 || cam->bridge == BRIDGE_SN9C102) {
+ rc = video_device_create_file(v4ldev, &class_device_attr_green);
+ if (rc) goto err_i2c_val;
+ } else if (cam->bridge == BRIDGE_SN9C103) {
+ rc = video_device_create_file(v4ldev, &class_device_attr_blue);
+ if (rc) goto err_i2c_val;
+ rc = video_device_create_file(v4ldev, &class_device_attr_red);
+ if (rc) goto err_blue;
}
+
+ return 0;
+
+err_blue:
+ video_device_remove_file(v4ldev, &class_device_attr_blue);
+err_i2c_val:
+ if (cam->sensor.sysfs_ops)
+ video_device_remove_file(v4ldev, &class_device_attr_i2c_val);
+err_i2c_reg:
+ if (cam->sensor.sysfs_ops)
+ video_device_remove_file(v4ldev, &class_device_attr_i2c_reg);
+err_frhead:
+ video_device_remove_file(v4ldev, &class_device_attr_frame_header);
+err_val:
+ video_device_remove_file(v4ldev, &class_device_attr_val);
+err_reg:
+ video_device_remove_file(v4ldev, &class_device_attr_reg);
+err:
+ return rc;
}
#endif /* CONFIG_VIDEO_ADV_DEBUG */

@@ -2809,10 +2839,7 @@ sn9c102_usb_probe(struct usb_interface*
DBG(1, "V4L2 device registration failed");
if (err == -ENFILE && video_nr[dev_nr] == -1)
DBG(1, "Free /dev/videoX node not found");
- video_nr[dev_nr] = -1;
- dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
- mutex_unlock(&cam->dev_mutex);
- goto fail;
+ goto fail2;
}

DBG(2, "V4L2 device registered as /dev/video%d", cam->v4ldev->minor);
@@ -2823,7 +2850,9 @@ sn9c102_usb_probe(struct usb_interface*
dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;

#ifdef CONFIG_VIDEO_ADV_DEBUG
- sn9c102_create_sysfs(cam);
+ err = sn9c102_create_sysfs(cam);
+ if (err)
+ goto fail3;
DBG(2, "Optional device control through 'sysfs' interface ready");
#endif

@@ -2833,6 +2862,14 @@ #endif

return 0;

+#ifdef CONFIG_VIDEO_ADV_DEBUG
+fail3:
+ video_unregister_device(cam->v4ldev);
+#endif
+fail2:
+ video_nr[dev_nr] = -1;
+ dev_nr = (dev_nr < SN9C102_MAX_DEVICES-1) ? dev_nr+1 : 0;
+ mutex_unlock(&cam->dev_mutex);
fail:
if (cam) {
kfree(cam->control_buffer);
-
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