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V4L/DVB (10620): gspca - main: More checks of the device disconnection.

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- prevent application oops when the device is disconnected
- wake up the application at disconnection time
- check the disconnection in ioctl dqbuf and poll

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jean-Francois Moine 2009-02-12 08:05:45 -03:00 committed by Mauro Carvalho Chehab
parent 10711d07c1
commit 090264e508
1 changed files with 74 additions and 31 deletions
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105
drivers/media/video/gspca/gspca.c
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@ -132,11 +132,13 @@ static void fill_frame(struct gspca_dev *gspca_dev,
cam_pkt_op pkt_scan;
if (urb->status != 0) {
if (urb->status == -ESHUTDOWN)
return; /* disconnection */
#ifdef CONFIG_PM
if (!gspca_dev->frozen)
#endif
PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
return; /* disconnection ? */
return;
}
pkt_scan = gspca_dev->sd_desc->pkt_scan;
for (i = 0; i < urb->number_of_packets; i++) {
@ -208,6 +210,8 @@ static void bulk_irq(struct urb *urb)
switch (urb->status) {
case 0:
break;
case -ESHUTDOWN:
return; /* disconnection */
case -ECONNRESET:
urb->status = 0;
break;
@ -216,7 +220,7 @@ static void bulk_irq(struct urb *urb)
if (!gspca_dev->frozen)
#endif
PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
return; /* disconnection ? */
return;
}
/* check the availability of the frame buffer */
@ -422,10 +426,8 @@ static void destroy_urbs(struct gspca_dev *gspca_dev)
if (urb == NULL)
break;
BUG_ON(!gspca_dev->dev);
gspca_dev->urb[i] = NULL;
if (!gspca_dev->present)
usb_kill_urb(urb);
usb_kill_urb(urb);
if (urb->transfer_buffer != NULL)
usb_buffer_free(gspca_dev->dev,
urb->transfer_buffer_length,
@ -593,6 +595,11 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
/* set the higher alternate setting and
* loop until urb submit succeeds */
gspca_dev->alt = gspca_dev->nbalt;
@ -662,12 +669,14 @@ static int gspca_set_alt0(struct gspca_dev *gspca_dev)
static void gspca_stream_off(struct gspca_dev *gspca_dev)
{
gspca_dev->streaming = 0;
if (gspca_dev->present
&& gspca_dev->sd_desc->stopN)
gspca_dev->sd_desc->stopN(gspca_dev);
destroy_urbs(gspca_dev);
if (gspca_dev->present)
if (gspca_dev->present) {
if (gspca_dev->sd_desc->stopN)
gspca_dev->sd_desc->stopN(gspca_dev);
destroy_urbs(gspca_dev);
gspca_set_alt0(gspca_dev);
}
/* always call stop0 to free the subdriver's resources */
if (gspca_dev->sd_desc->stop0)
gspca_dev->sd_desc->stop0(gspca_dev);
PDEBUG(D_STREAM, "stream off OK");
@ -949,8 +958,17 @@ static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct gspca_dev *gspca_dev = priv;
int ret;
memset(cap, 0, sizeof *cap);
/* protect the access to the usb device */
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
if (gspca_dev->dev->product != NULL) {
strncpy(cap->card, gspca_dev->dev->product,
@ -966,7 +984,10 @@ static int vidioc_querycap(struct file *file, void *priv,
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
| V4L2_CAP_STREAMING
| V4L2_CAP_READWRITE;
return 0;
ret = 0;
out:
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
static int vidioc_queryctrl(struct file *file, void *priv,
@ -1029,7 +1050,10 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = ctrls->set(gspca_dev, ctrl->value);
if (gspca_dev->present)
ret = ctrls->set(gspca_dev, ctrl->value);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
@ -1053,7 +1077,10 @@ static int vidioc_g_ctrl(struct file *file, void *priv,
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = ctrls->get(gspca_dev, &ctrl->value);
if (gspca_dev->present)
ret = ctrls->get(gspca_dev, &ctrl->value);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
@ -1215,10 +1242,7 @@ static int vidioc_streamon(struct file *file, void *priv,
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->queue_lock))
return -ERESTARTSYS;
if (!gspca_dev->present) {
ret = -ENODEV;
goto out;
}
if (gspca_dev->nframes == 0
|| !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
ret = -EINVAL;
@ -1286,7 +1310,10 @@ static int vidioc_g_jpegcomp(struct file *file, void *priv,
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
if (gspca_dev->present)
ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
@ -1301,7 +1328,10 @@ static int vidioc_s_jpegcomp(struct file *file, void *priv,
return -EINVAL;
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
if (gspca_dev->present)
ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
@ -1320,7 +1350,11 @@ static int vidioc_g_parm(struct file *filp, void *priv,
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
if (gspca_dev->present)
ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
parm);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
@ -1345,7 +1379,11 @@ static int vidioc_s_parm(struct file *filp, void *priv,
if (mutex_lock_interruptible(&gspca_dev->usb_lock))
return -ERESTARTSYS;
ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
if (gspca_dev->present)
ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
parm);
else
ret = -ENODEV;
mutex_unlock(&gspca_dev->usb_lock);
return ret;
}
@ -1519,7 +1557,8 @@ static int frame_wait(struct gspca_dev *gspca_dev,
if (gspca_dev->sd_desc->dq_callback) {
mutex_lock(&gspca_dev->usb_lock);
gspca_dev->sd_desc->dq_callback(gspca_dev);
if (gspca_dev->present)
gspca_dev->sd_desc->dq_callback(gspca_dev);
mutex_unlock(&gspca_dev->usb_lock);
}
return j;
@ -1541,6 +1580,9 @@ static int vidioc_dqbuf(struct file *file, void *priv,
if (v4l2_buf->memory != gspca_dev->memory)
return -EINVAL;
if (!gspca_dev->present)
return -ENODEV;
/* if not streaming, be sure the application will not loop forever */
if (!(file->f_flags & O_NONBLOCK)
&& !gspca_dev->streaming && gspca_dev->users == 1)
@ -1691,8 +1733,6 @@ static unsigned int dev_poll(struct file *file, poll_table *wait)
PDEBUG(D_FRAM, "poll");
poll_wait(file, &gspca_dev->wq, wait);
if (!gspca_dev->present)
return POLLERR;
/* if reqbufs is not done, the user would use read() */
if (gspca_dev->nframes == 0) {
@ -1705,10 +1745,6 @@ static unsigned int dev_poll(struct file *file, poll_table *wait)
if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
return POLLERR;
if (!gspca_dev->present) {
ret = POLLERR;
goto out;
}
/* check the next incoming buffer */
i = gspca_dev->fr_o;
@ -1717,8 +1753,9 @@ static unsigned int dev_poll(struct file *file, poll_table *wait)
ret = POLLIN | POLLRDNORM; /* something to read */
else
ret = 0;
out:
mutex_unlock(&gspca_dev->queue_lock);
if (!gspca_dev->present)
return POLLHUP;
return ret;
}
@ -1944,10 +1981,16 @@ void gspca_disconnect(struct usb_interface *intf)
mutex_lock(&gspca_dev->usb_lock);
gspca_dev->present = 0;
if (gspca_dev->streaming) {
destroy_urbs(gspca_dev);
wake_up_interruptible(&gspca_dev->wq);
}
/* the device is freed at exit of this function */
gspca_dev->dev = NULL;
mutex_unlock(&gspca_dev->usb_lock);
destroy_urbs(gspca_dev);
gspca_dev->dev = NULL;
usb_set_intfdata(intf, NULL);
/* release the device */