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V4L/DVB (10620): gspca - main: More checks of the device disconnection.
- 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
Mauro Carvalho Chehab
parent
10711d07c1
commit
090264e508
@ -132,11 +132,13 @@ static void fill_frame(struct gspca_dev *gspca_dev,
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cam_pkt_op pkt_scan;
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if (urb->status != 0) {
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if (urb->status == -ESHUTDOWN)
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return; /* disconnection */
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#ifdef CONFIG_PM
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if (!gspca_dev->frozen)
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#endif
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PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
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return; /* disconnection ? */
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return;
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}
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pkt_scan = gspca_dev->sd_desc->pkt_scan;
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for (i = 0; i < urb->number_of_packets; i++) {
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@ -208,6 +210,8 @@ static void bulk_irq(struct urb *urb)
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switch (urb->status) {
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case 0:
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break;
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case -ESHUTDOWN:
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return; /* disconnection */
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case -ECONNRESET:
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urb->status = 0;
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break;
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@ -216,7 +220,7 @@ static void bulk_irq(struct urb *urb)
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if (!gspca_dev->frozen)
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#endif
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PDEBUG(D_ERR|D_PACK, "urb status: %d", urb->status);
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return; /* disconnection ? */
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return;
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}
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/* check the availability of the frame buffer */
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@ -422,10 +426,8 @@ static void destroy_urbs(struct gspca_dev *gspca_dev)
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if (urb == NULL)
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break;
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BUG_ON(!gspca_dev->dev);
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gspca_dev->urb[i] = NULL;
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if (!gspca_dev->present)
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usb_kill_urb(urb);
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usb_kill_urb(urb);
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if (urb->transfer_buffer != NULL)
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usb_buffer_free(gspca_dev->dev,
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urb->transfer_buffer_length,
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@ -593,6 +595,11 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
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if (mutex_lock_interruptible(&gspca_dev->usb_lock))
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return -ERESTARTSYS;
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if (!gspca_dev->present) {
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ret = -ENODEV;
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goto out;
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}
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/* set the higher alternate setting and
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* loop until urb submit succeeds */
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gspca_dev->alt = gspca_dev->nbalt;
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@ -662,12 +669,14 @@ static int gspca_set_alt0(struct gspca_dev *gspca_dev)
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static void gspca_stream_off(struct gspca_dev *gspca_dev)
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{
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gspca_dev->streaming = 0;
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if (gspca_dev->present
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&& gspca_dev->sd_desc->stopN)
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gspca_dev->sd_desc->stopN(gspca_dev);
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destroy_urbs(gspca_dev);
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if (gspca_dev->present)
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if (gspca_dev->present) {
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if (gspca_dev->sd_desc->stopN)
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gspca_dev->sd_desc->stopN(gspca_dev);
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destroy_urbs(gspca_dev);
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gspca_set_alt0(gspca_dev);
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}
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/* always call stop0 to free the subdriver's resources */
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if (gspca_dev->sd_desc->stop0)
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gspca_dev->sd_desc->stop0(gspca_dev);
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PDEBUG(D_STREAM, "stream off OK");
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@ -949,8 +958,17 @@ static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *cap)
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{
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struct gspca_dev *gspca_dev = priv;
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int ret;
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memset(cap, 0, sizeof *cap);
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/* protect the access to the usb device */
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if (mutex_lock_interruptible(&gspca_dev->usb_lock))
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return -ERESTARTSYS;
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if (!gspca_dev->present) {
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ret = -ENODEV;
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goto out;
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}
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strncpy(cap->driver, gspca_dev->sd_desc->name, sizeof cap->driver);
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if (gspca_dev->dev->product != NULL) {
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strncpy(cap->card, gspca_dev->dev->product,
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@ -966,7 +984,10 @@ static int vidioc_querycap(struct file *file, void *priv,
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cap->capabilities = V4L2_CAP_VIDEO_CAPTURE
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| V4L2_CAP_STREAMING
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| V4L2_CAP_READWRITE;
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return 0;
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ret = 0;
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out:
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mutex_unlock(&gspca_dev->usb_lock);
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return ret;
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}
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static int vidioc_queryctrl(struct file *file, void *priv,
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@ -1029,7 +1050,10 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
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PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
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if (mutex_lock_interruptible(&gspca_dev->usb_lock))
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return -ERESTARTSYS;
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ret = ctrls->set(gspca_dev, ctrl->value);
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if (gspca_dev->present)
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ret = ctrls->set(gspca_dev, ctrl->value);
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else
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ret = -ENODEV;
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mutex_unlock(&gspca_dev->usb_lock);
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return ret;
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}
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@ -1053,7 +1077,10 @@ static int vidioc_g_ctrl(struct file *file, void *priv,
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return -EINVAL;
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if (mutex_lock_interruptible(&gspca_dev->usb_lock))
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return -ERESTARTSYS;
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ret = ctrls->get(gspca_dev, &ctrl->value);
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if (gspca_dev->present)
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ret = ctrls->get(gspca_dev, &ctrl->value);
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else
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ret = -ENODEV;
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mutex_unlock(&gspca_dev->usb_lock);
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return ret;
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}
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@ -1215,10 +1242,7 @@ static int vidioc_streamon(struct file *file, void *priv,
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return -EINVAL;
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if (mutex_lock_interruptible(&gspca_dev->queue_lock))
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return -ERESTARTSYS;
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if (!gspca_dev->present) {
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ret = -ENODEV;
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goto out;
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}
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if (gspca_dev->nframes == 0
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|| !(gspca_dev->frame[0].v4l2_buf.flags & V4L2_BUF_FLAG_QUEUED)) {
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ret = -EINVAL;
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@ -1286,7 +1310,10 @@ static int vidioc_g_jpegcomp(struct file *file, void *priv,
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return -EINVAL;
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if (mutex_lock_interruptible(&gspca_dev->usb_lock))
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return -ERESTARTSYS;
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ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
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if (gspca_dev->present)
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ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
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else
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ret = -ENODEV;
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mutex_unlock(&gspca_dev->usb_lock);
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return ret;
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}
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@ -1301,7 +1328,10 @@ static int vidioc_s_jpegcomp(struct file *file, void *priv,
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return -EINVAL;
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if (mutex_lock_interruptible(&gspca_dev->usb_lock))
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return -ERESTARTSYS;
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ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
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if (gspca_dev->present)
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ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
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else
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ret = -ENODEV;
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mutex_unlock(&gspca_dev->usb_lock);
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return ret;
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}
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@ -1320,7 +1350,11 @@ static int vidioc_g_parm(struct file *filp, void *priv,
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if (mutex_lock_interruptible(&gspca_dev->usb_lock))
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return -ERESTARTSYS;
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ret = gspca_dev->sd_desc->get_streamparm(gspca_dev, parm);
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if (gspca_dev->present)
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ret = gspca_dev->sd_desc->get_streamparm(gspca_dev,
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parm);
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else
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ret = -ENODEV;
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mutex_unlock(&gspca_dev->usb_lock);
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return ret;
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}
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@ -1345,7 +1379,11 @@ static int vidioc_s_parm(struct file *filp, void *priv,
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if (mutex_lock_interruptible(&gspca_dev->usb_lock))
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return -ERESTARTSYS;
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ret = gspca_dev->sd_desc->set_streamparm(gspca_dev, parm);
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if (gspca_dev->present)
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ret = gspca_dev->sd_desc->set_streamparm(gspca_dev,
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parm);
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else
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ret = -ENODEV;
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mutex_unlock(&gspca_dev->usb_lock);
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return ret;
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}
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@ -1519,7 +1557,8 @@ static int frame_wait(struct gspca_dev *gspca_dev,
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if (gspca_dev->sd_desc->dq_callback) {
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mutex_lock(&gspca_dev->usb_lock);
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gspca_dev->sd_desc->dq_callback(gspca_dev);
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if (gspca_dev->present)
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gspca_dev->sd_desc->dq_callback(gspca_dev);
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mutex_unlock(&gspca_dev->usb_lock);
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}
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return j;
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@ -1541,6 +1580,9 @@ static int vidioc_dqbuf(struct file *file, void *priv,
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if (v4l2_buf->memory != gspca_dev->memory)
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return -EINVAL;
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if (!gspca_dev->present)
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return -ENODEV;
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/* if not streaming, be sure the application will not loop forever */
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if (!(file->f_flags & O_NONBLOCK)
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&& !gspca_dev->streaming && gspca_dev->users == 1)
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@ -1691,8 +1733,6 @@ static unsigned int dev_poll(struct file *file, poll_table *wait)
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PDEBUG(D_FRAM, "poll");
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poll_wait(file, &gspca_dev->wq, wait);
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if (!gspca_dev->present)
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return POLLERR;
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/* if reqbufs is not done, the user would use read() */
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if (gspca_dev->nframes == 0) {
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@ -1705,10 +1745,6 @@ static unsigned int dev_poll(struct file *file, poll_table *wait)
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if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)
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return POLLERR;
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if (!gspca_dev->present) {
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ret = POLLERR;
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goto out;
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}
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/* check the next incoming buffer */
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i = gspca_dev->fr_o;
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@ -1717,8 +1753,9 @@ static unsigned int dev_poll(struct file *file, poll_table *wait)
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ret = POLLIN | POLLRDNORM; /* something to read */
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else
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ret = 0;
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out:
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mutex_unlock(&gspca_dev->queue_lock);
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if (!gspca_dev->present)
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return POLLHUP;
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return ret;
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}
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@ -1944,10 +1981,16 @@ void gspca_disconnect(struct usb_interface *intf)
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mutex_lock(&gspca_dev->usb_lock);
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gspca_dev->present = 0;
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if (gspca_dev->streaming) {
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destroy_urbs(gspca_dev);
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wake_up_interruptible(&gspca_dev->wq);
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}
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/* the device is freed at exit of this function */
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gspca_dev->dev = NULL;
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mutex_unlock(&gspca_dev->usb_lock);
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destroy_urbs(gspca_dev);
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gspca_dev->dev = NULL;
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usb_set_intfdata(intf, NULL);
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/* release the device */
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