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-rw-r--r--drivers/media/video/em28xx/em28xx-video.c182
-rw-r--r--drivers/media/video/em28xx/em28xx.h10
2 files changed, 102 insertions, 90 deletions
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 55bc8ea5609..dda4a76dcab 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -833,34 +833,63 @@ static void video_mux(struct em28xx *dev, int index)
}
/* Usage lock check functions */
-static int res_get(struct em28xx_fh *fh)
+static int res_get(struct em28xx_fh *fh, unsigned int bit)
{
struct em28xx *dev = fh->dev;
- int rc = 0;
- /* This instance already has stream_on */
- if (fh->stream_on)
- return rc;
+ if (fh->resources & bit)
+ /* have it already allocated */
+ return 1;
- if (dev->stream_on)
- return -EBUSY;
+ /* is it free? */
+ mutex_lock(&dev->lock);
+ if (dev->resources & bit) {
+ /* no, someone else uses it */
+ mutex_unlock(&dev->lock);
+ return 0;
+ }
+ /* it's free, grab it */
+ fh->resources |= bit;
+ dev->resources |= bit;
+ em28xx_videodbg("res: get %d\n", bit);
+ mutex_unlock(&dev->lock);
+ return 1;
+}
- dev->stream_on = 1;
- fh->stream_on = 1;
- return rc;
+static int res_check(struct em28xx_fh *fh, unsigned int bit)
+{
+ return (fh->resources & bit);
}
-static int res_check(struct em28xx_fh *fh)
+static int res_locked(struct em28xx *dev, unsigned int bit)
{
- return fh->stream_on;
+ return (dev->resources & bit);
}
-static void res_free(struct em28xx_fh *fh)
+static void res_free(struct em28xx_fh *fh, unsigned int bits)
{
struct em28xx *dev = fh->dev;
- fh->stream_on = 0;
- dev->stream_on = 0;
+ BUG_ON((fh->resources & bits) != bits);
+
+ mutex_lock(&dev->lock);
+ fh->resources &= ~bits;
+ dev->resources &= ~bits;
+ em28xx_videodbg("res: put %d\n", bits);
+ mutex_unlock(&dev->lock);
+}
+
+static int get_ressource(struct em28xx_fh *fh)
+{
+ switch (fh->type) {
+ case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+ return EM28XX_RESOURCE_VIDEO;
+ case V4L2_BUF_TYPE_VBI_CAPTURE:
+ return EM28XX_RESOURCE_VBI;
+ default:
+ BUG();
+ return 0;
+ }
}
/*
@@ -1103,12 +1132,6 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
goto out;
}
- if (dev->stream_on && !fh->stream_on) {
- em28xx_errdev("%s device in use by another fh\n", __func__);
- rc = -EBUSY;
- goto out;
- }
-
rc = em28xx_set_video_format(dev, f->fmt.pix.pixelformat,
f->fmt.pix.width, f->fmt.pix.height);
@@ -1668,24 +1691,25 @@ static int vidioc_streamon(struct file *file, void *priv,
{
struct em28xx_fh *fh = priv;
struct em28xx *dev = fh->dev;
- int rc;
+ int rc = -EINVAL;
rc = check_dev(dev);
if (rc < 0)
return rc;
+ if (unlikely(type != fh->type))
+ return -EINVAL;
- mutex_lock(&dev->lock);
- rc = res_get(fh);
+ em28xx_videodbg("vidioc_streamon fh=%p t=%d fh->res=%d dev->res=%d\n",
+ fh, type, fh->resources, dev->resources);
- if (likely(rc >= 0)) {
- if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
- rc = videobuf_streamon(&fh->vb_vidq);
- else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
- rc = videobuf_streamon(&fh->vb_vbiq);
- }
+ if (unlikely(!res_get(fh,get_ressource(fh))))
+ return -EBUSY;
- mutex_unlock(&dev->lock);
+ if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ rc = videobuf_streamon(&fh->vb_vidq);
+ else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+ rc = videobuf_streamon(&fh->vb_vbiq);
return rc;
}
@@ -1707,16 +1731,16 @@ static int vidioc_streamoff(struct file *file, void *priv,
if (type != fh->type)
return -EINVAL;
- mutex_lock(&dev->lock);
+ em28xx_videodbg("vidioc_streamoff fh=%p t=%d fh->res=%d dev->res=%d\n",
+ fh, type, fh->resources, dev->resources);
- if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
videobuf_streamoff(&fh->vb_vidq);
- else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+ res_free(fh, EM28XX_RESOURCE_VIDEO);
+ } else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
videobuf_streamoff(&fh->vb_vbiq);
-
- res_free(fh);
-
- mutex_unlock(&dev->lock);
+ res_free(fh, EM28XX_RESOURCE_VBI);
+ }
return 0;
}
@@ -2095,17 +2119,16 @@ static int em28xx_v4l2_open(struct file *filp)
else
field = V4L2_FIELD_INTERLACED;
- if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
- videobuf_queue_vmalloc_init(&fh->vb_vidq, &em28xx_video_qops,
- NULL, &dev->slock, fh->type, field,
- sizeof(struct em28xx_buffer), fh);
+ videobuf_queue_vmalloc_init(&fh->vb_vidq, &em28xx_video_qops,
+ NULL, &dev->slock,
+ V4L2_BUF_TYPE_VIDEO_CAPTURE, field,
+ sizeof(struct em28xx_buffer), fh);
- if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
- videobuf_queue_vmalloc_init(&fh->vb_vbiq, &em28xx_vbi_qops,
- NULL, &dev->slock,
- V4L2_BUF_TYPE_VBI_CAPTURE,
- V4L2_FIELD_SEQ_TB,
- sizeof(struct em28xx_buffer), fh);
+ videobuf_queue_vmalloc_init(&fh->vb_vbiq, &em28xx_vbi_qops,
+ NULL, &dev->slock,
+ V4L2_BUF_TYPE_VBI_CAPTURE,
+ V4L2_FIELD_SEQ_TB,
+ sizeof(struct em28xx_buffer), fh);
mutex_unlock(&dev->lock);
@@ -2162,20 +2185,21 @@ static int em28xx_v4l2_close(struct file *filp)
em28xx_videodbg("users=%d\n", dev->users);
-
- mutex_lock(&dev->lock);
- if (res_check(fh))
- res_free(fh);
-
- if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 1) {
+ if (res_check(fh, EM28XX_RESOURCE_VIDEO)) {
videobuf_stop(&fh->vb_vidq);
- videobuf_mmap_free(&fh->vb_vidq);
+ res_free(fh, EM28XX_RESOURCE_VIDEO);
+ }
+ if (res_check(fh, EM28XX_RESOURCE_VBI)) {
+ videobuf_stop(&fh->vb_vbiq);
+ res_free(fh, EM28XX_RESOURCE_VBI);
+ }
+
+ if(dev->users == 1) {
/* the device is already disconnect,
free the remaining resources */
if (dev->state & DEV_DISCONNECTED) {
em28xx_release_resources(dev);
- mutex_unlock(&dev->lock);
kfree(dev);
return 0;
}
@@ -2197,15 +2221,11 @@ static int em28xx_v4l2_close(struct file *filp)
}
}
- if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
- videobuf_stop(&fh->vb_vbiq);
- videobuf_mmap_free(&fh->vb_vbiq);
- }
-
+ videobuf_mmap_free(&fh->vb_vidq);
+ videobuf_mmap_free(&fh->vb_vbiq);
kfree(fh);
dev->users--;
wake_up_interruptible_nr(&dev->open, 1);
- mutex_unlock(&dev->lock);
return 0;
}
@@ -2230,12 +2250,8 @@ em28xx_v4l2_read(struct file *filp, char __user *buf, size_t count,
*/
if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
- mutex_lock(&dev->lock);
- rc = res_get(fh);
- mutex_unlock(&dev->lock);
-
- if (unlikely(rc < 0))
- return rc;
+ if (res_locked(dev, EM28XX_RESOURCE_VIDEO))
+ return -EBUSY;
return videobuf_read_stream(&fh->vb_vidq, buf, count, pos, 0,
filp->f_flags & O_NONBLOCK);
@@ -2243,9 +2259,8 @@ em28xx_v4l2_read(struct file *filp, char __user *buf, size_t count,
if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
- mutex_lock(&dev->lock);
- rc = res_get(fh);
- mutex_unlock(&dev->lock);
+ if (!res_get(fh, EM28XX_RESOURCE_VBI))
+ return -EBUSY;
return videobuf_read_stream(&fh->vb_vbiq, buf, count, pos, 0,
filp->f_flags & O_NONBLOCK);
@@ -2268,19 +2283,17 @@ static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table *wait)
if (rc < 0)
return rc;
- mutex_lock(&dev->lock);
- rc = res_get(fh);
- mutex_unlock(&dev->lock);
-
- if (unlikely(rc < 0))
- return POLLERR;
-
- if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ if (!res_get(fh, EM28XX_RESOURCE_VIDEO))
+ return POLLERR;
return videobuf_poll_stream(filp, &fh->vb_vidq, wait);
- else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+ } else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
+ if (!res_get(fh, EM28XX_RESOURCE_VBI))
+ return POLLERR;
return videobuf_poll_stream(filp, &fh->vb_vbiq, wait);
- else
+ } else {
return POLLERR;
+ }
}
/*
@@ -2296,13 +2309,6 @@ static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
if (rc < 0)
return rc;
- mutex_lock(&dev->lock);
- rc = res_get(fh);
- mutex_unlock(&dev->lock);
-
- if (unlikely(rc < 0))
- return rc;
-
if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
rc = videobuf_mmap_mapper(&fh->vb_vidq, vma);
else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h
index 8dac50b9c00..b4a6e07236d 100644
--- a/drivers/media/video/em28xx/em28xx.h
+++ b/drivers/media/video/em28xx/em28xx.h
@@ -444,6 +444,10 @@ enum em28xx_dev_state {
#define EM28XX_AUDIO 0x10
#define EM28XX_DVB 0x20
+/* em28xx resource types (used for res_get/res_lock etc */
+#define EM28XX_RESOURCE_VIDEO 0x01
+#define EM28XX_RESOURCE_VBI 0x02
+
struct em28xx_audio {
char name[50];
char *transfer_buffer[EM28XX_AUDIO_BUFS];
@@ -464,8 +468,8 @@ struct em28xx;
struct em28xx_fh {
struct em28xx *dev;
- unsigned int stream_on:1; /* Locks streams */
int radio;
+ unsigned int resources;
struct videobuf_queue vb_vidq;
struct videobuf_queue vb_vbiq;
@@ -495,7 +499,6 @@ struct em28xx {
/* Vinmode/Vinctl used at the driver */
int vinmode, vinctl;
- unsigned int stream_on:1; /* Locks streams */
unsigned int has_audio_class:1;
unsigned int has_alsa_audio:1;
@@ -563,6 +566,9 @@ struct em28xx {
struct video_device *vbi_dev;
struct video_device *radio_dev;
+ /* resources in use */
+ unsigned int resources;
+
unsigned char eedata[256];
/* Isoc control struct */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-10-15 15:22:24 +0000