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path: root/drivers/media/video/bt8xx/bttv-driver.c
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Diffstat (limited to 'drivers/media/video/bt8xx/bttv-driver.c')
-rw-r--r--drivers/media/video/bt8xx/bttv-driver.c273
1 files changed, 178 insertions, 95 deletions
diff --git a/drivers/media/video/bt8xx/bttv-driver.c b/drivers/media/video/bt8xx/bttv-driver.c
index 38c7f78ad9c..3da6e80e104 100644
--- a/drivers/media/video/bt8xx/bttv-driver.c
+++ b/drivers/media/video/bt8xx/bttv-driver.c
@@ -842,7 +842,7 @@ static const struct v4l2_queryctrl *ctrl_by_id(int id)
RESOURCE_OVERLAY)
static
-int check_alloc_btres(struct bttv *btv, struct bttv_fh *fh, int bit)
+int check_alloc_btres_lock(struct bttv *btv, struct bttv_fh *fh, int bit)
{
int xbits; /* mutual exclusive resources */
@@ -935,7 +935,7 @@ disclaim_video_lines(struct bttv *btv)
}
static
-void free_btres(struct bttv *btv, struct bttv_fh *fh, int bits)
+void free_btres_lock(struct bttv *btv, struct bttv_fh *fh, int bits)
{
if ((fh->resources & bits) != bits) {
/* trying to free ressources not allocated by us ... */
@@ -1682,7 +1682,7 @@ bttv_switch_overlay(struct bttv *btv, struct bttv_fh *fh,
kfree(old);
}
if (NULL == new)
- free_btres(btv,fh,RESOURCE_OVERLAY);
+ free_btres_lock(btv,fh,RESOURCE_OVERLAY);
dprintk("switch_overlay: done\n");
return retval;
}
@@ -1859,21 +1859,25 @@ static int bttv_s_std(struct file *file, void *priv, v4l2_std_id *id)
unsigned int i;
int err;
+ mutex_lock(&btv->lock);
err = v4l2_prio_check(&btv->prio, fh->prio);
- if (0 != err)
- return err;
+ if (err)
+ goto err;
for (i = 0; i < BTTV_TVNORMS; i++)
if (*id & bttv_tvnorms[i].v4l2_id)
break;
- if (i == BTTV_TVNORMS)
- return -EINVAL;
+ if (i == BTTV_TVNORMS) {
+ err = -EINVAL;
+ goto err;
+ }
- mutex_lock(&btv->lock);
set_tvnorm(btv, i);
+
+err:
mutex_unlock(&btv->lock);
- return 0;
+ return err;
}
static int bttv_querystd(struct file *file, void *f, v4l2_std_id *id)
@@ -1893,10 +1897,13 @@ static int bttv_enum_input(struct file *file, void *priv,
{
struct bttv_fh *fh = priv;
struct bttv *btv = fh->btv;
- int n;
+ int rc = 0;
- if (i->index >= bttv_tvcards[btv->c.type].video_inputs)
- return -EINVAL;
+ mutex_lock(&btv->lock);
+ if (i->index >= bttv_tvcards[btv->c.type].video_inputs) {
+ rc = -EINVAL;
+ goto err;
+ }
i->type = V4L2_INPUT_TYPE_CAMERA;
i->audioset = 1;
@@ -1919,10 +1926,12 @@ static int bttv_enum_input(struct file *file, void *priv,
i->status |= V4L2_IN_ST_NO_H_LOCK;
}
- for (n = 0; n < BTTV_TVNORMS; n++)
- i->std |= bttv_tvnorms[n].v4l2_id;
+ i->std = BTTV_NORMS;
- return 0;
+err:
+ mutex_unlock(&btv->lock);
+
+ return rc;
}
static int bttv_g_input(struct file *file, void *priv, unsigned int *i)
@@ -1930,7 +1939,10 @@ static int bttv_g_input(struct file *file, void *priv, unsigned int *i)
struct bttv_fh *fh = priv;
struct bttv *btv = fh->btv;
+ mutex_lock(&btv->lock);
*i = btv->input;
+ mutex_unlock(&btv->lock);
+
return 0;
}
@@ -1941,15 +1953,19 @@ static int bttv_s_input(struct file *file, void *priv, unsigned int i)
int err;
+ mutex_lock(&btv->lock);
err = v4l2_prio_check(&btv->prio, fh->prio);
- if (0 != err)
- return err;
+ if (unlikely(err))
+ goto err;
- if (i > bttv_tvcards[btv->c.type].video_inputs)
- return -EINVAL;
+ if (i > bttv_tvcards[btv->c.type].video_inputs) {
+ err = -EINVAL;
+ goto err;
+ }
- mutex_lock(&btv->lock);
set_input(btv, i, btv->tvnorm);
+
+err:
mutex_unlock(&btv->lock);
return 0;
}
@@ -1961,22 +1977,25 @@ static int bttv_s_tuner(struct file *file, void *priv,
struct bttv *btv = fh->btv;
int err;
- err = v4l2_prio_check(&btv->prio, fh->prio);
- if (0 != err)
- return err;
-
- if (btv->tuner_type == TUNER_ABSENT)
- return -EINVAL;
-
- if (0 != t->index)
+ if (unlikely(0 != t->index))
return -EINVAL;
mutex_lock(&btv->lock);
+ if (unlikely(btv->tuner_type == TUNER_ABSENT)) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ err = v4l2_prio_check(&btv->prio, fh->prio);
+ if (unlikely(err))
+ goto err;
+
bttv_call_all(btv, tuner, s_tuner, t);
if (btv->audio_mode_gpio)
btv->audio_mode_gpio(btv, t, 1);
+err:
mutex_unlock(&btv->lock);
return 0;
@@ -1988,8 +2007,10 @@ static int bttv_g_frequency(struct file *file, void *priv,
struct bttv_fh *fh = priv;
struct bttv *btv = fh->btv;
+ mutex_lock(&btv->lock);
f->type = btv->radio_user ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
f->frequency = btv->freq;
+ mutex_unlock(&btv->lock);
return 0;
}
@@ -2001,21 +2022,26 @@ static int bttv_s_frequency(struct file *file, void *priv,
struct bttv *btv = fh->btv;
int err;
- err = v4l2_prio_check(&btv->prio, fh->prio);
- if (0 != err)
- return err;
-
if (unlikely(f->tuner != 0))
return -EINVAL;
- if (unlikely(f->type != (btv->radio_user
- ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV)))
- return -EINVAL;
+
mutex_lock(&btv->lock);
+ err = v4l2_prio_check(&btv->prio, fh->prio);
+ if (unlikely(err))
+ goto err;
+
+ if (unlikely(f->type != (btv->radio_user
+ ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV))) {
+ err = -EINVAL;
+ goto err;
+ }
btv->freq = f->frequency;
bttv_call_all(btv, tuner, s_frequency, f);
if (btv->has_matchbox && btv->radio_user)
tea5757_set_freq(btv, btv->freq);
+err:
mutex_unlock(&btv->lock);
+
return 0;
}
@@ -2124,7 +2150,7 @@ bttv_crop_adjust (struct bttv_crop * c,
also adjust the current cropping parameters to get closer to the
desired image size. */
static int
-limit_scaled_size (struct bttv_fh * fh,
+limit_scaled_size_lock (struct bttv_fh * fh,
__s32 * width,
__s32 * height,
enum v4l2_field field,
@@ -2238,7 +2264,7 @@ limit_scaled_size (struct bttv_fh * fh,
may also adjust the current cropping parameters to get closer
to the desired window size. */
static int
-verify_window (struct bttv_fh * fh,
+verify_window_lock (struct bttv_fh * fh,
struct v4l2_window * win,
int adjust_size,
int adjust_crop)
@@ -2257,7 +2283,9 @@ verify_window (struct bttv_fh * fh,
if (V4L2_FIELD_ANY == field) {
__s32 height2;
+ mutex_lock(&fh->btv->lock);
height2 = fh->btv->crop[!!fh->do_crop].rect.height >> 1;
+ mutex_unlock(&fh->btv->lock);
field = (win->w.height > height2)
? V4L2_FIELD_INTERLACED
: V4L2_FIELD_TOP;
@@ -2292,7 +2320,7 @@ verify_window (struct bttv_fh * fh,
win->w.width -= win->w.left & ~width_mask;
win->w.left = (win->w.left - width_mask - 1) & width_mask;
- rc = limit_scaled_size(fh, &win->w.width, &win->w.height,
+ rc = limit_scaled_size_lock(fh, &win->w.width, &win->w.height,
field, width_mask,
/* width_bias: round down */ 0,
adjust_size, adjust_crop);
@@ -2303,7 +2331,7 @@ verify_window (struct bttv_fh * fh,
return 0;
}
-static int setup_window(struct bttv_fh *fh, struct bttv *btv,
+static int setup_window_lock(struct bttv_fh *fh, struct bttv *btv,
struct v4l2_window *win, int fixup)
{
struct v4l2_clip *clips = NULL;
@@ -2313,7 +2341,7 @@ static int setup_window(struct bttv_fh *fh, struct bttv *btv,
return -EINVAL;
if (!(fh->ovfmt->flags & FORMAT_FLAGS_PACKED))
return -EINVAL;
- retval = verify_window(fh, win,
+ retval = verify_window_lock(fh, win,
/* adjust_size */ fixup,
/* adjust_crop */ fixup);
if (0 != retval)
@@ -2332,6 +2360,8 @@ static int setup_window(struct bttv_fh *fh, struct bttv *btv,
return -EFAULT;
}
}
+
+ mutex_lock(&fh->cap.vb_lock);
/* clip against screen */
if (NULL != btv->fbuf.base)
n = btcx_screen_clips(btv->fbuf.fmt.width, btv->fbuf.fmt.height,
@@ -2354,7 +2384,6 @@ static int setup_window(struct bttv_fh *fh, struct bttv *btv,
BUG();
}
- mutex_lock(&fh->cap.vb_lock);
kfree(fh->ov.clips);
fh->ov.clips = clips;
fh->ov.nclips = n;
@@ -2362,6 +2391,14 @@ static int setup_window(struct bttv_fh *fh, struct bttv *btv,
fh->ov.w = win->w;
fh->ov.field = win->field;
fh->ov.setup_ok = 1;
+
+ /*
+ * FIXME: btv is protected by btv->lock mutex, while btv->init
+ * is protected by fh->cap.vb_lock. This seems to open the
+ * possibility for some race situations. Maybe the better would
+ * be to unify those locks or to use another way to store the
+ * init values that will be consumed by videobuf callbacks
+ */
btv->init.ov.w.width = win->w.width;
btv->init.ov.w.height = win->w.height;
btv->init.ov.field = win->field;
@@ -2490,7 +2527,9 @@ static int bttv_try_fmt_vid_cap(struct file *file, void *priv,
if (V4L2_FIELD_ANY == field) {
__s32 height2;
+ mutex_lock(&btv->lock);
height2 = btv->crop[!!fh->do_crop].rect.height >> 1;
+ mutex_unlock(&btv->lock);
field = (f->fmt.pix.height > height2)
? V4L2_FIELD_INTERLACED
: V4L2_FIELD_BOTTOM;
@@ -2516,7 +2555,7 @@ static int bttv_try_fmt_vid_cap(struct file *file, void *priv,
width = f->fmt.pix.width;
height = f->fmt.pix.height;
- rc = limit_scaled_size(fh, &width, &height, field,
+ rc = limit_scaled_size_lock(fh, &width, &height, field,
/* width_mask: 4 pixels */ ~3,
/* width_bias: nearest */ 2,
/* adjust_size */ 1,
@@ -2536,7 +2575,7 @@ static int bttv_try_fmt_vid_overlay(struct file *file, void *priv,
{
struct bttv_fh *fh = priv;
- return verify_window(fh, &f->fmt.win,
+ return verify_window_lock(fh, &f->fmt.win,
/* adjust_size */ 1,
/* adjust_crop */ 0);
}
@@ -2563,7 +2602,7 @@ static int bttv_s_fmt_vid_cap(struct file *file, void *priv,
height = f->fmt.pix.height;
field = f->fmt.pix.field;
- retval = limit_scaled_size(fh, &width, &height, f->fmt.pix.field,
+ retval = limit_scaled_size_lock(fh, &width, &height, f->fmt.pix.field,
/* width_mask: 4 pixels */ ~3,
/* width_bias: nearest */ 2,
/* adjust_size */ 1,
@@ -2601,7 +2640,7 @@ static int bttv_s_fmt_vid_overlay(struct file *file, void *priv,
return -EINVAL;
}
- return setup_window(fh, btv, &f->fmt.win, 1);
+ return setup_window_lock(fh, btv, &f->fmt.win, 1);
}
#ifdef CONFIG_VIDEO_V4L1_COMPAT
@@ -2651,11 +2690,15 @@ static int bttv_querycap(struct file *file, void *priv,
V4L2_CAP_VBI_CAPTURE |
V4L2_CAP_READWRITE |
V4L2_CAP_STREAMING;
- if (btv->has_saa6588)
- cap->capabilities |= V4L2_CAP_RDS_CAPTURE;
if (no_overlay <= 0)
cap->capabilities |= V4L2_CAP_VIDEO_OVERLAY;
+ /*
+ * No need to lock here: those vars are initialized during board
+ * probe and remains untouched during the rest of the driver lifecycle
+ */
+ if (btv->has_saa6588)
+ cap->capabilities |= V4L2_CAP_RDS_CAPTURE;
if (btv->tuner_type != TUNER_ABSENT)
cap->capabilities |= V4L2_CAP_TUNER;
return 0;
@@ -2730,19 +2773,25 @@ static int bttv_overlay(struct file *file, void *f, unsigned int on)
struct bttv_fh *fh = f;
struct bttv *btv = fh->btv;
struct bttv_buffer *new;
- int retval;
+ int retval = 0;
if (on) {
+ mutex_lock(&fh->cap.vb_lock);
/* verify args */
- if (NULL == btv->fbuf.base)
+ if (unlikely(!btv->fbuf.base)) {
+ mutex_unlock(&fh->cap.vb_lock);
return -EINVAL;
- if (!fh->ov.setup_ok) {
+ }
+ if (unlikely(!fh->ov.setup_ok)) {
dprintk("bttv%d: overlay: !setup_ok\n", btv->c.nr);
- return -EINVAL;
+ retval = -EINVAL;
}
+ if (retval)
+ return retval;
+ mutex_unlock(&fh->cap.vb_lock);
}
- if (!check_alloc_btres(btv, fh, RESOURCE_OVERLAY))
+ if (!check_alloc_btres_lock(btv, fh, RESOURCE_OVERLAY))
return -EBUSY;
mutex_lock(&fh->cap.vb_lock);
@@ -2785,7 +2834,7 @@ static int bttv_s_fbuf(struct file *file, void *f,
__s32 width = fb->fmt.width;
__s32 height = fb->fmt.height;
- retval = limit_scaled_size(fh, &width, &height,
+ retval = limit_scaled_size_lock(fh, &width, &height,
V4L2_FIELD_INTERLACED,
/* width_mask */ ~3,
/* width_bias */ 2,
@@ -2852,7 +2901,7 @@ static int bttv_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
struct bttv *btv = fh->btv;
int res = bttv_resource(fh);
- if (!check_alloc_btres(btv, fh, res))
+ if (!check_alloc_btres_lock(btv, fh, res))
return -EBUSY;
return videobuf_qbuf(bttv_queue(fh), b);
@@ -2872,7 +2921,7 @@ static int bttv_streamon(struct file *file, void *priv,
struct bttv *btv = fh->btv;
int res = bttv_resource(fh);
- if (!check_alloc_btres(btv, fh, res))
+ if (!check_alloc_btres_lock(btv, fh, res))
return -EBUSY;
return videobuf_streamon(bttv_queue(fh));
}
@@ -2890,7 +2939,7 @@ static int bttv_streamoff(struct file *file, void *priv,
retval = videobuf_streamoff(bttv_queue(fh));
if (retval < 0)
return retval;
- free_btres(btv, fh, res);
+ free_btres_lock(btv, fh, res);
return 0;
}
@@ -2907,6 +2956,7 @@ static int bttv_queryctrl(struct file *file, void *priv,
c->id >= V4L2_CID_PRIVATE_LASTP1))
return -EINVAL;
+ mutex_lock(&btv->lock);
if (!btv->volume_gpio && (c->id == V4L2_CID_AUDIO_VOLUME))
*c = no_ctl;
else {
@@ -2914,6 +2964,7 @@ static int bttv_queryctrl(struct file *file, void *priv,
*c = (NULL != ctrl) ? *ctrl : no_ctl;
}
+ mutex_unlock(&btv->lock);
return 0;
}
@@ -2924,8 +2975,11 @@ static int bttv_g_parm(struct file *file, void *f,
struct bttv_fh *fh = f;
struct bttv *btv = fh->btv;
+ mutex_lock(&btv->lock);
v4l2_video_std_frame_period(bttv_tvnorms[btv->tvnorm].v4l2_id,
&parm->parm.capture.timeperframe);
+ mutex_unlock(&btv->lock);
+
return 0;
}
@@ -2961,7 +3015,9 @@ static int bttv_g_priority(struct file *file, void *f, enum v4l2_priority *p)
struct bttv_fh *fh = f;
struct bttv *btv = fh->btv;
+ mutex_lock(&btv->lock);
*p = v4l2_prio_max(&btv->prio);
+ mutex_unlock(&btv->lock);
return 0;
}
@@ -2971,8 +3027,13 @@ static int bttv_s_priority(struct file *file, void *f,
{
struct bttv_fh *fh = f;
struct bttv *btv = fh->btv;
+ int rc;
- return v4l2_prio_change(&btv->prio, &fh->prio, prio);
+ mutex_lock(&btv->lock);
+ rc = v4l2_prio_change(&btv->prio, &fh->prio, prio);
+ mutex_unlock(&btv->lock);
+
+ return rc;
}
static int bttv_cropcap(struct file *file, void *priv,
@@ -2985,7 +3046,9 @@ static int bttv_cropcap(struct file *file, void *priv,
cap->type != V4L2_BUF_TYPE_VIDEO_OVERLAY)
return -EINVAL;
+ mutex_lock(&btv->lock);
*cap = bttv_tvnorms[btv->tvnorm].cropcap;
+ mutex_unlock(&btv->lock);
return 0;
}
@@ -3003,7 +3066,9 @@ static int bttv_g_crop(struct file *file, void *f, struct v4l2_crop *crop)
inconsistent with fh->width or fh->height and apps
do not expect a change here. */
+ mutex_lock(&btv->lock);
crop->c = btv->crop[!!fh->do_crop].rect;
+ mutex_unlock(&btv->lock);
return 0;
}
@@ -3024,14 +3089,15 @@ static int bttv_s_crop(struct file *file, void *f, struct v4l2_crop *crop)
crop->type != V4L2_BUF_TYPE_VIDEO_OVERLAY)
return -EINVAL;
- retval = v4l2_prio_check(&btv->prio, fh->prio);
- if (0 != retval)
- return retval;
-
/* Make sure tvnorm, vbi_end and the current cropping
parameters remain consistent until we're done. Note
- read() may change vbi_end in check_alloc_btres(). */
+ read() may change vbi_end in check_alloc_btres_lock(). */
mutex_lock(&btv->lock);
+ retval = v4l2_prio_check(&btv->prio, fh->prio);
+ if (0 != retval) {
+ mutex_unlock(&btv->lock);
+ return retval;
+ }
retval = -EBUSY;
@@ -3128,17 +3194,17 @@ static ssize_t bttv_read(struct file *file, char __user *data,
switch (fh->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
- if (!check_alloc_btres(fh->btv, fh, RESOURCE_VIDEO_READ)) {
+ if (!check_alloc_btres_lock(fh->btv, fh, RESOURCE_VIDEO_READ)) {
/* VIDEO_READ in use by another fh,
or VIDEO_STREAM by any fh. */
return -EBUSY;
}
retval = videobuf_read_one(&fh->cap, data, count, ppos,
file->f_flags & O_NONBLOCK);
- free_btres(fh->btv, fh, RESOURCE_VIDEO_READ);
+ free_btres_lock(fh->btv, fh, RESOURCE_VIDEO_READ);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
- if (!check_alloc_btres(fh->btv,fh,RESOURCE_VBI))
+ if (!check_alloc_btres_lock(fh->btv,fh,RESOURCE_VBI))
return -EBUSY;
retval = videobuf_read_stream(&fh->vbi, data, count, ppos, 1,
file->f_flags & O_NONBLOCK);
@@ -3157,20 +3223,19 @@ static unsigned int bttv_poll(struct file *file, poll_table *wait)
unsigned int rc = POLLERR;
if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type) {
- if (!check_alloc_btres(fh->btv,fh,RESOURCE_VBI))
+ if (!check_alloc_btres_lock(fh->btv,fh,RESOURCE_VBI))
return POLLERR;
return videobuf_poll_stream(file, &fh->vbi, wait);
}
+ mutex_lock(&fh->cap.vb_lock);
if (check_btres(fh,RESOURCE_VIDEO_STREAM)) {
- mutex_lock(&fh->cap.vb_lock);
/* streaming capture */
if (list_empty(&fh->cap.stream))
goto err;
buf = list_entry(fh->cap.stream.next,struct bttv_buffer,vb.stream);
} else {
/* read() capture */
- mutex_lock(&fh->cap.vb_lock);
if (NULL == fh->cap.read_buf) {
/* need to capture a new frame */
if (locked_btres(fh->btv,RESOURCE_VIDEO_STREAM))
@@ -3188,7 +3253,6 @@ static unsigned int bttv_poll(struct file *file, poll_table *wait)
fh->cap.ops->buf_queue(&fh->cap,fh->cap.read_buf);
fh->cap.read_off = 0;
}
- mutex_unlock(&fh->cap.vb_lock);
buf = (struct bttv_buffer*)fh->cap.read_buf;
}
@@ -3221,21 +3285,32 @@ static int bttv_open(struct file *file)
return -ENODEV;
}
- lock_kernel();
-
dprintk(KERN_DEBUG "bttv%d: open called (type=%s)\n",
btv->c.nr,v4l2_type_names[type]);
/* allocate per filehandle data */
- fh = kmalloc(sizeof(*fh),GFP_KERNEL);
- if (NULL == fh) {
- unlock_kernel();
+ fh = kmalloc(sizeof(*fh), GFP_KERNEL);
+ if (unlikely(!fh))
return -ENOMEM;
- }
file->private_data = fh;
+
+ /*
+ * btv is protected by btv->lock mutex, while btv->init and other
+ * streaming vars are protected by fh->cap.vb_lock. We need to take
+ * care of both locks to avoid troubles. However, vb_lock is used also
+ * inside videobuf, without calling buf->lock. So, it is a very bad
+ * idea to hold both locks at the same time.
+ * Let's first copy btv->init at fh, holding cap.vb_lock, and then work
+ * with the rest of init, holding btv->lock.
+ */
+ mutex_lock(&fh->cap.vb_lock);
*fh = btv->init;
+ mutex_unlock(&fh->cap.vb_lock);
+
fh->type = type;
fh->ov.setup_ok = 0;
+
+ mutex_lock(&btv->lock);
v4l2_prio_open(&btv->prio, &fh->prio);
videobuf_queue_sg_init(&fh->cap, &bttv_video_qops,
@@ -3243,13 +3318,13 @@ static int bttv_open(struct file *file)
V4L2_BUF_TYPE_VIDEO_CAPTURE,
V4L2_FIELD_INTERLACED,
sizeof(struct bttv_buffer),
- fh);
+ fh, NULL);
videobuf_queue_sg_init(&fh->vbi, &bttv_vbi_qops,
&btv->c.pci->dev, &btv->s_lock,
V4L2_BUF_TYPE_VBI_CAPTURE,
V4L2_FIELD_SEQ_TB,
sizeof(struct bttv_buffer),
- fh);
+ fh, NULL);
set_tvnorm(btv,btv->tvnorm);
set_input(btv, btv->input, btv->tvnorm);
@@ -3272,7 +3347,7 @@ static int bttv_open(struct file *file)
bttv_vbi_fmt_reset(&fh->vbi_fmt, btv->tvnorm);
bttv_field_count(btv);
- unlock_kernel();
+ mutex_unlock(&btv->lock);
return 0;
}
@@ -3281,6 +3356,7 @@ static int bttv_release(struct file *file)
struct bttv_fh *fh = file->private_data;
struct bttv *btv = fh->btv;
+ mutex_lock(&btv->lock);
/* turn off overlay */
if (check_btres(fh, RESOURCE_OVERLAY))
bttv_switch_overlay(btv,fh,NULL);
@@ -3288,25 +3364,32 @@ static int bttv_release(struct file *file)
/* stop video capture */
if (check_btres(fh, RESOURCE_VIDEO_STREAM)) {
videobuf_streamoff(&fh->cap);
- free_btres(btv,fh,RESOURCE_VIDEO_STREAM);
+ free_btres_lock(btv,fh,RESOURCE_VIDEO_STREAM);
}
if (fh->cap.read_buf) {
buffer_release(&fh->cap,fh->cap.read_buf);
kfree(fh->cap.read_buf);
}
if (check_btres(fh, RESOURCE_VIDEO_READ)) {
- free_btres(btv, fh, RESOURCE_VIDEO_READ);
+ free_btres_lock(btv, fh, RESOURCE_VIDEO_READ);
}
/* stop vbi capture */
if (check_btres(fh, RESOURCE_VBI)) {
videobuf_stop(&fh->vbi);
- free_btres(btv,fh,RESOURCE_VBI);
+ free_btres_lock(btv,fh,RESOURCE_VBI);
}
/* free stuff */
+
+ /*
+ * videobuf uses cap.vb_lock - we should avoid holding btv->lock,
+ * otherwise we may have dead lock conditions
+ */
+ mutex_unlock(&btv->lock);
videobuf_mmap_free(&fh->cap);
videobuf_mmap_free(&fh->vbi);
+ mutex_lock(&btv->lock);
v4l2_prio_close(&btv->prio, fh->prio);
file->private_data = NULL;
kfree(fh);
@@ -3316,6 +3399,7 @@ static int bttv_release(struct file *file)
if (!btv->users)
audio_mute(btv, 1);
+ mutex_unlock(&btv->lock);
return 0;
}
@@ -3333,13 +3417,13 @@ bttv_mmap(struct file *file, struct vm_area_struct *vma)
static const struct v4l2_file_operations bttv_fops =
{
- .owner = THIS_MODULE,
- .open = bttv_open,
- .release = bttv_release,
- .ioctl = video_ioctl2,
- .read = bttv_read,
- .mmap = bttv_mmap,
- .poll = bttv_poll,
+ .owner = THIS_MODULE,
+ .open = bttv_open,
+ .release = bttv_release,
+ .unlocked_ioctl = video_ioctl2,
+ .read = bttv_read,
+ .mmap = bttv_mmap,
+ .poll = bttv_poll,
};
static const struct v4l2_ioctl_ops bttv_ioctl_ops = {
@@ -3412,21 +3496,19 @@ static int radio_open(struct file *file)
dprintk("bttv: open dev=%s\n", video_device_node_name(vdev));
- lock_kernel();
-
dprintk("bttv%d: open called (radio)\n",btv->c.nr);
/* allocate per filehandle data */
fh = kmalloc(sizeof(*fh), GFP_KERNEL);
- if (NULL == fh) {
- unlock_kernel();
+ if (unlikely(!fh))
return -ENOMEM;
- }
file->private_data = fh;
+ mutex_lock(&fh->cap.vb_lock);
*fh = btv->init;
- v4l2_prio_open(&btv->prio, &fh->prio);
+ mutex_unlock(&fh->cap.vb_lock);
mutex_lock(&btv->lock);
+ v4l2_prio_open(&btv->prio, &fh->prio);
btv->radio_user++;
@@ -3434,7 +3516,6 @@ static int radio_open(struct file *file)
audio_input(btv,TVAUDIO_INPUT_RADIO);
mutex_unlock(&btv->lock);
- unlock_kernel();
return 0;
}
@@ -3444,6 +3525,7 @@ static int radio_release(struct file *file)
struct bttv *btv = fh->btv;
struct rds_command cmd;
+ mutex_lock(&btv->lock);
v4l2_prio_close(&btv->prio, fh->prio);
file->private_data = NULL;
kfree(fh);
@@ -3451,6 +3533,7 @@ static int radio_release(struct file *file)
btv->radio_user--;
bttv_call_all(btv, core, ioctl, RDS_CMD_CLOSE, &cmd);
+ mutex_unlock(&btv->lock);
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 02:48:45 +0000