Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
diff --git a/drivers/media/video/bt8xx/bttv-driver.c b/drivers/media/video/bt8xx/bttv-driver.c
index fcafe2f..5f5cd4a 100644
--- a/drivers/media/video/bt8xx/bttv-driver.c
+++ b/drivers/media/video/bt8xx/bttv-driver.c
@@ -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;
- err = v4l2_prio_check(&btv->prio, fh->prio);
- if (0 != err)
- return err;
-
- if (i > bttv_tvcards[btv->c.type].video_inputs)
- return -EINVAL;
-
mutex_lock(&btv->lock);
+ err = v4l2_prio_check(&btv->prio, fh->prio);
+ if (unlikely(err))
+ goto err;
+
+ if (i > bttv_tvcards[btv->c.type].video_inputs) {
+ err = -EINVAL;
+ goto err;
+ }
+
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;
+
+ 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)))
- return -EINVAL;
- mutex_lock(&btv->lock);
+ ? 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;
}
@@ -2257,7 +2283,9 @@ verify_window_lock (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;
@@ -2332,6 +2360,8 @@ static int setup_window_lock(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_lock(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_lock(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;
@@ -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;
@@ -2730,16 +2773,22 @@ 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_lock(btv, fh, RESOURCE_OVERLAY))
@@ -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_lock(). */
mutex_lock(&btv->lock);
+ retval = v4l2_prio_check(&btv->prio, fh->prio);
+ if (0 != retval) {
+ mutex_unlock(&btv->lock);
+ return retval;
+ }
retval = -EBUSY;
@@ -3221,21 +3287,32 @@ 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,
@@ -3272,7 +3349,7 @@ 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 +3358,7 @@ 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);
@@ -3305,8 +3383,15 @@ static int bttv_release(struct file *file)
}
/* 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 +3401,7 @@ static int bttv_release(struct file *file)
if (!btv->users)
audio_mute(btv, 1);
+ mutex_unlock(&btv->lock);
return 0;
}
@@ -3412,21 +3498,19 @@ 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 +3518,6 @@ static int radio_open(struct file *file)
audio_input(btv,TVAUDIO_INPUT_RADIO);
mutex_unlock(&btv->lock);
- unlock_kernel();
return 0;
}
@@ -3444,6 +3527,7 @@ 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 +3535,7 @@ 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;
}
--
1.7.1
--
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