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path: root/drivers/media/video/cpia2
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Diffstat (limited to 'drivers/media/video/cpia2')
-rw-r--r--drivers/media/video/cpia2/cpia2.h2
-rw-r--r--drivers/media/video/cpia2/cpia2_core.c65
-rw-r--r--drivers/media/video/cpia2/cpia2_v4l.c104
3 files changed, 50 insertions, 121 deletions
diff --git a/drivers/media/video/cpia2/cpia2.h b/drivers/media/video/cpia2/cpia2.h
index 916c13d5cf7d..6d6d1843791c 100644
--- a/drivers/media/video/cpia2/cpia2.h
+++ b/drivers/media/video/cpia2/cpia2.h
@@ -378,7 +378,7 @@ struct cpia2_fh {
struct camera_data {
/* locks */
- struct mutex busy_lock; /* guard against SMP multithreading */
+ struct mutex v4l2_lock; /* serialize file operations */
struct v4l2_prio_state prio;
/* camera status */
diff --git a/drivers/media/video/cpia2/cpia2_core.c b/drivers/media/video/cpia2/cpia2_core.c
index 9606bc01b803..aaffca8e13fd 100644
--- a/drivers/media/video/cpia2/cpia2_core.c
+++ b/drivers/media/video/cpia2/cpia2_core.c
@@ -2247,7 +2247,7 @@ struct camera_data *cpia2_init_camera_struct(void)
cam->present = 1;
- mutex_init(&cam->busy_lock);
+ mutex_init(&cam->v4l2_lock);
init_waitqueue_head(&cam->wq_stream);
return cam;
@@ -2365,9 +2365,9 @@ long cpia2_read(struct camera_data *cam,
char __user *buf, unsigned long count, int noblock)
{
struct framebuf *frame;
- if (!count) {
+
+ if (!count)
return 0;
- }
if (!buf) {
ERR("%s: buffer NULL\n",__func__);
@@ -2379,17 +2379,12 @@ long cpia2_read(struct camera_data *cam,
return -EINVAL;
}
- /* make this _really_ smp and multithread-safe */
- if (mutex_lock_interruptible(&cam->busy_lock))
- return -ERESTARTSYS;
-
if (!cam->present) {
LOG("%s: camera removed\n",__func__);
- mutex_unlock(&cam->busy_lock);
return 0; /* EOF */
}
- if(!cam->streaming) {
+ if (!cam->streaming) {
/* Start streaming */
cpia2_usb_stream_start(cam,
cam->params.camera_state.stream_mode);
@@ -2398,42 +2393,31 @@ long cpia2_read(struct camera_data *cam,
/* Copy cam->curbuff in case it changes while we're processing */
frame = cam->curbuff;
if (noblock && frame->status != FRAME_READY) {
- mutex_unlock(&cam->busy_lock);
return -EAGAIN;
}
- if(frame->status != FRAME_READY) {
- mutex_unlock(&cam->busy_lock);
+ if (frame->status != FRAME_READY) {
+ mutex_unlock(&cam->v4l2_lock);
wait_event_interruptible(cam->wq_stream,
!cam->present ||
(frame = cam->curbuff)->status == FRAME_READY);
+ mutex_lock(&cam->v4l2_lock);
if (signal_pending(current))
return -ERESTARTSYS;
- /* make this _really_ smp and multithread-safe */
- if (mutex_lock_interruptible(&cam->busy_lock)) {
- return -ERESTARTSYS;
- }
- if(!cam->present) {
- mutex_unlock(&cam->busy_lock);
+ if (!cam->present)
return 0;
- }
}
/* copy data to user space */
- if (frame->length > count) {
- mutex_unlock(&cam->busy_lock);
+ if (frame->length > count)
return -EFAULT;
- }
- if (copy_to_user(buf, frame->data, frame->length)) {
- mutex_unlock(&cam->busy_lock);
+ if (copy_to_user(buf, frame->data, frame->length))
return -EFAULT;
- }
count = frame->length;
frame->status = FRAME_EMPTY;
- mutex_unlock(&cam->busy_lock);
return count;
}
@@ -2447,17 +2431,13 @@ unsigned int cpia2_poll(struct camera_data *cam, struct file *filp,
{
unsigned int status=0;
- if(!cam) {
+ if (!cam) {
ERR("%s: Internal error, camera_data not found!\n",__func__);
return POLLERR;
}
- mutex_lock(&cam->busy_lock);
-
- if(!cam->present) {
- mutex_unlock(&cam->busy_lock);
+ if (!cam->present)
return POLLHUP;
- }
if(!cam->streaming) {
/* Start streaming */
@@ -2465,16 +2445,13 @@ unsigned int cpia2_poll(struct camera_data *cam, struct file *filp,
cam->params.camera_state.stream_mode);
}
- mutex_unlock(&cam->busy_lock);
poll_wait(filp, &cam->wq_stream, wait);
- mutex_lock(&cam->busy_lock);
if(!cam->present)
status = POLLHUP;
else if(cam->curbuff->status == FRAME_READY)
status = POLLIN | POLLRDNORM;
- mutex_unlock(&cam->busy_lock);
return status;
}
@@ -2496,29 +2473,19 @@ int cpia2_remap_buffer(struct camera_data *cam, struct vm_area_struct *vma)
DBG("mmap offset:%ld size:%ld\n", start_offset, size);
- /* make this _really_ smp-safe */
- if (mutex_lock_interruptible(&cam->busy_lock))
- return -ERESTARTSYS;
-
- if (!cam->present) {
- mutex_unlock(&cam->busy_lock);
+ if (!cam->present)
return -ENODEV;
- }
if (size > cam->frame_size*cam->num_frames ||
(start_offset % cam->frame_size) != 0 ||
- (start_offset+size > cam->frame_size*cam->num_frames)) {
- mutex_unlock(&cam->busy_lock);
+ (start_offset+size > cam->frame_size*cam->num_frames))
return -EINVAL;
- }
pos = ((unsigned long) (cam->frame_buffer)) + start_offset;
while (size > 0) {
page = kvirt_to_pa(pos);
- if (remap_pfn_range(vma, start, page >> PAGE_SHIFT, PAGE_SIZE, PAGE_SHARED)) {
- mutex_unlock(&cam->busy_lock);
+ if (remap_pfn_range(vma, start, page >> PAGE_SHIFT, PAGE_SIZE, PAGE_SHARED))
return -EAGAIN;
- }
start += PAGE_SIZE;
pos += PAGE_SIZE;
if (size > PAGE_SIZE)
@@ -2528,7 +2495,5 @@ int cpia2_remap_buffer(struct camera_data *cam, struct vm_area_struct *vma)
}
cam->mmapped = true;
- mutex_unlock(&cam->busy_lock);
return 0;
}
-
diff --git a/drivers/media/video/cpia2/cpia2_v4l.c b/drivers/media/video/cpia2/cpia2_v4l.c
index 7edf80b0d01a..9bad39842936 100644
--- a/drivers/media/video/cpia2/cpia2_v4l.c
+++ b/drivers/media/video/cpia2/cpia2_v4l.c
@@ -238,59 +238,40 @@ static struct v4l2_queryctrl controls[] = {
static int cpia2_open(struct file *file)
{
struct camera_data *cam = video_drvdata(file);
- int retval = 0;
+ struct cpia2_fh *fh;
if (!cam) {
ERR("Internal error, camera_data not found!\n");
return -ENODEV;
}
- if(mutex_lock_interruptible(&cam->busy_lock))
- return -ERESTARTSYS;
-
- if(!cam->present) {
- retval = -ENODEV;
- goto err_return;
- }
+ if (!cam->present)
+ return -ENODEV;
- if (cam->open_count > 0) {
- goto skip_init;
- }
+ if (cam->open_count == 0) {
+ if (cpia2_allocate_buffers(cam))
+ return -ENOMEM;
- if (cpia2_allocate_buffers(cam)) {
- retval = -ENOMEM;
- goto err_return;
- }
+ /* reset the camera */
+ if (cpia2_reset_camera(cam) < 0)
+ return -EIO;
- /* reset the camera */
- if (cpia2_reset_camera(cam) < 0) {
- retval = -EIO;
- goto err_return;
+ cam->APP_len = 0;
+ cam->COM_len = 0;
}
- cam->APP_len = 0;
- cam->COM_len = 0;
-
-skip_init:
- {
- struct cpia2_fh *fh = kmalloc(sizeof(*fh),GFP_KERNEL);
- if(!fh) {
- retval = -ENOMEM;
- goto err_return;
- }
- file->private_data = fh;
- fh->prio = V4L2_PRIORITY_UNSET;
- v4l2_prio_open(&cam->prio, &fh->prio);
- fh->mmapped = 0;
- }
+ fh = kmalloc(sizeof(*fh), GFP_KERNEL);
+ if (!fh)
+ return -ENOMEM;
+ file->private_data = fh;
+ fh->prio = V4L2_PRIORITY_UNSET;
+ v4l2_prio_open(&cam->prio, &fh->prio);
+ fh->mmapped = 0;
++cam->open_count;
cpia2_dbg_dump_registers(cam);
-
-err_return:
- mutex_unlock(&cam->busy_lock);
- return retval;
+ return 0;
}
/******************************************************************************
@@ -304,15 +285,11 @@ static int cpia2_close(struct file *file)
struct camera_data *cam = video_get_drvdata(dev);
struct cpia2_fh *fh = file->private_data;
- mutex_lock(&cam->busy_lock);
-
if (cam->present &&
- (cam->open_count == 1
- || fh->prio == V4L2_PRIORITY_RECORD
- )) {
+ (cam->open_count == 1 || fh->prio == V4L2_PRIORITY_RECORD)) {
cpia2_usb_stream_stop(cam);
- if(cam->open_count == 1) {
+ if (cam->open_count == 1) {
/* save camera state for later open */
cpia2_save_camera_state(cam);
@@ -321,26 +298,21 @@ static int cpia2_close(struct file *file)
}
}
- {
- if(fh->mmapped)
- cam->mmapped = 0;
- v4l2_prio_close(&cam->prio, fh->prio);
- file->private_data = NULL;
- kfree(fh);
- }
+ if (fh->mmapped)
+ cam->mmapped = 0;
+ v4l2_prio_close(&cam->prio, fh->prio);
+ file->private_data = NULL;
+ kfree(fh);
if (--cam->open_count == 0) {
cpia2_free_buffers(cam);
if (!cam->present) {
video_unregister_device(dev);
- mutex_unlock(&cam->busy_lock);
kfree(cam);
return 0;
}
}
- mutex_unlock(&cam->busy_lock);
-
return 0;
}
@@ -405,11 +377,11 @@ static int sync(struct camera_data *cam, int frame_nr)
return 0;
}
- mutex_unlock(&cam->busy_lock);
+ mutex_unlock(&cam->v4l2_lock);
wait_event_interruptible(cam->wq_stream,
!cam->streaming ||
frame->status == FRAME_READY);
- mutex_lock(&cam->busy_lock);
+ mutex_lock(&cam->v4l2_lock);
if (signal_pending(current))
return -ERESTARTSYS;
if(!cam->present)
@@ -1293,11 +1265,11 @@ static int ioctl_dqbuf(void *arg,struct camera_data *cam, struct file *file)
if(frame < 0) {
/* Wait for a frame to become available */
struct framebuf *cb=cam->curbuff;
- mutex_unlock(&cam->busy_lock);
+ mutex_unlock(&cam->v4l2_lock);
wait_event_interruptible(cam->wq_stream,
!cam->present ||
(cb=cam->curbuff)->status == FRAME_READY);
- mutex_lock(&cam->busy_lock);
+ mutex_lock(&cam->v4l2_lock);
if (signal_pending(current))
return -ERESTARTSYS;
if(!cam->present)
@@ -1337,14 +1309,8 @@ static long cpia2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
if (!cam)
return -ENOTTY;
- /* make this _really_ smp-safe */
- if (mutex_lock_interruptible(&cam->busy_lock))
- return -ERESTARTSYS;
-
- if (!cam->present) {
- mutex_unlock(&cam->busy_lock);
+ if (!cam->present)
return -ENODEV;
- }
/* Priority check */
switch (cmd) {
@@ -1352,10 +1318,8 @@ static long cpia2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
{
struct cpia2_fh *fh = file->private_data;
retval = v4l2_prio_check(&cam->prio, fh->prio);
- if(retval) {
- mutex_unlock(&cam->busy_lock);
+ if (retval)
return retval;
- }
break;
}
default:
@@ -1529,7 +1493,6 @@ static long cpia2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
break;
}
- mutex_unlock(&cam->busy_lock);
return retval;
}
@@ -1596,7 +1559,7 @@ static const struct v4l2_file_operations cpia2_fops = {
.release = cpia2_close,
.read = cpia2_v4l_read,
.poll = cpia2_v4l_poll,
- .ioctl = cpia2_ioctl,
+ .unlocked_ioctl = cpia2_ioctl,
.mmap = cpia2_mmap,
};
@@ -1620,6 +1583,7 @@ int cpia2_register_camera(struct camera_data *cam)
memcpy(cam->vdev, &cpia2_template, sizeof(cpia2_template));
video_set_drvdata(cam->vdev, cam);
+ cam->vdev->lock = &cam->v4l2_lock;
reset_camera_struct_v4l(cam);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-07 06:41:55 +0000