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path: root/drivers/media/video/cpia2/cpia2_core.c
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Diffstat (limited to 'drivers/media/video/cpia2/cpia2_core.c')
-rw-r--r--drivers/media/video/cpia2/cpia2_core.c65
1 files changed, 15 insertions, 50 deletions
diff --git a/drivers/media/video/cpia2/cpia2_core.c b/drivers/media/video/cpia2/cpia2_core.c
index 9606bc01b80..aaffca8e13f 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;
}
-