V4L/DVB (8338): soc_camera: Move spinlocks

This patch moves the spinlock handling from soc_camera.c to the actual
camera host driver. The spinlock_alloc/free callbacks are replaced with
code in init_videobuf(). So far all camera host drivers implement their
own spinlock_alloc/free methods anyway, and videobuf_queue_core_init()
BUGs on a NULL spinlock argument, so, new camera host drivers will not
forget to provide a spinlock when initialising their videobuf queues.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 1 insertions, 38 deletions

diff --git a/drivers/media/video/soc_camera.c b/drivers/media/video/soc_camera.c
index 38a89f133164..e39b98f1eca4 100644
--- a/drivers/media/video/soc_camera.c
+++ b/drivers/media/video/soc_camera.c
@@ -183,7 +183,6 @@ static int soc_camera_open(struct inode *inode, struct file *file)
         struct soc_camera_device *icd;
         struct soc_camera_host *ici;
         struct soc_camera_file *icf;
-        spinlock_t *lock;
         int ret;
 
         icf = vmalloc(sizeof(*icf));
@@ -210,13 +209,6 @@ static int soc_camera_open(struct inode *inode, struct file *file)
         }
 
         icf->icd = icd;
-
-        icf->lock = ici->ops->spinlock_alloc(icf);
-        if (!icf->lock) {
-                ret = -ENOMEM;
-                goto esla;
-        }
-
         icd->use_count++;
 
         /* Now we really have to activate the camera */
@@ -234,17 +226,12 @@ static int soc_camera_open(struct inode *inode, struct file *file)
         file->private_data = icf;
         dev_dbg(&icd->dev, "camera device open\n");
 
-        ici->ops->init_videobuf(&icf->vb_vidq, icf->lock, icd);
+        ici->ops->init_videobuf(&icf->vb_vidq, icd);
 
         return 0;
 
         /* All errors are entered with the video_lock held */
 eiciadd:
-        lock = icf->lock;
-        icf->lock = NULL;
-        if (ici->ops->spinlock_free)
-                ici->ops->spinlock_free(lock);
-esla:
         module_put(ici->ops->owner);
 emgi:
         module_put(icd->ops->owner);
@@ -260,15 +247,11 @@ static int soc_camera_close(struct inode *inode, struct file *file)
         struct soc_camera_device *icd = icf->icd;
         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
         struct video_device *vdev = icd->vdev;
-        spinlock_t *lock = icf->lock;
 
         mutex_lock(&video_lock);
         icd->use_count--;
         if (!icd->use_count)
                 ici->ops->remove(icd);
-        icf->lock = NULL;
-        if (ici->ops->spinlock_free)
-                ici->ops->spinlock_free(lock);
         module_put(icd->ops->owner);
         module_put(ici->ops->owner);
         mutex_unlock(&video_lock);
@@ -764,21 +747,6 @@ static void dummy_release(struct device *dev)
 {
 }
 
-static spinlock_t *spinlock_alloc(struct soc_camera_file *icf)
-{
-        spinlock_t *lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
-
-        if (lock)
-                spin_lock_init(lock);
-
-        return lock;
-}
-
-static void spinlock_free(spinlock_t *lock)
-{
-        kfree(lock);
-}
-
 int soc_camera_host_register(struct soc_camera_host *ici)
 {
         int ret;
@@ -808,11 +776,6 @@ int soc_camera_host_register(struct soc_camera_host *ici)
         if (ret)
                 goto edevr;
 
-        if (!ici->ops->spinlock_alloc) {
-                ici->ops->spinlock_alloc = spinlock_alloc;
-                ici->ops->spinlock_free = spinlock_free;
-        }
-
         scan_add_host(ici);
 
         return 0;