Verify that the request state is IDLE before queueing it. Also mark
requests queued when they're queued, and return the request to IDLE if
queueing it failed.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/media/media-device.c | 55 +++++++++++++++++++++++++++++++++++++-------
1 file changed, 47 insertions(+), 8 deletions(-)
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 7781c49..247587b 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -189,6 +189,47 @@ static void media_device_request_delete(struct media_device *mdev,
media_device_request_put(req);
}
+static int media_device_request_queue_apply(
+ struct media_device *mdev, struct media_device_request *req,
+ int (*fn)(struct media_device *mdev,
+ struct media_device_request *req), bool queue)
+{
+ char *str = queue ? "queue" : "apply";
+ unsigned long flags;
+ int rval = 0;
+
+ if (!fn)
+ return -ENOSYS;
+
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ if (req->state != MEDIA_DEVICE_REQUEST_STATE_IDLE) {
+ rval = -EINVAL;
+ dev_dbg(mdev->dev,
+ "request: unable to %s %u, request in state %s\n",
+ str, req->id, request_state(req->state));
+ } else {
+ req->state = MEDIA_DEVICE_REQUEST_STATE_QUEUED;
+ }
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+
+ if (rval)
+ return rval;
+
+ rval = fn(mdev, req);
+ if (rval) {
+ spin_lock_irqsave(&mdev->req_lock, flags);
+ req->state = MEDIA_DEVICE_REQUEST_STATE_IDLE;
+ spin_unlock_irqrestore(&mdev->req_lock, flags);
+ dev_dbg(mdev->dev,
+ "request: can't %s %u\n", str, req->id);
+ } else {
+ dev_dbg(mdev->dev,
+ "request: %s %u\n", str, req->id);
+ }
+
+ return rval;
+}
+
static long media_device_request_cmd(struct media_device *mdev,
struct file *filp,
struct media_request_cmd *cmd)
@@ -216,17 +257,15 @@ static long media_device_request_cmd(struct media_device *mdev,
break;
case MEDIA_REQ_CMD_APPLY:
- if (!mdev->ops->req_apply)
- return -ENOSYS;
-
- ret = mdev->ops->req_apply(mdev, req);
+ ret = media_device_request_queue_apply(mdev, req,
+ mdev->ops->req_apply,
+ false);
break;
case MEDIA_REQ_CMD_QUEUE:
- if (!mdev->ops->req_queue)
- return -ENOSYS;
-
- ret = mdev->ops->req_queue(mdev, req);
+ ret = media_device_request_queue_apply(mdev, req,
+ mdev->ops->req_queue,
+ true);
break;
default:
--
1.9.1
--
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