[PATCH 13/13] rpmsg: ctrl: add support of the endpoints release

[Arnaud Pouliquen]

Add the support of the release of an endpoint using the ioctl
interface.
The endpoint is identified using its name, its source address
and is destination address.
To support legacy a new ioctl ioctl is created instead of updating
RPMSG_DESTROY_EPT_IOCTL.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliq...@st.com>
---
 drivers/rpmsg/rpmsg_ctrl.c | 35 ++++++++++++++++++++++++-----------
 include/uapi/linux/rpmsg.h |  1 +
 2 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c
index d2a6dbb8798f..d696247970c2 100644
--- a/drivers/rpmsg/rpmsg_ctrl.c
+++ b/drivers/rpmsg/rpmsg_ctrl.c
@@ -75,26 +75,39 @@ static long rpmsg_ctrl_dev_ioctl(struct file *fp, unsigned 
int cmd,
        struct rpmsg_channel_info chinfo;
        struct rpmsg_endpoint_info eptinfo;
        struct rpmsg_device *newch;
-
-       if (cmd != RPMSG_CREATE_EPT_IOCTL)
-               return -EINVAL;
+       int ret;
 
        if (copy_from_user(&eptinfo, argp, sizeof(eptinfo)))
                return -EFAULT;
 
-       chinfo.driver_override = rpmsg_ctrl_get_drv_name(eptinfo.service);
-       if (!chinfo.driver_override)
-               return -ENODEV;
-
        memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE);
        chinfo.name[RPMSG_NAME_SIZE - 1] = '\0';
        chinfo.src = eptinfo.src;
        chinfo.dst = eptinfo.dst;
 
-       newch = rpmsg_create_channel(ctrldev->rpdev, &chinfo);
-       if (!newch) {
-               dev_err(&ctrldev->dev, "rpmsg_create_channel failed\n");
-               return -ENXIO;
+       switch (cmd) {
+       case RPMSG_CREATE_EPT_IOCTL:
+               chinfo.driver_override =
+                               rpmsg_ctrl_get_drv_name(eptinfo.service);
+               if (!chinfo.driver_override)
+                       return -ENODEV;
+
+               newch = rpmsg_create_channel(ctrldev->rpdev, &chinfo);
+               if (!newch) {
+                       dev_err(&ctrldev->dev, "rpmsg_create_channel failed\n");
+                       return -ENXIO;
+               }
+               break;
+       case RPMSG_RELEASE_EPT_IOCTL:
+               ret = rpmsg_release_channel(ctrldev->rpdev, &chinfo);
+               if (ret) {
+                       dev_err(&ctrldev->dev,
+                               "rpmsg_release_channel failed: %d\n", ret);
+                       return ret;
+               }
+               break;
+       default:
+               return -EINVAL;
        }
 
        return 0;
diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h
index 2ccc10ffacd4..74d821ee5f8c 100644
--- a/include/uapi/linux/rpmsg.h
+++ b/include/uapi/linux/rpmsg.h
@@ -39,5 +39,6 @@ struct rpmsg_endpoint_info {
 
 #define RPMSG_CREATE_EPT_IOCTL _IOW(0xb5, 0x1, struct rpmsg_endpoint_info)
 #define RPMSG_DESTROY_EPT_IOCTL        _IO(0xb5, 0x2)
+#define RPMSG_RELEASE_EPT_IOCTL        _IOW(0xb5, 0x3, struct 
rpmsg_endpoint_info)
 
 #endif
-- 
2.17.1