firmware: arm_scmi: Make .clear_channel optional

Make transport operation .clear_channel optional since some transports
do not need it and so avoid to have them implement dummy callbacks.

Link: https://lore.kernel.org/r/20210803131024.40280-7-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index bfc35d7..6c77fcc 100644 (file)
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -600,6 +600,13 @@ static inline void scmi_xfer_command_release(struct scmi_info *info,
        __scmi_xfer_put(&info->tx_minfo, xfer);
 }
 
+static inline void scmi_clear_channel(struct scmi_info *info,
+                                     struct scmi_chan_info *cinfo)
+{
+       if (info->desc->ops->clear_channel)
+               info->desc->ops->clear_channel(cinfo);
+}
+
 static void scmi_handle_notification(struct scmi_chan_info *cinfo, u32 msg_hdr)
 {
        struct scmi_xfer *xfer;
@@ -613,7 +620,7 @@ static void scmi_handle_notification(struct scmi_chan_info *cinfo, u32 msg_hdr)
        if (IS_ERR(xfer)) {
                dev_err(dev, "failed to get free message slot (%ld)\n",
                        PTR_ERR(xfer));
-               info->desc->ops->clear_channel(cinfo);
+               scmi_clear_channel(info, cinfo);
                return;
        }
 
@@ -629,7 +636,7 @@ static void scmi_handle_notification(struct scmi_chan_info *cinfo, u32 msg_hdr)
 
        __scmi_xfer_put(minfo, xfer);
 
-       info->desc->ops->clear_channel(cinfo);
+       scmi_clear_channel(info, cinfo);
 }
 
 static void scmi_handle_response(struct scmi_chan_info *cinfo, u32 msg_hdr)
@@ -639,7 +646,7 @@ static void scmi_handle_response(struct scmi_chan_info *cinfo, u32 msg_hdr)
 
        xfer = scmi_xfer_command_acquire(cinfo, msg_hdr);
        if (IS_ERR(xfer)) {
-               info->desc->ops->clear_channel(cinfo);
+               scmi_clear_channel(info, cinfo);
                return;
        }
 
@@ -654,7 +661,7 @@ static void scmi_handle_response(struct scmi_chan_info *cinfo, u32 msg_hdr)
                           xfer->hdr.type);
 
        if (xfer->hdr.type == MSG_TYPE_DELAYED_RESP) {
-               info->desc->ops->clear_channel(cinfo);
+               scmi_clear_channel(info, cinfo);
                complete(xfer->async_done);
        } else {
                complete(&xfer->done);