[media] siano: don't request statistics too fast

As each DVBv3 call may generate an stats overhead, prevent doing
it too fast. This is specially useful if a burst of get stats
DVBv3 call is sent.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/drivers/media/common/siano/smsdvb-main.c b/drivers/media/common/siano/smsdvb-main.c
index c14f10d5d6c0..4242005082ed 100644
--- a/drivers/media/common/siano/smsdvb-main.c
+++ b/drivers/media/common/siano/smsdvb-main.c
@@ -663,6 +663,11 @@ static int smsdvb_send_statistics_request(struct smsdvb_client_t *client)
         int rc;
         struct SmsMsgHdr_ST Msg;
 
+        /* Don't request stats too fast */
+        if (client->get_stats_jiffies &&
+           (!time_after(jiffies, client->get_stats_jiffies)))
+                return 0;
+        client->get_stats_jiffies = jiffies + msecs_to_jiffies(100);
 
         Msg.msgSrcId = DVBT_BDA_CONTROL_MSG_ID;
         Msg.msgDstId = HIF_TASK;
diff --git a/drivers/media/common/siano/smsdvb.h b/drivers/media/common/siano/smsdvb.h
index 09982bcf2535..34220696d87d 100644
--- a/drivers/media/common/siano/smsdvb.h
+++ b/drivers/media/common/siano/smsdvb.h
@@ -52,6 +52,8 @@ struct smsdvb_client_t {
         int event_fe_state;
         int event_unc_state;
 
+        unsigned long           get_stats_jiffies;
+
         /* Stats debugfs data */
         struct dentry           *debugfs;