jolly has uploaded this change for review.

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dahdi: Disable OSMO_FD_WRITE if HDLC/RAW write queue is empty

Not doing so will cause 100% CPU usage, because the write functions are
constantly called if their queue is empty.

Change-Id: I2c544594eb187110861ab2564323654a2dc6e85a
---
M src/input/dahdi.c
1 file changed, 18 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-abis refs/changes/34/34034/1

diff --git a/src/input/dahdi.c b/src/input/dahdi.c
index acf1f94..b4e6657 100644
--- a/src/input/dahdi.c
+++ b/src/input/dahdi.c
@@ -277,8 +277,10 @@
 
 	/* get the next msg for this timeslot */
 	msg = e1inp_tx_ts(e1i_ts, NULL);
-	if (!msg)
+	if (!msg) {
+		osmo_fd_write_disable(bfd);
 		return;
+	}
 
 	if (msgb_tailroom(msg) >= 2) {
 		/* two bytes of space for the FCS added by DAHDI in the kernel */
@@ -402,8 +404,10 @@
 
 	/* get the next msg for this timeslot */
 	msg = e1inp_tx_ts(e1i_ts, NULL);
-	if (!msg)
+	if (!msg) {
+		osmo_fd_write_disable(bfd);
 		return 0;
+	}
 
 	if (msg->len != D_BCHAN_TX_GRAN) {
 		/* This might lead to a transmit underrun, as we call tx

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