[PATCH] uml: Add throttling to console driver

This patch adds support for throttling and unthrottling input when the tty
driver can't handle it.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 36df55ad64c2..cd13b91b9ff6 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -312,6 +312,32 @@ void close_chan(struct list_head *chans, int delay_free_irq)
         }
 }
 
+void deactivate_chan(struct list_head *chans, int irq)
+{
+        struct list_head *ele;
+
+        struct chan *chan;
+        list_for_each(ele, chans) {
+                chan = list_entry(ele, struct chan, list);
+
+                if(chan->enabled && chan->input)
+                        deactivate_fd(chan->fd, irq);
+        }
+}
+
+void reactivate_chan(struct list_head *chans, int irq)
+{
+        struct list_head *ele;
+        struct chan *chan;
+
+        list_for_each(ele, chans) {
+                chan = list_entry(ele, struct chan, list);
+
+                if(chan->enabled && chan->input)
+                        reactivate_fd(chan->fd, irq);
+        }
+}
+
 int write_chan(struct list_head *chans, const char *buf, int len,
                int write_irq)
 {