[Xen-devel] [PATCH 14/25 v7] xen/arm: vpl011: Add a new maybe_add_console_tty_fd function in xenconsole

[Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>]

This patch introduces a new maybe_add_console_tty_fd function. This function
adds the tty fd to the list of polled fds.

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Julien Grall <julien.grall@xxxxxxx>

Changes since v6:
- Renamed add_console_tty_fd to maybe_add_console_tty_fd since it 
  adds the tty FD to the poll list conditionally.
- I have retained the reviewed-by tag as only the function name has been
  changed.

Changes since v5:
- Split this change in a separate patch.

 tools/console/daemon/io.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/tools/console/daemon/io.c b/tools/console/daemon/io.c
index 3483252..a0b35da 100644
--- a/tools/console/daemon/io.c
+++ b/tools/console/daemon/io.c
@@ -1067,6 +1067,22 @@ static void maybe_add_console_evtchn_fd(struct console 
*con, void *data)
        *((long long *)data) = next_timeout;
 }
 
+static void maybe_add_console_tty_fd(struct console *con)
+{
+       if (con->master_fd != -1) {
+               short events = 0;
+               if (!con->d->is_dead && ring_free_bytes(con))
+                       events |= POLLIN;
+
+               if (!buffer_empty(&con->buffer))
+                       events |= POLLOUT;
+
+               if (events)
+                       con->master_pollfd_idx =
+                               set_fds(con->master_fd, events|POLLPRI);
+       }
+}
+
 void handle_io(void)
 {
        int ret;
@@ -1146,19 +1162,7 @@ void handle_io(void)
 
                        maybe_add_console_evtchn_fd(con, (void *)&next_timeout);
 
-                       if (con->master_fd != -1) {
-                               short events = 0;
-                               if (!d->is_dead && ring_free_bytes(con))
-                                       events |= POLLIN;
-
-                               if (!buffer_empty(&con->buffer))
-                                       events |= POLLOUT;
-
-                               if (events)
-                                       con->master_pollfd_idx =
-                                               set_fds(con->master_fd,
-                                                       events|POLLPRI);
-                       }
+                       maybe_add_console_tty_fd(con);
                }
 
                /* If any domain has been rate limited, we need to work
-- 
2.7.4


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