hvc_console: Improve tty/console put_chars handling

Currently, the hvc_console_print() function drops console output if the
hvc backend's put_chars() returns 0.  This patch changes this behavior
to allow a retry through returning -EAGAIN.

This change also affects the hvc_push() function.  Both functions are
changed to handle -EAGAIN and to retry the put_chars() operation.

If a hvc backend returns -EAGAIN, the retry handling differs:

  - hvc_console_print() spins to write the complete console output.
  - hvc_push() behaves the same way as for returning 0.

Now hvc backends can indirectly control the way how console output is
handled through the hvc console layer.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Acked-by: Anton Blanchard <anton@samba.org>
Cc: <stable@kernel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index f8ff6f50fc35..59000750cc73 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -163,8 +163,10 @@ static void hvc_console_print(struct console *co, const char *b,
                 } else {
                         r = cons_ops[index]->put_chars(vtermnos[index], c, i);
                         if (r <= 0) {
-                                /* throw away chars on error */
-                                i = 0;
+                                /* throw away characters on error
+                                 * but spin in case of -EAGAIN */
+                                if (r != -EAGAIN)
+                                        i = 0;
                         } else if (r > 0) {
                                 i -= r;
                                 if (i > 0)
@@ -448,7 +450,7 @@ static int hvc_push(struct hvc_struct *hp)
 
         n = hp->ops->put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf);
         if (n <= 0) {
-                if (n == 0) {
+                if (n == 0 || n == -EAGAIN) {
                         hp->do_wakeup = 1;
                         return 0;
                 }