serial: avoid stalling suspend if serial port won't drain

Some ports seem to be unable to drain their transmitters on shut down.  Such a
problem can occur if the port is programmed for hardware imposed flow control,
characters are in the FIFO but the CTS signal is inactive.

Normally, this isn't a problem because most places where we wait for the
transmitter to drain have a time-out.  However, there is no timeout in the
suspend path.

Give a port 30ms to drain; this is an arbitary value chosen to avoid long
delays if there are many such ports in the system, while giving a reasonable
chance for a single port to drain.  Should a port not drain within this
timeout, issue a warning.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 2554d2fa6542..304fe32eb066 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -1977,6 +1977,7 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *port)
 
         if (state->info && state->info->flags & UIF_INITIALIZED) {
                 const struct uart_ops *ops = port->ops;
+                int tries;
 
                 state->info->flags = (state->info->flags & ~UIF_INITIALIZED)
                                      | UIF_SUSPENDED;
@@ -1990,9 +1991,14 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *port)
                 /*
                  * Wait for the transmitter to empty.
                  */
-                while (!ops->tx_empty(port)) {
+                for (tries = 3; !ops->tx_empty(port) && tries; tries--) {
                         msleep(10);
                 }
+                if (!tries)
+                        printk(KERN_ERR "%s%s%s%d: Unable to drain transmitter\n",
+                               port->dev ? port->dev->bus_id : "",
+                               port->dev ? ": " : "",
+                               drv->dev_name, port->line);
 
                 ops->shutdown(port);
         }