[Xen-changelog] Avoid ns16550 poll timeout underflow.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 106f258edf97d35c11f80717f40cac482583ddf6
# Parent  43a1f899e302b813616b2467380537fecc92a3a7
Avoid ns16550 poll timeout underflow.

Signed-off-by: Alex Williamson <alex.williamson@xxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 43a1f899e302 -r 106f258edf97 xen/drivers/char/ns16550.c
--- a/xen/drivers/char/ns16550.c        Fri Dec  2 08:54:09 2005
+++ b/xen/drivers/char/ns16550.c        Fri Dec  2 10:05:49 2005
@@ -211,7 +211,8 @@
     {
         /* Polled mode. Calculate time to fill RX FIFO and/or empty TX FIFO. */
         bits = uart->data_bits + uart->stop_bits + !!uart->parity;
-        uart->timeout_ms = (bits * port->tx_fifo_size * 1000) / uart->baud;
+        uart->timeout_ms = max_t(
+            unsigned int, 1, (bits * port->tx_fifo_size * 1000) / uart->baud);
         init_ac_timer(&uart->timer, ns16550_poll, port, 0);
         set_ac_timer(&uart->timer, NOW() + MILLISECS(uart->timeout_ms));
     }

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