[SERIAL] Convert fifosize to an unsigned int

Some UARTs have more than 255 bytes of FIFO, which can't be
represented by an unsigned char.  Change the kernel's internal
structure to be an unsigned int, but still export an unsigned char
via the TIOCGSERIAL ioctl.  If the TIOCSSERIAL ioctl provides a
fifo size of 0, assume this means "don't change" otherwise we'll
corrupt the larger fifo sizes.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index bd14858121ea..966e2e8a1740 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -214,10 +214,11 @@ struct uart_port {
         unsigned char __iomem   *membase;               /* read/write[bwl] */
         unsigned int            irq;                    /* irq number */
         unsigned int            uartclk;                /* base uart clock */
-        unsigned char           fifosize;               /* tx fifo size */
+        unsigned int            fifosize;               /* tx fifo size */
         unsigned char           x_char;                 /* xon/xoff char */
         unsigned char           regshift;               /* reg offset shift */
         unsigned char           iotype;                 /* io access style */
+        unsigned char           unused1;
 
 #define UPIO_PORT               (0)
 #define UPIO_HUB6               (1)