serial: clean up parameter passing for 8250 Rx IRQ handling

The receive_chars() was taking a pointer to a passed in LSR value
in status and knocking off bits as it processed them.  But since
receive_chars isn't returning a value, we can instead pass in
a normal non-pointer value for LSR, and simply return the
residual (unprocessed) LSR once it is done.

The value in this cleanup, is that it clarifies the API of the
receive_chars prior to exporting it to other 8250-like drivers
for shared usage.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index c58e9e286bff..5274228fa03c 100644
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -1375,11 +1375,16 @@ static void clear_rx_fifo(struct uart_8250_port *up)
         } while (1);
 }
 
-static void
-receive_chars(struct uart_8250_port *up, unsigned int *status)
+/*
+ * receive_chars: processes according to the passed in LSR
+ * value, and returns the remaining LSR bits not handled
+ * by this Rx routine.
+ */
+static unsigned char
+receive_chars(struct uart_8250_port *up, unsigned char lsr)
 {
         struct tty_struct *tty = up->port.state->port.tty;
-        unsigned char ch, lsr = *status;
+        unsigned char ch;
         int max_count = 256;
         char flag;
 
@@ -1455,7 +1460,7 @@ ignore_char:
         spin_unlock(&up->port.lock);
         tty_flip_buffer_push(tty);
         spin_lock(&up->port.lock);
-        *status = lsr;
+        return lsr;
 }
 
 static void transmit_chars(struct uart_8250_port *up)
@@ -1524,7 +1529,7 @@ static unsigned int check_modem_status(struct uart_8250_port *up)
  */
 static void serial8250_handle_port(struct uart_8250_port *up)
 {
-        unsigned int status;
+        unsigned char status;
         unsigned long flags;
 
         spin_lock_irqsave(&up->port.lock, flags);
@@ -1534,7 +1539,7 @@ static void serial8250_handle_port(struct uart_8250_port *up)
         DEBUG_INTR("status = %x...", status);
 
         if (status & (UART_LSR_DR | UART_LSR_BI))
-                receive_chars(up, &status);
+                status = receive_chars(up, status);
         check_modem_status(up);
         if (status & UART_LSR_THRE)
                 transmit_chars(up);