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| author |   Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-12-04 18:42:19 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2011-12-09 19:14:12 -0800 |
| commit | 0690f41fddd285c3473e4af2a42d15bce7ff3e68 (patch) | |
| tree | 2df38f436c0d05bce5183f53468aa523b1ece913 | |
| parent | serial: move struct uart_8250_port from 8250.c to 8250.h (diff) | |
| download | wireguard-linux-0690f41fddd285c3473e4af2a42d15bce7ff3e68.tar.xz wireguard-linux-0690f41fddd285c3473e4af2a42d15bce7ff3e68.zip | |
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>
| -rw-r--r-- | drivers/tty/serial/8250.c | 17 |
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); |