From: VAMSHI GAJJELA <vamshigajjela@xxxxxxxxxx>
uart_update_timeout() sets a u64 value to an unsigned int frame_time.
While it can be cast to u32 before assignment, there's a specific case
where frame_time is cast to u64. Since frame_time consistently
participates in u64 arithmetic, its data type is converted to u64 to
eliminate the need for explicit casting.
Signed-off-by: VAMSHI GAJJELA <vamshigajjela@xxxxxxxxxx>
---
v2:
- use DIV64_U64_ROUND_UP with frame_time
drivers/tty/serial/8250/8250_port.c | 2 +-
include/linux/serial_core.h | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 141627370aab..d1bf794498c4 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -1510,7 +1510,7 @@ static inline void __stop_tx(struct uart_8250_port *p)
* rather than after it is fully sent.
* Roughly estimate 1 extra bit here with / 7.
*/
- stop_delay = p->port.frame_time + DIV_ROUND_UP(p->port.frame_time, 7);
+ stop_delay = p->port.frame_time + DIV64_U64_ROUND_UP(p->port.frame_time, 7);
}
__stop_tx_rs485(p, stop_delay);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index bb6f073bc159..b128513b009a 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -558,7 +558,7 @@ struct uart_port {
bool hw_stopped; /* sw-assisted CTS flow state */
unsigned int mctrl; /* current modem ctrl settings */
- unsigned int frame_time; /* frame timing in ns */
+ unsigned long frame_time; /* frame timing in ns */
unsigned int type; /* port type */
const struct uart_ops *ops;
unsigned int custom_divisor;
@@ -764,7 +764,7 @@ unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
*/
static inline unsigned long uart_fifo_timeout(struct uart_port *port)
{
- u64 fifo_timeout = (u64)READ_ONCE(port->frame_time) * port->fifosize;
+ u64 fifo_timeout = READ_ONCE(port->frame_time) * port->fifosize;
/* Add .02 seconds of slop */
fifo_timeout += 20 * NSEC_PER_MSEC;
--
2.42.0.655.g421f12c284-goog
