linux-kernel - [PATCH v5 2/2] serial: core: Clean up uart_update

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Date:   Mon, 30 Oct 2023 13:05:42 +0530
From:   Vamshi Gajjela <vamshigajjela@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        ilpo.jarvinen@...ux.intel.com
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        manugautam@...gle.com, Subhash Jadavani <sjadavani@...gle.com>,
        Channa Kadabi <kadabi@...gle.com>,
        Vamshi Gajjela <vamshigajjela@...gle.com>
Subject: [PATCH v5 2/2] serial: core: Clean up uart_update_timeout() function

Rename the variable size to temp and change its data type from
unsigned int to u64 to avoid type casting in multiplication. Remove the
intermediate variable frame_time and use temp instead to accommodate
the nanoseconds. port->frame_time is an unsigned int, therefore an
explicit cast is used to improve readability.

Signed-off-by: Vamshi Gajjela <vamshigajjela@...gle.com>
---
v5:
- shortlog changed from "serial: core: Make local variable size to
  u64" to "Clean up uart_update_timeout() function"
- renamed local variable size to temp, generic name
- removed intermediate variable frame_time
- added typecast "unsigned int" while assigning to port->frame_time
v4:
- no change, not submitted with series
v3:
- no change, not submitted with series
v2:
- no change, not submitted with series

 drivers/tty/serial/serial_core.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 7bdc21d5e13b..21d345a9812a 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -410,11 +410,10 @@ void
 uart_update_timeout(struct uart_port *port, unsigned int cflag,
 		    unsigned int baud)
 {
-	unsigned int size = tty_get_frame_size(cflag);
-	u64 frame_time;
+	u64 temp = tty_get_frame_size(cflag);
 
-	frame_time = (u64)size * NSEC_PER_SEC;
-	port->frame_time = DIV64_U64_ROUND_UP(frame_time, baud);
+	temp *= NSEC_PER_SEC;
+	port->frame_time = (unsigned int)DIV64_U64_ROUND_UP(temp, baud);
 }
 EXPORT_SYMBOL(uart_update_timeout);
 
-- 
2.42.0.820.g83a721a137-goog