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Date:   Wed, 25 Oct 2023 19:56:09 +0530
From:   Vamshi Gajjela <>
To:     Greg Kroah-Hartman <>,
        Jiri Slaby <>,
Cc:,,, Subhash Jadavani <>,
        Channa Kadabi <>,
Subject: [PATCH v2 3/3] serial: core: Update uart_poll_timeout() function to
 return unsigned long


The function uart_fifo_timeout() returns an unsigned long value, which is
the number of jiffies. Therefore, the function uart_poll_timeout() has been
modified to use an unsigned long type for timeout values instead of an int
and to avoid truncation.
The return type of the function uart_poll_timeout() has also been changed
from int to unsigned long to be consistent with the type of timeout values.

Signed-off-by: VAMSHI GAJJELA <>
- unsigned long instead of unsigned int
- added () after function name in short log
- updated description
 include/linux/serial_core.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index bb6f073bc159..6916a1d7e477 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -773,9 +773,9 @@ static inline unsigned long uart_fifo_timeout(struct uart_port *port)
 /* Base timer interval for polling */
-static inline int uart_poll_timeout(struct uart_port *port)
+static inline unsigned long uart_poll_timeout(struct uart_port *port)
-	int timeout = uart_fifo_timeout(port);
+	unsigned long timeout = uart_fifo_timeout(port);
 	return timeout > 6 ? (timeout / 2 - 2) : 1;

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