linux-kernel - [PATCH] serial: uartlite: Use dynamic allocation for major number

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Date:   Thu, 9 Nov 2023 18:06:40 +0530
From:   Manikanta Guntupalli <manikanta.guntupalli@....com>
To:     <git@....com>, <michal.simek@....com>, <jacmet@...site.dk>,
        <gregkh@...uxfoundation.org>, <jirislaby@...nel.org>,
        <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <radhey.shyam.pandey@....com>, <srinivas.goud@....com>,
        <shubhrajyoti.datta@....com>, <manion05gk@...il.com>,
        Manikanta Guntupalli <manikanta.guntupalli@....com>
Subject: [PATCH] serial: uartlite: Use dynamic allocation for major number

Device number 204 has a range of minors on major number.
uart_register_driver is failing due to lack of minor numbers
when more number of uart ports used. So, use dynamic allocation
for major number to avoid minor number limitation on 204 major
number.

https://docs.kernel.org/arch/arm/sa1100/serial_uart.html

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@....com>
---
 drivers/tty/serial/uartlite.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c
index 404c14acafa5..c80ed0373b44 100644
--- a/drivers/tty/serial/uartlite.c
+++ b/drivers/tty/serial/uartlite.c
@@ -24,8 +24,8 @@
 #include <linux/pm_runtime.h>
 
 #define ULITE_NAME		"ttyUL"
-#define ULITE_MAJOR		204
-#define ULITE_MINOR		187
+#define ULITE_MAJOR		0	/* use dynamic node allocation */
+#define ULITE_MINOR		0
 #define ULITE_NR_UARTS		CONFIG_SERIAL_UARTLITE_NR_UARTS
 
 /* ---------------------------------------------------------------------
-- 
2.25.1