From: Manikanta Guntupalli Date: Thu, 16 Nov 2023 13:40:03 +0000 (+0530) Subject: serial: uartlite: Use dynamic allocation for major number when uart ports > 4 X-Git-Tag: v6.8-rc1~59^2~123 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=01c33b813864ca15a9dec22045ce1a5bb09d5e74;p=thirdparty%2Fkernel%2Flinux.git serial: uartlite: Use dynamic allocation for major number when uart ports > 4 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, to avoid minor number limitation on 204 major number use dynamic major allocation when more than 4 uart ports used otherwise use static major allocation. https://docs.kernel.org/arch/arm/sa1100/serial_uart.html Signed-off-by: Manikanta Guntupalli Link: https://lore.kernel.org/r/20231116134003.3762725-3-manikanta.guntupalli@amd.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 732c893c8d161..8b1f5756002f8 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -532,6 +532,9 @@ config SERIAL_UARTLITE_NR_UARTS help Set this to the number of uartlites in your system, or the number you think you might implement. + If maximum number of uartlite serial ports is more than 4, then the + driver uses dynamic allocation instead of static allocation for major + number. config SERIAL_SUNCORE bool diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c index f9c69f543a26c..10ba41b7be994 100644 --- a/drivers/tty/serial/uartlite.c +++ b/drivers/tty/serial/uartlite.c @@ -24,8 +24,13 @@ #include #define ULITE_NAME "ttyUL" +#if CONFIG_SERIAL_UARTLITE_NR_UARTS > 4 +#define ULITE_MAJOR 0 /* use dynamic node allocation */ +#define ULITE_MINOR 0 +#else #define ULITE_MAJOR 204 #define ULITE_MINOR 187 +#endif #define ULITE_NR_UARTS CONFIG_SERIAL_UARTLITE_NR_UARTS /* ---------------------------------------------------------------------