From bb7f09ba961dd43a2398975cc2d4ad0eb77ec865 Mon Sep 17 00:00:00 2001 From: Doug Anderson Date: Mon, 21 Apr 2014 09:40:34 -0700 Subject: [PATCH] serial: samsung: Use the passed in "port", fixing kgdb w/ no console The two functions in the samsung serial driver used for writing characters out to the port were inconsistent about whether they used the passed in "port" or the global "cons_uart". There was no reason to use the global and the use of the global in s3c24xx_serial_put_poll_char() caused a crash in the case where you used the serial port for kgdboc but not for console. Fix it so we used the passed in variable. Note that this doesn't fix all problems with the samsung serial driver. Specifically: * s3c24xx_serial_console_putchar() is still 99% identical to s3c24xx_serial_put_poll_char() (the function signature is different, but that's about it). A future patch will make them slightly less identical and judging by other serial drivers we may need yet more differences eventually. * The samsung serial driver still doesn't allow you to have more than one console port since it still uses the global cons_uart in s3c24xx_serial_console_write(). Signed-off-by: Doug Anderson Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 23f459600738..a8e8b796f4f7 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1446,8 +1446,8 @@ static int s3c24xx_serial_get_poll_char(struct uart_port *port) static void s3c24xx_serial_put_poll_char(struct uart_port *port, unsigned char c) { - unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON); - unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON); + unsigned int ufcon = rd_regl(port, S3C2410_UFCON); + unsigned int ucon = rd_regl(port, S3C2410_UCON); /* not possible to xmit on unconfigured port */ if (!s3c24xx_port_configured(ucon)) @@ -1455,7 +1455,7 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port, while (!s3c24xx_serial_console_txrdy(port, ufcon)) cpu_relax(); - wr_regb(cons_uart, S3C2410_UTXH, c); + wr_regb(port, S3C2410_UTXH, c); } #endif /* CONFIG_CONSOLE_POLL */ @@ -1463,8 +1463,8 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port, static void s3c24xx_serial_console_putchar(struct uart_port *port, int ch) { - unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON); - unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON); + unsigned int ufcon = rd_regl(port, S3C2410_UFCON); + unsigned int ucon = rd_regl(port, S3C2410_UCON); /* not possible to xmit on unconfigured port */ if (!s3c24xx_port_configured(ucon)) @@ -1472,7 +1472,7 @@ s3c24xx_serial_console_putchar(struct uart_port *port, int ch) while (!s3c24xx_serial_console_txrdy(port, ufcon)) barrier(); - wr_regb(cons_uart, S3C2410_UTXH, ch); + wr_regb(port, S3C2410_UTXH, ch); } static void -- 2.20.1