[PATCH 1/2] serial: samsung: Remove NULL checking for baud clock
From: Kyoungil Kim <hidden>
Date: 2012-05-20 08:45:54
Also in:
linux-samsung-soc, linux-serial
Subsystem:
arm/samsung s3c, s5p and exynos arm architectures, the rest, tty layer and serial drivers · Maintainers:
Krzysztof Kozlowski, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
Signed-off-by: Kyoungil Kim <redacted> --- drivers/tty/serial/samsung.c | 21 ++++++++++++--------- 1 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index d8b0aee..5668538 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c@@ -529,7 +529,7 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, switch (level) { case 3: - if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) + if (!IS_ERR(ourport->baudclk)) clk_disable(ourport->baudclk); clk_disable(ourport->clk);
@@ -538,7 +538,7 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level, case 0: clk_enable(ourport->clk); - if (!IS_ERR(ourport->baudclk) && ourport->baudclk != NULL) + if (!IS_ERR(ourport->baudclk)) clk_enable(ourport->baudclk); break;
@@ -604,7 +604,6 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport, char clkname[MAX_CLK_NAME_LENGTH]; int calc_deviation, deviation = (1 << 30) - 1; - *best_clk = NULL; clk_sel = (ourport->cfg->clk_sel) ? ourport->cfg->clk_sel : ourport->info->def_clk_sel; for (cnt = 0; cnt < info->num_clks; cnt++) {
@@ -613,7 +612,7 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport, sprintf(clkname, "clk_uart_baud%d", cnt); clk = clk_get(ourport->port.dev, clkname); - if (IS_ERR_OR_NULL(clk)) + if (IS_ERR(clk)) continue; rate = clk_get_rate(clk);
@@ -684,7 +683,7 @@ static void s3c24xx_serial_set_termios(struct uart_port *port, { struct s3c2410_uartcfg *cfg = s3c24xx_port_to_cfg(port); struct s3c24xx_uart_port *ourport = to_ourport(port); - struct clk *clk = NULL; + struct clk *clk = ERR_PTR(-EINVAL); unsigned long flags; unsigned int baud, quot, clk_sel = 0; unsigned int ulcon;
@@ -705,7 +704,7 @@ static void s3c24xx_serial_set_termios(struct uart_port *port, quot = s3c24xx_serial_getclk(ourport, baud, &clk, &clk_sel); if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) quot = port->custom_divisor; - if (!clk) + if (IS_ERR(clk)) return; /* check to see if we need to change clock source */
@@ -713,9 +712,9 @@ static void s3c24xx_serial_set_termios(struct uart_port *port, if (ourport->baudclk != clk) { s3c24xx_serial_setsource(port, clk_sel); - if (ourport->baudclk != NULL && !IS_ERR(ourport->baudclk)) { + if (!IS_ERR(ourport->baudclk)) { clk_disable(ourport->baudclk); - ourport->baudclk = NULL; + ourport->baudclk = ERR_PTR(-EINVAL); } clk_enable(clk);
@@ -1160,6 +1159,9 @@ static ssize_t s3c24xx_serial_show_clksrc(struct device *dev, struct uart_port *port = s3c24xx_dev_to_port(dev); struct s3c24xx_uart_port *ourport = to_ourport(port); + if (IS_ERR(ourport->baudclk)) + return -EINVAL; + return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->baudclk->name); }
@@ -1200,6 +1202,7 @@ static int s3c24xx_serial_probe(struct platform_device *pdev) return -ENODEV; } + ourport->baudclk = ERR_PTR(-EINVAL); ourport->info = ourport->drv_data->info; ourport->cfg = (pdev->dev.platform_data) ? (struct s3c2410_uartcfg *)pdev->dev.platform_data :
@@ -1387,7 +1390,7 @@ s3c24xx_serial_get_options(struct uart_port *port, int *baud, sprintf(clk_name, "clk_uart_baud%d", clk_sel); clk = clk_get(port->dev, clk_name); - if (!IS_ERR(clk) && clk != NULL) + if (!IS_ERR(clk)) rate = clk_get_rate(clk); else rate = 1;
--
1.7.1