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serial: 8250_dw: Use devm_add_action_or_reset() 

Slightly simplify ->probe() and drop a few goto labels by using
devm_add_action_or_reset() for clock and reset cleanup.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220509172129.37770-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2022-05-09 20:21:28 +03:00 committed by Greg Kroah-Hartman
parent 4088ca3edc
commit 295b09128d
1 changed files with 31 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
drivers/tty/serial/8250/8250_dw.c
View File

@ -484,6 +484,16 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
}
}
static void dw8250_clk_disable_unprepare(void *data)
{
clk_disable_unprepare(data);
}
static void dw8250_reset_control_assert(void *data)
{
reset_control_assert(data);
}
static int dw8250_probe(struct platform_device *pdev)
{
struct uart_8250_port uart = {}, *up = &uart;
@ -585,35 +595,43 @@ static int dw8250_probe(struct platform_device *pdev)
if (err)
dev_warn(dev, "could not enable optional baudclk: %d\n", err);
err = devm_add_action_or_reset(dev, dw8250_clk_disable_unprepare, data->clk);
if (err)
return err;
if (data->clk)
p->uartclk = clk_get_rate(data->clk);
/* If no clock rate is defined, fail. */
if (!p->uartclk) {
dev_err(dev, "clock rate not defined\n");
err = -EINVAL;
goto err_clk;
return -EINVAL;
}
data->pclk = devm_clk_get_optional(dev, "apb_pclk");
if (IS_ERR(data->pclk)) {
err = PTR_ERR(data->pclk);
goto err_clk;
}
if (IS_ERR(data->pclk))
return PTR_ERR(data->pclk);
err = clk_prepare_enable(data->pclk);
if (err) {
dev_err(dev, "could not enable apb_pclk\n");
goto err_clk;
return err;
}
err = devm_add_action_or_reset(dev, dw8250_clk_disable_unprepare, data->pclk);
if (err)
return err;
data->rst = devm_reset_control_get_optional_exclusive(dev, NULL);
if (IS_ERR(data->rst)) {
err = PTR_ERR(data->rst);
goto err_pclk;
}
if (IS_ERR(data->rst))
return PTR_ERR(data->rst);
reset_control_deassert(data->rst);
err = devm_add_action_or_reset(dev, dw8250_reset_control_assert, data->rst);
if (err)
return err;
dw8250_quirks(p, data);
/* If the Busy Functionality is not implemented, don't handle it */
@ -631,10 +649,8 @@ static int dw8250_probe(struct platform_device *pdev)
}
data->data.line = serial8250_register_8250_port(up);
if (data->data.line < 0) {
err = data->data.line;
goto err_reset;
}
if (data->data.line < 0)
return data->data.line;
/*
* Some platforms may provide a reference clock shared between several
@ -655,17 +671,6 @@ static int dw8250_probe(struct platform_device *pdev)
pm_runtime_enable(dev);
return 0;
err_reset:
reset_control_assert(data->rst);
err_pclk:
clk_disable_unprepare(data->pclk);
err_clk:
clk_disable_unprepare(data->clk);
return err;
}
static int dw8250_remove(struct platform_device *pdev)
@ -683,12 +688,6 @@ static int dw8250_remove(struct platform_device *pdev)
serial8250_unregister_port(data->data.line);
reset_control_assert(data->rst);
clk_disable_unprepare(data->pclk);
clk_disable_unprepare(data->clk);
pm_runtime_disable(dev);
pm_runtime_put_noidle(dev);