On Tue, 2 Feb 2016, Vladimir Murzin wrote:
> +static int __init mps2_clockevent_init(struct device_node *np)
> +{
> + void __iomem *base;
> + struct clk *clk;
> + struct clockevent_mps2 *ce;
> + u32 rate;
> + int irq, ret;
> + const char *name = "mps2-clkevt";
> +
> + ret = of_property_read_u32(np, "clock-frequency", &rate);
> + if (ret) {
> + clk = of_clk_get(np, 0);
> + if (IS_ERR(clk)) {
> + ret = PTR_ERR(clk);
> + pr_err("failed to get clock for clockevent: %d\n", ret);
> + goto err_clk_get;
> + }
> +
> + ret = clk_prepare_enable(clk);
> + if (ret) {
> + pr_err("failed to enable clock for clockevent: %d\n", ret);
> + clk_put(clk);
> + goto err_clk_enable;
> + }
> +
> + rate = clk_get_rate(clk);
> + }
So in case that "clock-frequency" is available in DT, what enables and
configures the clock?
> +err_ia_alloc:
> + kfree(ce);
> +err_ce_alloc:
> +err_get_irq:
> + iounmap(base);
> +err_iomap:
> + clk_disable_unprepare(clk);
clk is not initialized when "clock-frequency" is available in DT. The compiler
should have told you ....
> +err_clk_enable:
> + clk_put(clk);
Put without get ....
> +static int __init mps2_clocksource_init(struct device_node *np)
> +{
> + void __iomem *base;
> + struct clk *clk;
> + u32 rate;
> + int ret;
> + const char *name = "mps2-clksrc";
> +
> + ret = of_property_read_u32(np, "clock-frequency", &rate);
> + if (ret) {
> + clk = of_clk_get(np, 0);
> + if (IS_ERR(clk)) {
> + ret = PTR_ERR(clk);
> + pr_err("failed to get clock for clocksource: %d\n", ret);
> + goto err_clk_get;
> + }
> +
> + ret = clk_prepare_enable(clk);
> + if (ret) {
> + pr_err("failed to enable clock for clocksource: %d\n", ret);
> + clk_put(clk);
> + goto err_clk_enable;
> + }
> +
> + rate = clk_get_rate(clk);
> + }
Same problem as above.
> +err_clocksource_init:
> + iounmap(base);
> +err_iomap:
> + clk_disable_unprepare(clk);
Ditto.
> +err_clk_enable:
> + clk_put(clk);
Ditto.
> +err_clk_get:
> + return ret;
> +}
> +
> +static void __init mps2_timer_init(struct device_node *np)
> +{
> + static int has_clocksource, has_clockevent;
> + int ret;
> +
> + if (!has_clocksource) {
> + ret = mps2_clocksource_init(np);
> + if (!ret) {
> + has_clocksource = 1;
> + return;
> + }
> + }
> +
> + if (!has_clockevent) {
> + ret = mps2_clockevent_init(np);
> + if (!ret) {
> + has_clockevent = 1;
> + return;
> + }
> + }
You take randomly the first timer as clocksource and the second one as
clockevent. If clocksource init fails, you try to install it as clockevent.
Sorry, but I really cannot follow the logic here.
Thanks,
tglx
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