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clocksource: tcb_clksrc: Improve driver robustness 

Check function return values to avoid false positive driver init.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Boris BREZILLON 2013-10-02 14:35:41 +02:00 committed by Daniel Lezcano
parent 0e746ec558
commit 5b3c11da14
1 changed files with 28 additions and 5 deletions
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33
drivers/clocksource/tcb_clksrc.c
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@ -184,11 +184,18 @@ static struct irqaction tc_irqaction = {
.handler = ch2_irq,
};
static void __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
{
int ret;
struct clk *t2_clk = tc->clk[2];
int irq = tc->irq[2];
/* try to enable t2 clk to avoid future errors in mode change */
ret = clk_prepare_enable(t2_clk);
if (ret)
return ret;
clk_disable_unprepare(t2_clk);
clkevt.regs = tc->regs;
clkevt.clk = t2_clk;
tc_irqaction.dev_id = &clkevt;
@ -197,16 +204,21 @@ static void __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
clkevt.clkevt.cpumask = cpumask_of(0);
ret = setup_irq(irq, &tc_irqaction);
if (ret)
return ret;
clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff);
setup_irq(irq, &tc_irqaction);
return ret;
}
#else /* !CONFIG_GENERIC_CLOCKEVENTS */
static void __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
{
/* NOTHING */
return 0;
}
#endif
@ -328,13 +340,24 @@ static int __init tcb_clksrc_init(void)
}
/* and away we go! */
clocksource_register_hz(&clksrc, divided_rate);
ret = clocksource_register_hz(&clksrc, divided_rate);
if (ret)
goto err_disable_t1;
/* channel 2: periodic and oneshot timer support */
setup_clkevents(tc, clk32k_divisor_idx);
ret = setup_clkevents(tc, clk32k_divisor_idx);
if (ret)
goto err_unregister_clksrc;
return 0;
err_unregister_clksrc:
clocksource_unregister(&clksrc);
err_disable_t1:
if (!tc->tcb_config || tc->tcb_config->counter_width != 32)
clk_disable_unprepare(tc->clk[1]);
err_disable_t0:
clk_disable_unprepare(t0_clk);