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authorBoris BREZILLON <b.brezillon@overkiz.com>2013-10-02 14:35:41 +0200
committerDaniel Lezcano <daniel.lezcano@linaro.org>2013-10-03 16:28:30 +0200
commit5b3c11da141c27df6f8dd8acf90c0046ebab3a07 (patch)
tree95b7895c4423232cbd9d94f6a377ffcd168cb360 /drivers/clocksource
parentclocksource: tcb_clksrc: Replace clk_enable/disable with clk_prepare_enable/d... (diff)
downloadlinux-5b3c11da141c27df6f8dd8acf90c0046ebab3a07.tar.xz
linux-5b3c11da141c27df6f8dd8acf90c0046ebab3a07.zip
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>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/tcb_clksrc.c33
1 files changed, 28 insertions, 5 deletions
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index 048156291fa0..10a5d9ef23f5 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -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);