clocksource/drivers/sun5i: Handle error returns from devm_reset_control_get_optional_...

The devm_reset_control_get_optional_exclusive() function may return an
ERR_PTR in case of genuine reset control acquisition errors, not just
NULL which indicates the legitimate absence of an optional reset.

Add an IS_ERR() check after the call in sun5i_timer_probe(). On error,
return the error code to ensure proper failure handling rather than
proceeding with invalid pointers.

Fixes: 7e5bac610d2f ("clocksource/drivers/sun5i: Convert to platform device driver")
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Acked-by: Chen-Yu Tsai <wens@kernel.org>
Link: https://patch.msgid.link/20260205084037.3661261-1-nichen@iscas.ac.cn

diff --git a/drivers/clocksource/timer-sun5i.c b/drivers/clocksource/timer-sun5i.c
index f827d3f98f60e640c42574a60c784b3129050f86..d7e012992170b7c03fd337d8961a412ed68b77f9 100644 (file)
--- a/drivers/clocksource/timer-sun5i.c
+++ b/drivers/clocksource/timer-sun5i.c
@@ -286,6 +286,9 @@ static int sun5i_timer_probe(struct platform_device *pdev)
        }
 
        rstc = devm_reset_control_get_optional_exclusive(dev, NULL);
+       if (IS_ERR(rstc))
+               return dev_err_probe(dev, PTR_ERR(rstc),
+                                    "failed to get reset\n");
        if (rstc)
                reset_control_deassert(rstc);