When suspending to idle with the new suspend mode configuration support
we go through the suspend callbacks with a state of PM_SUSPEND_TO_IDLE
which we don't have regulator constraints for, causing an error.  Avoid
this and similar errors by treating missing constraints as a noop.

Reported-by: Geert Uytterhoeven <geert+rene...@glider.be>
Tested-by: Geert Uytterhoeven <geert+rene...@glider.be>
Signed-off-by: Mark Brown <broo...@kernel.org>
---
 drivers/regulator/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 42681c10cbe4..dd4708c58480 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -758,7 +758,7 @@ static int suspend_set_state(struct regulator_dev *rdev,
 
        rstate = regulator_get_suspend_state(rdev, state);
        if (rstate == NULL)
-               return -EINVAL;
+               return 0;
 
        /* If we have no suspend mode configration don't set anything;
         * only warn if the driver implements set_suspend_voltage or
-- 
2.15.1

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