From: "Michał Mirosław" mirq-linux@rere.qmqm.pl
commit 4b639e254d3d4f15ee4ff2b890a447204cfbeea9 upstream
When a regulator's name equals its supply's name the regulator_resolve_supply() recurses indefinitely. Add a check so that debugging the problem is easier. The "fixed" commit just exposed the problem.
Fixes: aea6cb99703e ("regulator: resolve supply after creating regulator") Cc: stable@vger.kernel.org Reported-by: Ahmad Fatoum a.fatoum@pengutronix.de Signed-off-by: Michał Mirosław mirq-linux@rere.qmqm.pl Tested-by: Ahmad Fatoum a.fatoum@pengutronix.de # stpmic1 Link: https://lore.kernel.org/r/c6171057cfc0896f950c4d8cb82df0f9f1b89ad9.160522667... Signed-off-by: Mark Brown broonie@kernel.org [sudip: adjust context] Signed-off-by: Sudip Mukherjee sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/regulator/core.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1550,6 +1550,12 @@ static int regulator_resolve_supply(stru } }
+ if (r == rdev) { + dev_err(dev, "Supply for %s (%s) resolved to itself\n", + rdev->desc->name, rdev->supply_name); + return -EINVAL; + } + /* Recursively resolve the supply of the supply */ ret = regulator_resolve_supply(r); if (ret < 0) {