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reset: warn on invalid input to reset_control_reset/assert/deassert/status

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Instead of potentially crashing, dump a backtrace and return -EINVAL if
rstc is NULL or an error code.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Philipp Zabel 2016-06-20 13:05:14 +02:00
parent 54e991b566
commit a3774e146a
1 changed files with 11 additions and 1 deletions
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12
drivers/reset/core.c
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@ -138,7 +138,8 @@ EXPORT_SYMBOL_GPL(devm_reset_controller_register);
*/
int reset_control_reset(struct reset_control *rstc)
{
if (WARN_ON(rstc->shared))
if (WARN_ON(IS_ERR_OR_NULL(rstc)) ||
WARN_ON(rstc->shared))
return -EINVAL;
if (rstc->rcdev->ops->reset)
@ -161,6 +162,9 @@ EXPORT_SYMBOL_GPL(reset_control_reset);
*/
int reset_control_assert(struct reset_control *rstc)
{
if (WARN_ON(IS_ERR_OR_NULL(rstc)))
return -EINVAL;
if (!rstc->rcdev->ops->assert)
return -ENOTSUPP;
@ -184,6 +188,9 @@ EXPORT_SYMBOL_GPL(reset_control_assert);
*/
int reset_control_deassert(struct reset_control *rstc)
{
if (WARN_ON(IS_ERR_OR_NULL(rstc)))
return -EINVAL;
if (!rstc->rcdev->ops->deassert)
return -ENOTSUPP;
@ -204,6 +211,9 @@ EXPORT_SYMBOL_GPL(reset_control_deassert);
*/
int reset_control_status(struct reset_control *rstc)
{
if (WARN_ON(IS_ERR_OR_NULL(rstc)))
return -EINVAL;
if (rstc->rcdev->ops->status)
return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);