From: Viresh Kumar viresh.kumar@linaro.org
[ Upstream commit cb60e9602cce1593eb1e9cdc8ee562815078a354 ]
If dev_pm_opp_attach_genpd() is called multiple times (once for each CPU sharing the table), then it would result in unwanted behavior like memory leak, attaching the domain multiple times, etc.
Handle that by checking and returning earlier if the domains are already attached. Now that dev_pm_opp_detach_genpd() can get called multiple times as well, we need to protect that too.
Note that the virtual device pointers aren't returned in this case, as they may become unavailable to some callers during the middle of the operation.
Reported-by: Stephan Gerhold stephan@gerhold.net Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/opp/core.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 3ca7543142bf3..1a95ad40795be 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -1949,6 +1949,9 @@ static void _opp_detach_genpd(struct opp_table *opp_table) { int index;
+ if (!opp_table->genpd_virt_devs) + return; + for (index = 0; index < opp_table->required_opp_count; index++) { if (!opp_table->genpd_virt_devs[index]) continue; @@ -1995,6 +1998,9 @@ struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, if (!opp_table) return ERR_PTR(-ENOMEM);
+ if (opp_table->genpd_virt_devs) + return opp_table; + /* * If the genpd's OPP table isn't already initialized, parsing of the * required-opps fail for dev. We should retry this after genpd's OPP