opp: Prevent memory leak in dev_pm_opp_attach_genpd()

[ 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>

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 91dcad982d362bc4441c18911574ca5198073458..11d192fb2e813bb8a7f4a76851078e7e6ebe2053 100644 (file)
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1918,6 +1918,9 @@ 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;
@@ -1964,6 +1967,9 @@ 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