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 3ca7543142bf36465a9df1ce4bfc3fa8a38b60e0..1a95ad40795be6476c470ab9a14f5862c02bc33f 100644 (file)
--- 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