soc/tegra: pmc: Ensure mutex is always initialised

The mutex used by the PMC driver may not be initialised if early
initialisation of the driver fails. If this does happen, then it could
be possible for callers of the public PMC functions to still attempt to
acquire the mutex. Fix this by initialising the mutex as soon as
possible to ensure it will always be initialised.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index ed2b2c83e4eb8ec0e5b09b08adf78f29e36e7f2f..483d54623ec5282de19bffde3b44296de2800dc5 100644 (file)
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1504,6 +1504,8 @@ static int __init tegra_pmc_early_init(void)
        bool invert;
        u32 value;
 
+       mutex_init(&pmc->powergates_lock);
+
        np = of_find_matching_node_and_match(NULL, tegra_pmc_match, &match);
        if (!np) {
                /*
@@ -1548,8 +1550,6 @@ static int __init tegra_pmc_early_init(void)
                return -ENXIO;
        }
 
-       mutex_init(&pmc->powergates_lock);
-
        if (np) {
                pmc->soc = match->data;