6.10-stable review patch. If anyone has any objections, please let me know.
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From: Ulf Hansson ulf.hansson@linaro.org
[ Upstream commit b87eee38605c396f0e1fa435939960e5c6cd41d6 ]
There is no need to hold the genpd-lock, while assigning the dev->pm_domain. In fact, it becomes a problem on a PREEMPT_RT based configuration as the genpd-lock may be a raw spinlock, while the lock acquired through the call to dev_pm_domain_set() is a regular spinlock.
To fix the problem, let's simply move the calls to dev_pm_domain_set() outside the genpd-lock.
Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Tested-by: Raghavendra Kakarla quic_rkakarla@quicinc.com # qcm6490 with PREEMPT_RT set Acked-by: Sebastian Andrzej Siewior bigeasy@linutronix.de Link: https://lore.kernel.org/r/20240527142557.321610-3-ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pmdomain/core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c index 0ab6008e863e8..4134a8344d2da 100644 --- a/drivers/pmdomain/core.c +++ b/drivers/pmdomain/core.c @@ -1694,7 +1694,6 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, genpd_lock(genpd);
genpd_set_cpumask(genpd, gpd_data->cpu); - dev_pm_domain_set(dev, &genpd->domain);
genpd->device_count++; if (gd) @@ -1703,6 +1702,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
genpd_unlock(genpd); + dev_pm_domain_set(dev, &genpd->domain); out: if (ret) genpd_free_dev_data(dev, gpd_data); @@ -1759,12 +1759,13 @@ static int genpd_remove_device(struct generic_pm_domain *genpd, genpd->gd->max_off_time_changed = true;
genpd_clear_cpumask(genpd, gpd_data->cpu); - dev_pm_domain_set(dev, NULL);
list_del_init(&pdd->list_node);
genpd_unlock(genpd);
+ dev_pm_domain_set(dev, NULL); + if (genpd->detach_dev) genpd->detach_dev(genpd, dev);