From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@xxxxxxx> CPUs are registered as devices and their OPPs can be initialised from the device tree. Whenever CPUs can be hotplugged out, the corresponding cpu devices are not removed. As a result all their OPPs remain intact even when they are offlined. But when they are hotplugged back-in, the cpufreq along with other cpu related subsystem gets re-initialised. Since its almost same as secondary cpu being brought up, no special consideration is taken in the hotplug path. As a result of this the cpufreq will try to initialise the OPPs again though the cpu device already contains the OPPs. This patch checks if there exist an OPP list associated with the device, before attempting to initialise it. Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@xxxxxxx> --- drivers/base/power/opp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c index 4dfdc01..66d52d2 100644 --- a/drivers/base/power/opp.c +++ b/drivers/base/power/opp.c @@ -706,6 +706,11 @@ static int of_init_opp_table_from_ofnode(struct device *dev, const __be32 *val; int nr; + /* Check for existing list for 'dev' */ + dev_opp = find_device_opp(dev); + if (!IS_ERR(dev_opp)) + return 0; /* Device OPP already initialized */ + prop = of_find_property(of_node, "operating-points", NULL); if (!prop) return -ENODEV; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
