[PATCH 0/1] NET: mcan: Move runtime PM enable/disable to m_can_platform

[Patrik Flykt <patrik.flykt@linux.intel.com>]

	Hi,

This is a preparatory patch for modifying PM enabling due to PCI based
M_CAN devices. As the functionality is right now, adding a PCI based
M_CAN driver causes the core PCI functionality to call
pm_runtime_enable() from pci_pm_init() when the PCI device is added.
When the device is added, it is registered with m_can_class_register(),
which ends up calling pm_runtime_enable() once more and causes the
kernel to log an angry 'Unbalanced pm_runtime_enable!' message, as
dev->power.disable_depth has gone down to zero.

To resolve this situation, I have added a patch that moves runtime PM
enabling from m_can.c to the m_can_platform.c driver, which currently
is the only driver that ends up enabling runtime PM. Would this
approach be appropriate, or should PM be enabled in some other way
with PCI based M_CAN devices?

Now, the actual sticky point is that there aren't yet any PCI based
M_CAN devices upstream, but one is in the works. So if the change
proposed works out, should this patch actually be sent in the patch
set providing a PCI based M_CAN device?


Thanks,

	Patrik


Patrik Flykt (1):
  NET: mcan: Move runtime PM enable/disable to m_can_platform

 drivers/net/can/m_can/m_can.c          | 6 +-----
 drivers/net/can/m_can/m_can_platform.c | 3 +++
 2 files changed, 4 insertions(+), 5 deletions(-)

-- 
2.27.0