[PATCH RESEND 0/4] Fix some errors in the devfreq core layer when governor is NULL

[Yaxiong Tian]

While doing some development work with devfreq_add_governor()/
devfreq_remove_governor(), I discovered several bugs caused when
devfreq->governor is NULL. Specifically:

1) A possible null pointer issue in devfreq_add_governor(), caused
by devfreq_remove_governor() setting devfreq->governor to NULL in
certain situations, while devfreq_add_governor() lacks corresponding
checks for devfreq->governor.

2) When operating on governor and available_governors under /sys,
there are also some unexpected errors.

See the following patches for details.

Yaxiong Tian (4):
  PM / devfreq: Fix possible null pointer issue in
    devfreq_add_governor()
  PM / devfreq: Fix available_governors_show() when no governor is set
  PM / devfreq: Fix governor_store() failing when device has no current
    governor
  PM / devfreq: Optimize error return value of governor_show()

 drivers/devfreq/devfreq.c | 46 +++++++++++++++++++++------------------
 1 file changed, 25 insertions(+), 21 deletions(-)

-- 
2.25.1