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author | John Stultz <john.stultz@linaro.org> | 2020-02-25 08:08:23 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-04 20:11:44 +0300 |
commit | c8c43cee29f6ca2575c953ae600263690db28f41 (patch) | |
tree | 5be9b1416296cd29c26d38638ff2320de182697a /drivers/of/fdt.c | |
parent | e94f62b7140fa3da4c69a685b2e73ef52dd32c51 (diff) | |
download | linux-c8c43cee29f6ca2575c953ae600263690db28f41.tar.xz |
driver core: Fix driver_deferred_probe_check_state() logic
driver_deferred_probe_check_state() has some uninituitive behavior.
* From boot to late_initcall, it returns -EPROBE_DEFER
* From late_initcall to the deferred_probe_timeout (if set)
it returns -ENODEV
* If the deferred_probe_timeout it set, after it fires, it
returns -ETIMEDOUT
This is a bit confusing, as its useful to have the function
return -EPROBE_DEFER while the timeout is still running. This
behavior has resulted in the somwhat duplicative
driver_deferred_probe_check_state_continue() function being
added.
Thus this patch tries to improve the logic, so that it behaves
as such:
* If late_initcall has passed, and modules are not enabled
it returns -ENODEV
* If modules are enabled and deferred_probe_timeout is set,
it returns -EPROBE_DEFER until the timeout, afterwhich it
returns -ETIMEDOUT.
* In all other cases, it returns -EPROBE_DEFER
This will make the deferred_probe_timeout value much more
functional, and will allow us to consolidate the
driver_deferred_probe_check_state() and
driver_deferred_probe_check_state_continue() logic in a later
patch.
Cc: linux-pm@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Saravana Kannan <saravanak@google.com>
Cc: Todd Kjos <tkjos@google.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Kevin Hilman <khilman@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Link: https://lore.kernel.org/r/20200225050828.56458-2-john.stultz@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/of/fdt.c')
0 files changed, 0 insertions, 0 deletions