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firmware: add sanity check on shutdown/suspend

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The firmware API should not be used after we go to suspend
and after we reboot/halt. The suspend/resume case is a bit
complex, so this documents that so things are clearer.

We want to know about users of the API in incorrect places so
that their callers are corrected, so this also adds a warn
for those cases.

Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luis R. Rodriguez
2017-05-02 01:31:05 -07:00
committed by Greg Kroah-Hartman
parent a669f04ab4
commit 81f9507628
2 changed files with 110 additions and 0 deletions
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11
Documentation/driver-api/firmware/request_firmware.rst
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@@ -44,6 +44,17 @@ request_firmware_nowait
.. kernel-doc:: drivers/base/firmware_class.c
:functions: request_firmware_nowait
Considerations for suspend and resume
=====================================
During suspend and resume only the built-in firmware and the firmware cache
elements of the firmware API can be used. This is managed by fw_pm_notify().
fw_pm_notify
------------
.. kernel-doc:: drivers/base/firmware_class.c
:functions: fw_pm_notify
request firmware API expected driver use
========================================