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Problem background: In the process of suspend, maybe some device suspend callback failed in dpm_suspend_start()/dpm_prepare()/dpm_suspend(). Because it's after suspend_console(), so printf() is disabled now. Currently we can see "Some devices failed to suspend, or early wake event detected" by log_suspend_abort_reason() in bugreport. There are many devices but we don't know which exactly device failed. So we want to do a little change to record which device failed. Note: I checked upstream LTS kernel, then I found the patch can not be sent upstream, because it uses function log_suspend_abort_reason() in wakeup_reason.c, the initial patch(https://patchwork.kernel.org/patch/3827331/) for adding /kernel/power/wakeup_reason.c is not accepted by upstream which was merged in AOSP common kernels. So maybe the patch could only be sent to AOSP common kernels. Test: manual - Use modified version for daily use two days, from bugreport we can see which device failed. Bug: 120445600 Change-Id: I326c87ca1263496db79d08ec615f12fc22452d7a Signed-off-by: zhuguangqing <zhuguangqing@xiaomi.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.