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[ Upstream commit 63acaa8e9c65dc34dc249440216f8e977f5d2748 ] The documentation for the freeze() method says that it "should quiesce the device so that it doesn't generate IRQs or DMA". The unspoken consequence of not doing this is that MSIs aimed at non-boot CPUs may get fully lost if they're sent during the period where the target CPU is offline. The current callbacks for USB HCD do not fully quiesce interrupts, specifically on XHCI. Change to use the full suspend/resume flow for freeze/thaw to ensure interrupts are fully quiesced. This fixes issues where USB devices fail to thaw during hibernation because XHCI misses its interrupt and cannot recover. Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Evan Green <evgreen@chromium.org> Link: https://lore.kernel.org/r/20220421103751.v3.2.I8226c7fdae88329ef70957b96a39b346c69a914e@changeid Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.
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.