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Role swap requests fail unless the current role is either SRC_READY or SNK_READY. This works fine for VCONN and data role swaps, where we immediately enter READY state after reporting a successful role swap to user space. However, on power role changes, the role swap is currently reported as successful while power negotiation is still in process. User space does not know this, and may request another role swap immediately after a power role swap is reported to be complete. This second role swap will fail with -EAGAIN. To fix the problem, report role swap completion after power negotiation is complete and the state machine enters SRC_READY or SNK_READY state. This is better anyway since it captures errors due to failed power negotiations. It also simplifies the code since the number of calls needed to report successful role swaps is reduced. Reported-by: Howard Yen <howard_yen@htc.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.