688de12f08
A transmit on the modem netdev can only complete if the IPA hardware is powered. Currently, if a transmit request arrives when the hardware was not powered, further transmits are be stopped to allow power-up to complete. Once power-up completes, transmits are once again enabled. Runtime resume can complete at the same time a transmit request is being handled, and previously there was a race between stopping and restarting transmits. The STARTED flag was used to ensure the stop request in the transmit path was skipped if the start request in the runtime resume path had already occurred. Now, the queue is *always* stopped in the transmit path, *before* determining whether power is ACTIVE. If power is found to already be active (or if the socket buffer is gets dropped), transmit is re-enabled. Otherwise it will (always) be enabled after runtime resume completes. The race between transmit and runtime resume no longer exists, so there is no longer any need to maintain the STARTED flag. Signed-off-by: Alex Elder <elder@linaro.org> Link: https://lore.kernel.org/r/20240130192305.250915-4-elder@linaro.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.