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Russell King says: ==================== net: phy: avoid race when erroring stopping PHY This series addresses a problem reported by Jijie Shao where the PHY state machine can race with phy_stop() leading to an incorrect state. The issue centres around phy_state_machine() dropping the phydev->lock mutex briefly, which allows phy_stop() to get in half-way through the state machine, and when the state machine resumes, it overwrites phydev->state with a value incompatible with a stopped PHY. This causes a subsequent phy_start() to issue a warning. We address this firstly by using versions of functions that do not take tne lock, moving them into the locked region. The only function that this can't be done with is phy_suspend() which needs to call into the driver without taking the lock. For phy_suspend(), we split the state machine into two parts - the initial part which runs under the phydev->lock, and the second part which runs without the lock. We finish off by using the split state machine in phy_stop() which removes another unnecessary unlock-lock sequence from phylib. Changes from RFC: - Added Jijie Shao's tested-by ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.