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The driver uses in_irq() to determine if the tlan_priv::lock has to be acquired in tlan_mii_read_reg() and tlan_mii_write_reg(). The interrupt handler acquires the lock outside of these functions so the in_irq() check is meant to prevent a lock recursion deadlock. But this check is incorrect when interrupt force threading is enabled because then the handler runs in thread context and in_irq() correctly returns false. The usage of in_*() in drivers is phased out and Linus clearly requested that code which changes behaviour depending on context should either be seperated or the context be conveyed in an argument passed by the caller, which usually knows the context. tlan_set_timer() has this conditional as well, but this function is only invoked from task context or the timer callback itself. So it always has to lock and the check can be removed. tlan_mii_read_reg(), tlan_mii_write_reg() and tlan_phy_print() are invoked from interrupt and other contexts. Split out the actual function body into helper variants which are called from interrupt context and make the original functions wrappers which acquire tlan_priv::lock unconditionally. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Samuel Chessman <chessman@tux.org> Signed-off-by: Jakub Kicinski <kuba@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.