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0ec38df36e
The ice driver uses threaded IRQ for managing Tx timestamps via the devm_request_threaded_irq() interface. The ice_misc_intr() handler function is responsible for processing the hard interrupt context, and can wake the ice_misc_intr_thread_fn() by returning IRQ_WAKE_THREAD. The request_threaded_irq() function comment says: @handler is still called in hard interrupt context and has to check whether the interrupt originates from the device. If yes, it needs to disable the interrupt on the device and return IRQ_WAKE_THREAD which will wake up the handler thread and run the @thread_fn. We currently re-enable the Other Interrupt Cause Register (OCIR) at the end of ice_misc_intr(). In practice, this seems to be ok, but it can make communicating between the handler function and the thread function difficult. This is because the interrupt can trigger again while the thread function is still processing. Move the OICR update to the end of the thread function, leaving the other interrupt cause disabled in hardware until we complete one pass of the thread function. This prevents the miscellaneous interrupt from firing until after we finish the thread function. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Arpana Arland <arpanax.arland@intel.com> (A Contingent worker at Intel) Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> |
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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.