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Services are supposed to generate an interrupt once completed, whether or not they have do so successfully. What appears to be a bug in the system controller means that interrupts are only generated for *successful* services. Currently, the status of a service is only checked in the mpfs_mbox_rx_data() once an interrupt is received. As it turns out, this is not really helpful where the potentially buggy behaviour is present, as we'll only see the status for successes where it is moot anyway. Jassi suggested moving the check to the .tx_done() callback instead. This makes sense, as the busy bit that tx_done() is polling will be lowered on completion, regardless of whether the service passed or failed. That allows us to check the status bits for all services, whether they generate an interrupt or not & pass something more informative than -EBADMSG back to the drivers implementing individual services. Suggested-by: Jassi Brar <jassisinghbrar@gmail.com> Acked-by: Jassi Brar <jaswinder.singh@linaro.org> Tested-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
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.