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Currently, each line card is initialized using the following steps: 1. Initializing its various fields (e.g., slot index). 2. Creating the corresponding devlink object. 3. Enabling events (i.e., traps) for changes in line card status. 4. Querying and processing line card status. Unlike traps, the IRQ that notifies the CPU about line card status changes cannot be enabled / disabled on a per line card basis. If a handler is registered before the line cards are initialized, the handler risks accessing uninitialized memory. On the other hand, if the handler is registered after initialization, we risk missing events. For example, in step 4, the driver might see that a line card is in ready state and will tell the device to enable it. When enablement is done, the line card will be activated and the IRQ will be triggered. Since a handler was not registered, the event will be missed. Solve this by splitting the initialization sequence into two steps (1-2 and 3-4). In a subsequent patch, the handler will be registered between both steps. Signed-off-by: Vadim Pasternak <vadimp@nvidia.com> Reviewed-by: Jiri Pirko <jiri@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: Petr Machata <petrm@nvidia.com> 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.