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The device tree binding for stmmac says:
- Multiple TX Queues parameters: below the list of all the parameters to
configure the multiple TX queues:
- snps,tx-queues-to-use: number of TX queues to be used in the driver
[...]
- For each TX queue
[...]
However, if one specifies snps,tx-queues-to-use = 2,
but omits the queue subnodes, or defines just one queue subnode,
since the driver appears to initialize queues with sane default
values, we will get tx queue timeouts.
This is because the initialization code only initializes
as many queues as it finds subnodes. Potentially leaving
some queues uninitialized.
To avoid hard to debug issues, return an error if the number
of subnodes differ from snps,tx-queues-to-use/snps,rx-queues-to-use.
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.