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When introducing the ability for drivers to indicate the minimum number of buffers they require an application to allocate, commit6662edcd32("media: videobuf2: Add min_reqbufs_allocation field to vb2_queue structure") also introduced a global minimum of 2 buffers. It turns out this breaks the Renesas R-Car VSP test suite, where a test that allocates a single buffer fails when two buffers are used. One may consider debatable whether test suite failures without failures in production use cases should be considered as a regression, but operation with a single buffer is a valid use case. While full frame rate can't be maintained, memory-to-memory devices can still be used with a decent efficiency, and requiring applications to allocate multiple buffers for single-shot use cases with capture devices would just waste memory. For those reasons, fix the regression by dropping the global minimum of buffers. Individual drivers can still set their own minimum. Fixes:6662edcd32("media: videobuf2: Add min_reqbufs_allocation field to vb2_queue structure") Cc: stable@vger.kernel.org Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Acked-by: Tomasz Figa <tfiga@chromium.org> Link: https://lore.kernel.org/r/20240825232449.25905-1-laurent.pinchart+renesas@ideasonboard.com Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.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 reStructuredText 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.