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[ Upstream commit fc4e97726530241d96dd7db72eb65979217422c9 ] None of the callers of drm_panel_get_modes() expect it to return negative error codes. Either they propagate the return value in their struct drm_connector_helper_funcs .get_modes() hook (which is also not supposed to return negative codes), or add it to other counts leading to bogus values. On the other hand, many of the struct drm_panel_funcs .get_modes() hooks do return negative error codes, so handle them gracefully instead of propagating further. Return 0 for no modes, whatever the reason. Cc: Neil Armstrong <neil.armstrong@linaro.org> Cc: Jessica Zhang <quic_jesszhan@quicinc.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: stable@vger.kernel.org Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/79f559b72d8c493940417304e222a4b04dfa19c4.1709913674.git.jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Sasha Levin <sashal@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.