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commit056a3da5d0upstream. Some users reported the kernel WARNING with stack traces from hdmi_pcm_close(), and it's the line checking the per_cvt->assigned flag. This used to be a valid check in the past because the flag was turned on/off only at opening and closing a PCM stream. Meanwhile, since the introduction of the silent-stream mode, this flag may be turned on/off at the monitor connection/disconnection time, which isn't always associated with the PCM open/close. Hence this may lead to the inconsistent per_cvt->assigned flag at closing. As the check itself became almost useless and confuses users as if it were a serious problem, just drop the check. Fixes:b1a5039759("ALSA: hda/hdmi: fix silent stream for first playback to DP") Cc: <stable@vger.kernel.org> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=210987 Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Link: https://lore.kernel.org/r/20210211083139.29531-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.