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Cássio Gabriel dbf079a6ce ALSA: firewire-tascam: Do not drop unread control events 
commit 0749daa8eb upstream.

tscm_hwdep_read_queue() copies as many queued control events as fit in
the userspace buffer. When the buffer is smaller than the current
contiguous queue segment, length is rounded down to the number of bytes
that can be copied.

However, after copying that shortened length, the code advances pull_pos
to the original tail_pos, marking the whole contiguous segment as
consumed. Any events between the copied portion and tail_pos are lost.

Limit tail_pos to the position after the entries actually copied before
updating pull_pos. When the whole segment fits, this is equivalent to the
old tail_pos update; when the buffer is smaller, the remaining events
stay queued for the next read.

Fixes: a8c0d13267 ("ALSA: firewire-tascam: notify events of change of state for userspace applications")
Cc: stable@vger.kernel.org
Suggested-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Co-developed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260503-alsa-firewire-tascam-read-queue-v2-1-126c6efd7642@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-06-01 17:35:20 +02:00
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README 

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.