tree 3cc3de1b2ee2fa78970296bc949186aeeff6eac7
parent 3800e6f944e929ddfcd9320a51e13a67fd1956ff
author Takashi Sakamoto <o-takashi@sakamocchi.jp> 1455954061 +0900
committer Takashi Iwai <tiwai@suse.de> 1455979598 +0100

ALSA: fireworks: serialize transactions to update connections at bus reset

In IEC 61883-1, at bus-reset, applications can continue isochronous
streaming by updating connections. In ALSA fireworks driver, the
operation is executed in 'update' handler for bus driver.

The connection resources are also changed in process contexts of PCM/MIDI
applications. Therefore, bus-reset handling has race condition
against connection. Current ALSA fireworks driver has a bug for the
condition.

This commit fixes the bug, by expand critical section with mutex. As a
result, connection updating operation in bus-reset handler and connection
changing operation in process context are serialized.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>