[PATCH 3.19.y-ckt 051/128] ALSA: usb-audio: prevent CH345 multiport output SysEx corruption

3.19.8-ckt12 -stable review patch. If anyone has any objections, please let me know. -- From: Clemens Ladisch commit 1ca8b201309d842642f221db7f02f71c0af5be2d upstream. The CH345 USB MIDI chip has two output ports. However, they are multiplexed through one pin, and the

[PATCH 3.19.y-ckt 051/128] ALSA: usb-audio: prevent CH345 multiport output SysEx corruption

3.19.8-ckt12 -stable review patch. If anyone has any objections, please let me know. -- From: Clemens Ladisch commit 1ca8b201309d842642f221db7f02f71c0af5be2d upstream. The CH345 USB MIDI chip has two output ports. However, they are multiplexed through