qdsp5: audio: Set audio stopped flag before calling wakeup

During audio flush and stop command processing, wakeup on read
and write wait queue is done first and then audio stopped flag
is set to true. If a process waiting on read and write queue gets
scheduled first before stopped flag is set then this may result in
read or write command being sent to DSP after adsp disable operation,
which is unexpected.

Fix this by setting stopped flag before calling wakeup.

Change-Id: I20ef197e572d0ffc015d6004296ea7b9f5db2806
Signed-off-by: Manish Dewangan <manish@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/qdsp5/audio_aac_in.c
	arch/arm/mach-msm/qdsp5/audio_evrc_in.c
	arch/arm/mach-msm/qdsp5/audio_pcm_in.c
	arch/arm/mach-msm/qdsp5/audio_qcelp_in.c
qdsp5: audio: Protect common data between ADSP ISR and flush operation

During NEEDS_DATA or BUFFER_UPDATE event processing in ISR
context, if flush command is issued by application then
there is chance of concurrent access of some of the variables
shared between ISR and Process context. This may result in race
condition causing values of these shared variables to be
inconsistent.

Fix this by protecting these variables using spin lock. Also corrected
locking sequence order in encode drivers.

Change-Id: I06b4d08053ad13d1b118ab6f29e69e95b49d133f
Signed-off-by: Manish Dewangan <manish@codeaurora.org>

Conflicts:

	arch/arm/mach-msm/qdsp5/audio_aac.c
	arch/arm/mach-msm/qdsp5/audio_aac_in.c
	arch/arm/mach-msm/qdsp5/audio_amrnb.c
	arch/arm/mach-msm/qdsp5/audio_amrwb.c
	arch/arm/mach-msm/qdsp5/audio_evrc.c
	arch/arm/mach-msm/qdsp5/audio_evrc_in.c
	arch/arm/mach-msm/qdsp5/audio_mp3.c
	arch/arm/mach-msm/qdsp5/audio_pcm.c
	arch/arm/mach-msm/qdsp5/audio_qcelp.c
	arch/arm/mach-msm/qdsp5/audio_qcelp_in.c
	arch/arm/mach-msm/qdsp5/audio_wma.c
	arch/arm/mach-msm/qdsp5/audio_wmapro.c
msm: qdsp5: Avoid race condition of init info cmd being sent multiple times

GET_INIT_INFO command is sent to modem adsp service to get the information
such as task/queues supported by adsp. This command is sent whenever
msm_adsp_get() is called first time by any decoder/encoder drivers. This
command needs to be sent only once, to achieve this a global flag
init_info_cmd_sent is set in msm_get_adsp() after sending GET_INIT_INFO
command to adsp services. Currently flag init_info_cmd_sent is not
protected by any lock. Hence there is chance of GET_INIT_INFO command
being sent multiple times if there are concurrent calls to msm_adsp_get()
where each caller observes flag init_info_cmd_sent not to be set.

Fix this by protecting adsp info initialization sequence with mutex.

Change-Id: Ib0bd865d44e4687f9a85b56854e1fd3277a5707d
Signed-off-by: Manish Dewangan <manish@codeaurora.org>
qdsp5: adsp: Add NULL check in adsp driver functions

ADSP driver functions are directly accessing module without checking
for NULL. This can result in crash if module supplied points to NULL.

Added NULL check to solve this.

Change-Id: I47eef0ea03086935ebfe33a2585ba214780e73f7
Signed-off-by: Manish Dewangan <manish@codeaurora.org>
msm: qdsp5: Initialize event length during adsp fake event generation

During adsp fake event generation, event length is not getting
initialized. This sometimes results in incorrect event data being read
during fake event processing by adsp driver clients.

Fix this by initializing event length properly before generating the
fake event.

Change-Id: Ifcab5adf542b04eef3dc03913b8e10c68f686e8c
Signed-off-by: Manish Dewangan <manish@codeaurora.org>