tree a33f799a5dd05f798b9121564ba5e9674766fc6f
parent 53c71269fc7ffb26ab0e7d625872276df2d4f145
author sunilm <sunilm.samsung@gmail.com> 1349287403 +0530
committer Gerrit <chrome-bot@google.com> 1349282599 -0700

ARM: SAMSUNG: adc: make waitq part of client structure

Moved local waitq instance from s3c_adc_read function to s3c_adc_client
structure which is global. This makes the ADC operation more robust and
ensure there is no memory corruption.

Occasional cases (during stress test) found src_adc_read function
woke up and exited before completing last action (spinlock restore) in the
__wake_up function which is part of ADC IRQ handler. This caused memory
corruption and found subsequent function crashed due to this.

BUG=chromeos-partner:14648
TEST=Ran ADC stress test for several hours
 cd /sys/devices/platform/ncp15wb473.0/
 while true; do cat temp1_input > /dev/null; done&
 while true; do cat temp1_input > /dev/null; done&
 while true; do cat temp1_input > /dev/null; done&
 while true; do cat temp1_input > /dev/null; done&
 while true; do cat temp1_input > /dev/null; done&
 while true; do cat temp1_input > /dev/null; done&
 while true; do cat temp1_input > /dev/null; done&
 while true; do cat temp1_input > /dev/null; done&

Change-Id: I52730669b2537cae32b8f4ef94750d8723c4cd6a
Signed-off-by: Sunil Mazhavanchery <sunilm@samsung.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/34504
Commit-Ready: Doug Anderson <dianders@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>