linux/drivers/hwtracing/coresight
Mathieu Poirier f74debbea0 coresight: tmc: getting rid of multiple read access
Allowing multiple readers to access the trace data simultaniously
via sysFS provides no shortage of opportunity for race condition,
mandates two variable to be maintained (drvdata::read_count and
drvdata::reading), makes the code complex and provide little
advantages, if any.

This patch streamlines the read process by restricting trace data
access to a single user.  That way drvdata::read_count can
be eliminated and race conditions (along with faulty error handling)
in function tmc_open() and tmc_release() eliminated.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-05-03 14:59:30 -07:00
..
coresight-etb10.c coresight: etb10: fixing the right amount of words to read 2016-05-03 14:59:30 -07:00
coresight-etm3x-sysfs.c coresight: moving coresight_simple_func() to header file 2016-05-01 14:12:14 -07:00
coresight-etm3x.c drivers/hwtracing: make coresight-* explicitly non-modular 2016-02-20 14:11:01 -08:00
coresight-etm4x-sysfs.c coresight: moving coresight_simple_func() to header file 2016-05-01 14:12:14 -07:00
coresight-etm4x.c coresight: etm4x: add tracer ID for A72 Maia processor. 2016-05-03 14:59:30 -07:00
coresight-etm4x.h coresight: etm4x: modify q_support type 2016-05-03 14:59:30 -07:00
coresight-etm-cp14.c
coresight-etm-perf.c drivers/hwtracing: make coresight-etm-perf.c explicitly non-modular 2016-03-05 12:19:39 -08:00
coresight-etm-perf.h coresight: etm-perf: new PMU driver for ETM tracers 2016-02-20 14:11:01 -08:00
coresight-etm.h coresight: etm3x: implementing user/kernel mode tracing 2016-02-20 14:11:01 -08:00
coresight-funnel.c coresight: removing gratuitous boot time log messages 2016-05-01 14:12:14 -07:00
coresight-priv.h coresight: moving coresight_simple_func() to header file 2016-05-01 14:12:14 -07:00
coresight-replicator-qcom.c drivers/hwtracing: make coresight-* explicitly non-modular 2016-02-20 14:11:01 -08:00
coresight-replicator.c coresight: removing gratuitous boot time log messages 2016-05-01 14:12:14 -07:00
coresight-stm.c coresight: stm: adding driver for CoreSight STM component 2016-05-03 14:59:30 -07:00
coresight-tmc-etf.c coresight: tmc: getting rid of multiple read access 2016-05-03 14:59:30 -07:00
coresight-tmc-etr.c coresight: tmc: getting rid of multiple read access 2016-05-03 14:59:30 -07:00
coresight-tmc.c coresight: tmc: getting rid of multiple read access 2016-05-03 14:59:30 -07:00
coresight-tmc.h coresight: tmc: getting rid of multiple read access 2016-05-03 14:59:30 -07:00
coresight-tpiu.c coresight: removing gratuitous boot time log messages 2016-05-01 14:12:14 -07:00
coresight.c coresight: adding path for STM device 2016-05-03 14:59:30 -07:00
Kconfig coresight: stm: adding driver for CoreSight STM component 2016-05-03 14:59:30 -07:00
Makefile coresight: tmc: splitting driver in ETB/ETF and ETR components 2016-05-03 14:59:30 -07:00
of_coresight.c drivers/hwtracing: make coresight-* explicitly non-modular 2016-02-20 14:11:01 -08:00