This patch moves access to the CLAIM tag so that no modification to the HW happens before and after the CLAIM operation has been carried.
Signed-off-by: Mathieu Poirier <[email protected]> Reviewed-by: Suzuki K Poulose <[email protected]> --- drivers/hwtracing/coresight/coresight-etm3x.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index fd5c4cca7db5..6f30d52da9e4 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -363,15 +363,16 @@ static int etm_enable_hw(struct etm_drvdata *drvdata) CS_UNLOCK(drvdata->base); + rc = coresight_claim_device_unlocked(drvdata->base); + if (rc) + goto done; + /* Turn engine on */ etm_clr_pwrdwn(drvdata); /* Apply power to trace registers */ etm_set_pwrup(drvdata); /* Make sure all registers are accessible */ etm_os_unlock(drvdata); - rc = coresight_claim_device_unlocked(drvdata->base); - if (rc) - goto done; etm_set_prog(drvdata); @@ -422,8 +423,6 @@ static int etm_enable_hw(struct etm_drvdata *drvdata) etm_clr_prog(drvdata); done: - if (rc) - etm_set_pwrdwn(drvdata); CS_LOCK(drvdata->base); dev_dbg(drvdata->dev, "cpu: %d enable smp call done: %d\n", @@ -577,9 +576,9 @@ static void etm_disable_hw(void *info) for (i = 0; i < drvdata->nr_cntr; i++) config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i)); + etm_set_pwrdwn(drvdata); coresight_disclaim_device_unlocked(drvdata->base); - etm_set_pwrdwn(drvdata); CS_LOCK(drvdata->base); dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu); -- 2.7.4
