[PATCH 39/44] coresight: catu: Claim device before use

[Mathieu Poirier]

From: Suzuki K Poulose <suzuki.poul...@arm.com>

Use the CLAIM protocol to grab the ownership of the component when
in use.

Cc: Mathieu Poirier <mathieu.poir...@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poul...@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
 drivers/hwtracing/coresight/coresight-catu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c 
b/drivers/hwtracing/coresight/coresight-catu.c
index ff94e58845b7..170fbb66bda2 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -406,6 +406,7 @@ static inline int catu_wait_for_ready(struct catu_drvdata 
*drvdata)
 
 static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
 {
+       int rc;
        u32 control, mode;
        struct etr_buf *etr_buf = data;
 
@@ -418,6 +419,10 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, 
void *data)
                return -EBUSY;
        }
 
+       rc = coresight_claim_device_unlocked(drvdata->base);
+       if (rc)
+               return rc;
+
        control |= BIT(CATU_CONTROL_ENABLE);
 
        if (etr_buf && etr_buf->mode == ETR_MODE_CATU) {
@@ -459,6 +464,7 @@ static int catu_disable_hw(struct catu_drvdata *drvdata)
        int rc = 0;
 
        catu_write_control(drvdata, 0);
+       coresight_disclaim_device_unlocked(drvdata->base);
        if (catu_wait_for_ready(drvdata)) {
                dev_info(drvdata->dev, "Timeout while waiting for READY\n");
                rc = -EAGAIN;
-- 
2.7.4