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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-09-20 13:18:14 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 20:09:19 +0200
commitf92201b1ab95b3f17c3fa9df8f88dc521e0b604f (patch)
tree2aac53008737e605c99280d68bd42abb89326ba6 /drivers/hwtracing
parentf13d7c0835c383e318e28cc9f34b002fc8c85f61 (diff)
downloadlinux-stericsson-f92201b1ab95b3f17c3fa9df8f88dc521e0b604f.tar.gz
coresight: catu: Claim device before use
Use the CLAIM protocol to grab the ownership of the component when in use. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-catu.c6
1 files changed, 6 insertions, 0 deletions
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;