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coresight: Handle errors in finding input/output ports 

If we fail to find the input / output port for a LINK component
while enabling a path, we should fail gracefully rather than
assuming port "0".

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>
hifive-unleashed-5.1
Suzuki K Poulose 2018-07-11 13:40:28 -06:00 committed by Greg Kroah-Hartman
parent 5756949782
commit fe470f5f7f
1 changed files with 5 additions and 2 deletions
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7
drivers/hwtracing/coresight/coresight.c
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@ -107,7 +107,7 @@ static int coresight_find_link_inport(struct coresight_device *csdev,
dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
dev_name(&parent->dev), dev_name(&csdev->dev));
return 0;
return -ENODEV;
}
static int coresight_find_link_outport(struct coresight_device *csdev,
@ -125,7 +125,7 @@ static int coresight_find_link_outport(struct coresight_device *csdev,
dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
dev_name(&csdev->dev), dev_name(&child->dev));
return 0;
return -ENODEV;
}
static int coresight_enable_sink(struct coresight_device *csdev, u32 mode)
@ -178,6 +178,9 @@ static int coresight_enable_link(struct coresight_device *csdev,
else
refport = 0;
if (refport < 0)
return refport;
if (atomic_inc_return(&csdev->refcnt[refport]) == 1) {
if (link_ops(csdev)->enable) {
ret = link_ops(csdev)->enable(csdev, inport, outport);