coresight: etb10: Print size of buffer we fail to allocate

When we initialise the ETB driver we attempt to allocate a buffer suitable
for storing the data buffered in the hardware based on sizing information
reported by the hardware. Unfortunately if the hardware is not properly
configured (for example if power domains are not set up correctly) then we
may read back a nonsensically large value and therefore the allocation will
be too big to succeed. Print an error message showing the amount of memory
we tried to allocate if the buffer allocation fails to help users diagnose
such problems.

Normally it is bad practice to print an error message on memory allocation
failures since there are verbose core messages reported for this but in
this case where the allocation size might be incorrect it is a useful hint.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 40049869aecdfb3909f018145b90b32846af8588..46eb9f88a29f02c57f0be0c97b09980d6564fe34 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -462,8 +462,11 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 
        drvdata->buf = devm_kzalloc(dev,
                                    drvdata->buffer_depth * 4, GFP_KERNEL);
-       if (!drvdata->buf)
+       if (!drvdata->buf) {
+               dev_err(dev, "Failed to allocate %u bytes for buffer data\n",
+                       drvdata->buffer_depth * 4);
                return -ENOMEM;
+       }
 
        desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
        if (!desc)