From cc5454490b514a87ccf99fce7ee224cc95980d99 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Fri, 10 Apr 2015 09:25:36 -0600 Subject: [PATCH] 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 Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-etb10.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c index 4004986..46eb9f8 100644 --- 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) -- 2.7.4