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coresight: etb10: fixing the right amount of words to read 

This patch rectifies the amount of words to read when the internal
buffer is deemed bigger than the amount of space available in the
perf ring buffer.

The amount to read is set to the amount of space in the perf ring
buffer rather than being subtracted by it.

Reported-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>
This commit is contained in:
Mathieu Poirier 2016-05-03 11:33:41 -06:00 committed by Greg Kroah-Hartman
parent 237483aa5c
commit b5af0a26da
1 changed files with 1 additions and 1 deletions
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2
drivers/hwtracing/coresight/coresight-etb10.c
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@ -440,7 +440,7 @@ static void etb_update_buffer(struct coresight_device *csdev,
u32 mask = ~(ETB_FRAME_SIZE_WORDS - 1);
/* The new read pointer must be frame size aligned */
to_read -= handle->size & mask;
to_read = handle->size & mask;
/*
* Move the RAM read pointer up, keeping in mind that
* everything is in frame size units.