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authorMathieu Poirier <mathieu.poirier@linaro.org>2016-05-03 11:33:41 -0600
committerMathieu Poirier <mathieu.poirier@linaro.org>2016-06-01 15:45:22 -0600
commit143e92c2248c24712e453aef2a43fbe164d37d37 (patch)
tree3ae4e2b788d35670a1d2c7284988824aea65f15e
parentfeff85e807c07a11794da2ad4d5a4d8a0368dbfd (diff)
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> (cherry picked from commit b5af0a26da84b75376706a92c7a58036a0bf3541)
-rw-r--r--drivers/hwtracing/coresight/coresight-etb10.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 2461d5c8c157..b0d402dbfeae 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -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.