coresight: Fix check in coresight_tmc_etr_buf_insert_barrier_packet

We request for "CORESIGHT_BARRIER_PKT_SIZE" length and we should
be happy when we get that size.

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>

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 3556d9a..8af4512 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -807,7 +807,7 @@ tmc_etr_buf_insert_barrier_packet(struct etr_buf *etr_buf, u64 offset)
 
        len = tmc_etr_buf_get_data(etr_buf, offset,
                                   CORESIGHT_BARRIER_PKT_SIZE, &bufp);
-       if (WARN_ON(len <= CORESIGHT_BARRIER_PKT_SIZE))
+       if (WARN_ON(len < CORESIGHT_BARRIER_PKT_SIZE))
                return -EINVAL;
        coresight_insert_barrier_packet(bufp);
        return offset + CORESIGHT_BARRIER_PKT_SIZE;