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| author |   Mathieu Poirier <mathieu.poirier@linaro.org> | 2019-04-25 13:53:05 -0600 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-25 22:00:18 +0200 |
| commit | 57549999b9a0d0c72900d2413ef1e3168bd2e817 (patch) | |
| tree | e4ddd36976b85826122166c2837a7f20a9bb49c5 /drivers/hwtracing/coresight/coresight-tmc-etr.c | |
| parent | coresight: tmc-etr: Introduce the notion of process ID to ETR devices (diff) | |
| download | linux-dev-57549999b9a0d0c72900d2413ef1e3168bd2e817.tar.xz linux-dev-57549999b9a0d0c72900d2413ef1e3168bd2e817.zip | |
coresight: tmc-etr: Introduce the notion of reference counting to ETR devices
This patch adds reference counting to struct etr_buf so that, in CPU-wide
trace scenarios, shared buffers can be disposed of when no longer used.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tmc-etr.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc-etr.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 1acad42184e6..de33c0391186 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -8,6 +8,7 @@ #include <linux/coresight.h> #include <linux/dma-mapping.h> #include <linux/iommu.h> +#include <linux/refcount.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/vmalloc.h> @@ -1222,7 +1223,11 @@ get_perf_etr_buf_per_thread(struct tmc_drvdata *drvdata, * with memory allocation. */ etr_buf = alloc_etr_buf(drvdata, event, nr_pages, pages, snapshot); + if (IS_ERR(etr_buf)) + goto out; + refcount_set(&etr_buf->refcount, 1); +out: return etr_buf; } |