[PATCH] interconnect: Add locking in icc_set_tag()

[Georgi Djakov]

We must ensure that the tag is not changed while we aggregate the
requests. Currently the icc_set_tag() is not using any locks and this
may cause the values to be aggregated incorrectly. Fix this by acquiring
the icc_lock while we set the tag.

Fixes: 127ab2cc5f19 ("interconnect: Add support for path tags")
Signed-off-by: Georgi Djakov <georgi.dja...@linaro.org>
---
 drivers/interconnect/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index e24092558c29..4940c0741d40 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -408,8 +408,12 @@ void icc_set_tag(struct icc_path *path, u32 tag)
        if (!path)
                return;
 
+       mutex_lock(&icc_lock);
+
        for (i = 0; i < path->num_nodes; i++)
                path->reqs[i].tag = tag;
+
+       mutex_unlock(&icc_lock);
 }
 EXPORT_SYMBOL_GPL(icc_set_tag);