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interconnect: Add locking in icc_set_tag()

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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.

Link: https://lore.kernel.org/lkml/20191018141750.17032-1-georgi.djakov@linaro.org/
Fixes: 127ab2cc5f ("interconnect: Add support for path tags")
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
This commit is contained in:
Georgi Djakov 2019-10-18 17:17:50 +03:00
parent 83c774f0c6
commit a8dfe193a6
1 changed files with 4 additions and 0 deletions
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4
drivers/interconnect/core.c
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@ -405,8 +405,12 @@ 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);