From: Georgi Djakov <georgi.djakov@linaro.org>
To: linux-pm@vger.kernel.org, evgreen@chromium.org, daidavid1@codeaurora.org
Cc: vincent.guittot@linaro.org, bjorn.andersson@linaro.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
Georgi Djakov <georgi.djakov@linaro.org>
Subject: [PATCH] interconnect: Add locking in icc_set_tag()
Date: Fri, 18 Oct 2019 17:17:50 +0300 [thread overview]
Message-ID: <20191018141750.17032-1-georgi.djakov@linaro.org> (raw)
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.djakov@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);
next reply other threads:[~2019-10-18 14:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 14:17 Georgi Djakov [this message]
2019-10-18 16:49 ` [PATCH] interconnect: Add locking in icc_set_tag() Bjorn Andersson
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