| Message ID | 20191018141750.17032-1-georgi.djakov@linaro.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | interconnect: Add locking in icc_set_tag() | expand |
On Fri 18 Oct 07:17 PDT 2019, Georgi Djakov wrote: > 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> Reviewed-by: Bjorn Andersson <bjorn.andersson@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); >
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);
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(+)