Hi Sai, On Thu, Jun 20, 2019 at 07:15:46PM +0530, Sai Prakash Ranjan wrote: > Affinity defaults to CPU0 in case of missing CPU phandle > and this leads to crashes in some cases because of such > wrong assumption. Fix this by returning -ENODEV in > coresight platform for such cases and then handle it > in the coresight drivers. > > Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx> > --- > drivers/hwtracing/coresight/coresight-platform.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c > index 3c5ceda8db24..b1ea60c210e1 100644 > --- a/drivers/hwtracing/coresight/coresight-platform.c > +++ b/drivers/hwtracing/coresight/coresight-platform.c > @@ -160,15 +160,17 @@ static int of_coresight_get_cpu(struct device *dev) > > if (!dev->of_node) > return 0; An error should be returned if the above condition is true. > + Spurious newline > dn = of_parse_phandle(dev->of_node, "cpu", 0); > - /* Affinity defaults to CPU0 */ > + > + /* Affinity defaults to invalid if no cpu nodes are found*/ > if (!dn) > - return 0; > + return -ENODEV; > + > cpu = of_cpu_node_to_id(dn); > of_node_put(dn); > > - /* Affinity to CPU0 if no cpu nodes are found */ > - return (cpu < 0) ? 0 : cpu; > + return cpu; > } > > /* > -- > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member > of Code Aurora Forum, hosted by The Linux Foundation >
