On Tue, 30 Apr 2024, R Sundar wrote:
> On 30/04/24 00:10, Christophe JAILLET wrote:
> > Le 29/04/2024 à 19:15, R Sundar a écrit :
> > > Use the new cleanup magic to replace of_node_put() with
> > > __free(device_node) marking to auto release when they get out of scope.
> > >
> > > Suggested-by: Julia Lawall <julia.lawall@xxxxxxxx>
> > > Signed-off-by: R Sundar <prosunofficial@xxxxxxxxx>
> > > ---
> > > drivers/media/platform/cadence/cdns-csi2tx.c | 19 +++++++------------
> > > 1 file changed, 7 insertions(+), 12 deletions(-)
> > >
> > > diff --git a/drivers/media/platform/cadence/cdns-csi2tx.c
> > > b/drivers/media/platform/cadence/cdns-csi2tx.c
> > > index 3d98f91f1bee..88aed2f299fd 100644
> > > --- a/drivers/media/platform/cadence/cdns-csi2tx.c
> > > +++ b/drivers/media/platform/cadence/cdns-csi2tx.c
> > > @@ -496,48 +496,43 @@ static int csi2tx_get_resources(struct csi2tx_priv
> > > *csi2tx,
> > > static int csi2tx_check_lanes(struct csi2tx_priv *csi2tx)
> > > {
> > > struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = 0 };
> > > - struct device_node *ep;
> > > int ret, i;
> > > -
> > > - ep = of_graph_get_endpoint_by_regs(csi2tx->dev->of_node, 0, 0);
> > > + struct device_node *ep __free(device_node) =
> > > + of_graph_get_endpoint_by_regs(csi2tx->dev->of_node, 0, 0);
> > > +
> > > if (!ep)
> > > return -EINVAL;
> > > ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &v4l2_ep);
> > > if (ret) {
> > > dev_err(csi2tx->dev, "Could not parse v4l2 endpoint\n");
> > > - goto out;
> > > + return ret;
> > > }
> > > if (v4l2_ep.bus_type != V4L2_MBUS_CSI2_DPHY) {
> > > dev_err(csi2tx->dev, "Unsupported media bus type: 0x%x\n",
> > > v4l2_ep.bus_type);
> > > - ret = -EINVAL;
> > > - goto out;
> > > + return -EINVAL;
> > > }
> > > csi2tx->num_lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
> > > if (csi2tx->num_lanes > csi2tx->max_lanes) {
> > > dev_err(csi2tx->dev,
> > > "Current configuration uses more lanes than supported\n");
> > > - ret = -EINVAL;
> > > - goto out;
> > > + return -EINVAL;
> > > }
> > > for (i = 0; i < csi2tx->num_lanes; i++) {
> > > if (v4l2_ep.bus.mipi_csi2.data_lanes[i] < 1) {
> > > dev_err(csi2tx->dev, "Invalid lane[%d] number: %u\n",
> > > i, v4l2_ep.bus.mipi_csi2.data_lanes[i]);
> > > - ret = -EINVAL;
> > > - goto out;
> > > + return -EINVAL;
> > > }
> > > }
> > > memcpy(csi2tx->lanes, v4l2_ep.bus.mipi_csi2.data_lanes,
> > > sizeof(csi2tx->lanes));
> > > -out:
> > > - of_node_put(ep);
> > > return ret;
> >
> > Hi,
> >
> > Nit: return 0; ?
> >
> > CJ
> >
> > > }
> >
> Hi,
>
> In success case, ret variable value also will be zero, else for non-zero ret
> value it will return from v4l2_fwnode_endpoint_parse()'s error case handling
> block.
Indeed, but it seems that the return ret at the end of the function always
returns 0? If that is the case, return 0 would be better, as one can see
that that code is only reached in the success case.
julia
