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Mon, 27 Jul 2026 07:21:02 -0700 (PDT) Message-ID: <20260727222056.26262.alvinhuang0603@gmail.com> Date: Mon, 27 Jul 2026 22:20:56 +0800 To: Luca Ceresoli , Thierry Reding , Jonathan Hunter , Sowjanya Komatineni Cc: Mauro Carvalho Chehab , Hans Verkuil , Greg Kroah-Hartman , linux-media@vger.kernel.org, linux-tegra@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Hao-Qun Huang Subject: [PATCH] staging: media: tegra-video: vi: move port parsing into a subfunction tegra_vi_channels_alloc() needs two error variables because its loop body mixes two things: ports that are skipped because they cannot be used, and errors that have to stop the whole allocation. Move the loop body into tegra_vi_port_channel_alloc(), which returns 0 both when the port is skipped and when a channel was allocated, and a negative error only when allocation must stop. The loop is then a call and an error check, and the second error variable is no longer needed. No functional change intended. Suggested-by: Luca Ceresoli Assisted-by: Claude:claude-fable-5 Signed-off-by: Hao-Qun Huang --- This is the cleanup on top of "staging: media: tegra-video: vi: fix probe failure on skipped last port", already in media.git/next, so it needs that one applied first. drivers/staging/media/tegra-video/vi.c | 92 ++++++++++++++------------ 1 file changed, 49 insertions(+), 43 deletions(-) diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c index f461e117305e..09eac34a7813 100644 --- a/drivers/staging/media/tegra-video/vi.c +++ b/drivers/staging/media/tegra-video/vi.c @@ -1247,17 +1247,54 @@ static int tegra_vi_tpg_channels_alloc(struct tegra_vi *vi) return 0; } +static int tegra_vi_port_channel_alloc(struct tegra_vi *vi, + struct device_node *port) +{ + struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = 0 }; + struct device_node *parent; + struct device_node *ep; + unsigned int port_num; + unsigned int lanes; + int ret; + + if (!of_node_name_eq(port, "port")) + return 0; + + if (of_property_read_u32(port, "reg", &port_num) < 0) + return 0; + + if (port_num > vi->soc->vi_max_channels) { + dev_err(vi->dev, "invalid port num %d for %pOF\n", + port_num, port); + return -EINVAL; + } + + ep = of_get_child_by_name(port, "endpoint"); + if (!ep) + return 0; + + parent = of_graph_get_remote_port_parent(ep); + of_node_put(ep); + if (!parent) + return 0; + + ep = of_graph_get_endpoint_by_regs(parent, 0, 0); + of_node_put(parent); + ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &v4l2_ep); + of_node_put(ep); + if (ret) + return 0; + + lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes; + + return tegra_vi_channel_alloc(vi, port_num, port, lanes); +} + static int tegra_vi_channels_alloc(struct tegra_vi *vi) { struct device_node *node = vi->dev->of_node; - struct device_node *ep = NULL; struct device_node *ports; - struct device_node *port = NULL; - unsigned int port_num; - struct device_node *parent; - struct v4l2_fwnode_endpoint v4l2_ep = { .bus_type = 0 }; - unsigned int lanes; - int err; + struct device_node *port; int ret = 0; ports = of_get_child_by_name(node, "ports"); @@ -1265,46 +1302,15 @@ static int tegra_vi_channels_alloc(struct tegra_vi *vi) return dev_err_probe(vi->dev, -ENODEV, "%pOF: missing 'ports' node\n", node); for_each_child_of_node(ports, port) { - if (!of_node_name_eq(port, "port")) - continue; - - err = of_property_read_u32(port, "reg", &port_num); - if (err < 0) - continue; - - if (port_num > vi->soc->vi_max_channels) { - dev_err(vi->dev, "invalid port num %d for %pOF\n", - port_num, port); - ret = -EINVAL; - goto cleanup; + ret = tegra_vi_port_channel_alloc(vi, port); + if (ret) { + of_node_put(port); + break; } - - ep = of_get_child_by_name(port, "endpoint"); - if (!ep) - continue; - - parent = of_graph_get_remote_port_parent(ep); - of_node_put(ep); - if (!parent) - continue; - - ep = of_graph_get_endpoint_by_regs(parent, 0, 0); - of_node_put(parent); - err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), - &v4l2_ep); - of_node_put(ep); - if (err) - continue; - - lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes; - ret = tegra_vi_channel_alloc(vi, port_num, port, lanes); - if (ret < 0) - goto cleanup; } -cleanup: - of_node_put(port); of_node_put(ports); + return ret; } -- 2.43.0