6.1-stable review patch. If anyone has any objections, please let me know.
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From: Stephen Boyd swboyd@chromium.org
[ Upstream commit 7b821db95140e2c118567aee22a78bf85f3617e0 ]
The kernel produces a warning splat and the DSI device fails to register in this driver if the i2c driver probes, populates child auxiliary devices, and then somewhere in ti_sn_bridge_probe() a function call returns -EPROBE_DEFER. When the auxiliary driver probe defers, the dsi device created by devm_mipi_dsi_device_register_full() is left registered because the devm managed device used to manage the lifetime of the DSI device is the parent i2c device, not the auxiliary device that is being probed.
Associate the DSI device created and managed by this driver to the lifetime of the auxiliary device, not the i2c device, so that the DSI device is removed when the auxiliary driver unbinds. Similarly change the device pointer used for dev_err_probe() so the deferred probe errors are associated with the auxiliary device instead of the parent i2c device so we can narrow down future problems faster.
Cc: Douglas Anderson dianders@chromium.org Cc: Maxime Ripard maxime@cerno.tech Fixes: c3b75d4734cb ("drm/bridge: sn65dsi86: Register and attach our DSI device at probe") Signed-off-by: Stephen Boyd swboyd@chromium.org Reviewed-by: Neil Armstrong neil.armstrong@linaro.org Reviewed-by: Douglas Anderson dianders@chromium.org Signed-off-by: Douglas Anderson dianders@chromium.org Link: https://patchwork.freedesktop.org/patch/msgid/20231002235407.769399-1-swboyd... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/bridge/ti-sn65dsi86.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index b89f7f7ca1885..1b5c27ed27370 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -673,7 +673,7 @@ static struct ti_sn65dsi86 *bridge_to_ti_sn65dsi86(struct drm_bridge *bridge) return container_of(bridge, struct ti_sn65dsi86, bridge); }
-static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata) +static int ti_sn_attach_host(struct auxiliary_device *adev, struct ti_sn65dsi86 *pdata) { int val; struct mipi_dsi_host *host; @@ -688,7 +688,7 @@ static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata) if (!host) return -EPROBE_DEFER;
- dsi = devm_mipi_dsi_device_register_full(dev, host, &info); + dsi = devm_mipi_dsi_device_register_full(&adev->dev, host, &info); if (IS_ERR(dsi)) return PTR_ERR(dsi);
@@ -706,7 +706,7 @@ static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata)
pdata->dsi = dsi;
- return devm_mipi_dsi_attach(dev, dsi); + return devm_mipi_dsi_attach(&adev->dev, dsi); }
static int ti_sn_bridge_attach(struct drm_bridge *bridge, @@ -1279,9 +1279,9 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev, struct device_node *np = pdata->dev->of_node; int ret;
- pdata->next_bridge = devm_drm_of_get_bridge(pdata->dev, np, 1, 0); + pdata->next_bridge = devm_drm_of_get_bridge(&adev->dev, np, 1, 0); if (IS_ERR(pdata->next_bridge)) - return dev_err_probe(pdata->dev, PTR_ERR(pdata->next_bridge), + return dev_err_probe(&adev->dev, PTR_ERR(pdata->next_bridge), "failed to create panel bridge\n");
ti_sn_bridge_parse_lanes(pdata, np); @@ -1300,9 +1300,9 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev,
drm_bridge_add(&pdata->bridge);
- ret = ti_sn_attach_host(pdata); + ret = ti_sn_attach_host(adev, pdata); if (ret) { - dev_err_probe(pdata->dev, ret, "failed to attach dsi host\n"); + dev_err_probe(&adev->dev, ret, "failed to attach dsi host\n"); goto err_remove_bridge; }