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8299d1f057
Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted patches, wireless patches and defconfig patches. bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 4B v1.1 4G bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
112 lines
3.6 KiB
Diff
112 lines
3.6 KiB
Diff
From fda46a52e84a5160d7277e55e1c1be376b0ba579 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Mon, 5 Jul 2021 17:31:48 +0200
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Subject: [PATCH] drm/vc4: hdmi: Drop devm interrupt handler for
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hotplug interrupts
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The hotplugs interrupt handlers are registered through the
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devm_request_threaded_irq function. However, while free_irq is indeed
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called properly when the device is unbound or bind fails, it's called
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after unbind or bind is done.
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In our particular case, it means that on failure it creates a window
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where our interrupt handler can be called, but we're freeing every
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resource (CEC adapter, DRM objects, etc.) it might need.
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In order to address this, let's switch to the non-devm variant to
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control better when the handler will be unregistered and allow us to
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make it safe.
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Fixes: f4790083c7c2 ("drm/vc4: hdmi: Rely on interrupts to handle hotplug")
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/gpu/drm/vc4/vc4_hdmi.c | 41 +++++++++++++++++++++++-----------
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1 file changed, 28 insertions(+), 13 deletions(-)
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--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
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+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
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@@ -1611,26 +1611,28 @@ static irqreturn_t vc4_hdmi_hpd_irq_thre
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static int vc4_hdmi_hotplug_init(struct vc4_hdmi *vc4_hdmi)
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{
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struct platform_device *pdev = vc4_hdmi->pdev;
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- struct device *dev = &pdev->dev;
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struct drm_connector *connector = &vc4_hdmi->connector;
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int ret;
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if (vc4_hdmi->variant->external_irq_controller) {
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- ret = devm_request_threaded_irq(dev,
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- platform_get_irq_byname(pdev, "hpd-connected"),
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- NULL,
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- vc4_hdmi_hpd_irq_thread, IRQF_ONESHOT,
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- "vc4 hdmi hpd connected", vc4_hdmi);
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+ unsigned int hpd_con = platform_get_irq_byname(pdev, "hpd-connected");
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+ unsigned int hpd_rm = platform_get_irq_byname(pdev, "hpd-removed");
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+
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+ ret = request_threaded_irq(hpd_con,
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+ NULL,
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+ vc4_hdmi_hpd_irq_thread, IRQF_ONESHOT,
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+ "vc4 hdmi hpd connected", vc4_hdmi);
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if (ret)
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return ret;
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- ret = devm_request_threaded_irq(dev,
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- platform_get_irq_byname(pdev, "hpd-removed"),
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- NULL,
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- vc4_hdmi_hpd_irq_thread, IRQF_ONESHOT,
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- "vc4 hdmi hpd disconnected", vc4_hdmi);
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- if (ret)
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+ ret = request_threaded_irq(hpd_rm,
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+ NULL,
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+ vc4_hdmi_hpd_irq_thread, IRQF_ONESHOT,
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+ "vc4 hdmi hpd disconnected", vc4_hdmi);
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+ if (ret) {
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+ free_irq(hpd_con, vc4_hdmi);
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return ret;
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+ }
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connector->polled = DRM_CONNECTOR_POLL_HPD;
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}
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@@ -1638,6 +1640,16 @@ static int vc4_hdmi_hotplug_init(struct
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return 0;
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}
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+static void vc4_hdmi_hotplug_exit(struct vc4_hdmi *vc4_hdmi)
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+{
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+ struct platform_device *pdev = vc4_hdmi->pdev;
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+
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+ if (vc4_hdmi->variant->external_irq_controller) {
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+ free_irq(platform_get_irq_byname(pdev, "hpd-connected"), vc4_hdmi);
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+ free_irq(platform_get_irq_byname(pdev, "hpd-removed"), vc4_hdmi);
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+ }
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+}
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+
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#ifdef CONFIG_DRM_VC4_HDMI_CEC
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static irqreturn_t vc4_cec_irq_handler_rx_thread(int irq, void *priv)
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{
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@@ -2299,7 +2311,7 @@ static int vc4_hdmi_bind(struct device *
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ret = vc4_hdmi_cec_init(vc4_hdmi);
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if (ret)
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- goto err_destroy_conn;
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+ goto err_free_hotplug;
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ret = vc4_hdmi_audio_init(vc4_hdmi);
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if (ret)
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@@ -2313,6 +2325,8 @@ static int vc4_hdmi_bind(struct device *
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err_free_cec:
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vc4_hdmi_cec_exit(vc4_hdmi);
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+err_free_hotplug:
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+ vc4_hdmi_hotplug_exit(vc4_hdmi);
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err_destroy_conn:
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vc4_hdmi_connector_destroy(&vc4_hdmi->connector);
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err_destroy_encoder:
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@@ -2354,6 +2368,7 @@ static void vc4_hdmi_unbind(struct devic
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kfree(vc4_hdmi->hd_regset.regs);
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vc4_hdmi_cec_exit(vc4_hdmi);
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+ vc4_hdmi_hotplug_exit(vc4_hdmi);
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vc4_hdmi_connector_destroy(&vc4_hdmi->connector);
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drm_encoder_cleanup(&vc4_hdmi->encoder.base.base);
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