From: Neil Armstrong <narmstrong@baylibre.com>
To: dri-devel@lists.freedesktop.org
Cc: linux-amlogic@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Neil Armstrong <narmstrong@baylibre.com>,
Stefan Agner <stefan@agner.ch>
Subject: [PATCH] drm/meson: fix shutdown crash when component not probed
Date: Fri, 30 Apr 2021 10:27:44 +0200 [thread overview]
Message-ID: <20210430082744.3638743-1-narmstrong@baylibre.com> (raw)
When main component is not probed, by example when the dw-hdmi module is
not loaded yet or in probe defer, the following crash appears on shutdown:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000038
...
pc : meson_drv_shutdown+0x24/0x50
lr : platform_drv_shutdown+0x20/0x30
...
Call trace:
meson_drv_shutdown+0x24/0x50
platform_drv_shutdown+0x20/0x30
device_shutdown+0x158/0x360
kernel_restart_prepare+0x38/0x48
kernel_restart+0x18/0x68
__do_sys_reboot+0x224/0x250
__arm64_sys_reboot+0x24/0x30
...
Simply check if the priv struct has been allocated before using it.
Fixes: fa0c16caf3d7 ("drm: meson_drv add shutdown function")
Reported-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
drivers/gpu/drm/meson/meson_drv.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 453d8b4c5763..07fcd12dca16 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -485,11 +485,12 @@ static int meson_probe_remote(struct platform_device *pdev,
static void meson_drv_shutdown(struct platform_device *pdev)
{
struct meson_drm *priv = dev_get_drvdata(&pdev->dev);
- struct drm_device *drm = priv->drm;
- DRM_DEBUG_DRIVER("\n");
- drm_kms_helper_poll_fini(drm);
- drm_atomic_helper_shutdown(drm);
+ if (!priv)
+ return;
+
+ drm_kms_helper_poll_fini(priv->drm);
+ drm_atomic_helper_shutdown(priv->drm);
}
static int meson_drv_probe(struct platform_device *pdev)
--
2.25.1
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next reply other threads:[~2021-04-30 8:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-30 8:27 Neil Armstrong [this message]
2021-05-02 23:04 ` [PATCH] drm/meson: fix shutdown crash when component not probed Martin Blumenstingl
2021-05-20 20:25 ` Martin Blumenstingl
2021-05-25 7:19 ` Neil Armstrong
2021-05-25 7:27 ` Neil Armstrong
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