From: Vinod Polimera <quic_vpolimer@quicinc.com>
To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
freedreno@lists.freedesktop.org, devicetree@vger.kernel.org
Cc: Vinod Polimera <quic_vpolimer@quicinc.com>,
linux-kernel@vger.kernel.org, robdclark@gmail.com,
dmitry.baryshkov@linaro.org, dianders@chromium.org,
quic_kalyant@quicinc.com
Subject: [PATCH] drm/msm/disp/dpu1: avoid clearing hw interrupts if hw_intr is null during drm uninit
Date: Tue, 26 Apr 2022 11:32:11 +0530 [thread overview]
Message-ID: <1650952931-31988-1-git-send-email-quic_vpolimer@quicinc.com> (raw)
Avoid clearing irqs and derefernce hw_intr when hw_intr is null.
BUG: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Call trace:
dpu_core_irq_uninstall+0x50/0xb0
dpu_irq_uninstall+0x18/0x24
msm_drm_uninit+0xd8/0x16c
msm_drm_bind+0x580/0x5fc
try_to_bring_up_master+0x168/0x1c0
__component_add+0xb4/0x178
component_add+0x1c/0x28
dp_display_probe+0x38c/0x400
platform_probe+0xb0/0xd0
really_probe+0xcc/0x2c8
__driver_probe_device+0xbc/0xe8
driver_probe_device+0x48/0xf0
__device_attach_driver+0xa0/0xc8
bus_for_each_drv+0x8c/0xd8
__device_attach+0xc4/0x150
device_initial_probe+0x1c/0x28
Fixes: a73033619ea ("drm/msm/dpu: squash dpu_core_irq into dpu_hw_interrupts")
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
index c515b7c..ab28577 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
@@ -599,6 +599,9 @@ void dpu_core_irq_uninstall(struct dpu_kms *dpu_kms)
{
int i;
+ if (!dpu_kms->hw_intr)
+ return;
+
pm_runtime_get_sync(&dpu_kms->pdev->dev);
for (i = 0; i < dpu_kms->hw_intr->total_irqs; i++)
if (!list_empty(&dpu_kms->hw_intr->irq_cb_tbl[i]))
--
2.7.4
next reply other threads:[~2022-04-26 6:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-26 6:02 Vinod Polimera [this message]
2022-04-26 21:50 ` [PATCH] drm/msm/disp/dpu1: avoid clearing hw interrupts if hw_intr is null during drm uninit Stephen Boyd
2022-04-27 10:53 ` Dmitry Baryshkov
2022-05-02 1:38 ` [Freedreno] " Abhinav Kumar
2022-05-02 8:05 ` Dmitry Baryshkov
2022-05-02 16:10 ` Abhinav Kumar
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