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drm: bridge: anx7625: Fix NULL pointer dereference with early IRQ

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If the interrupt occurs before resource initialization is complete, the
interrupt handler/worker may access uninitialized data such as the I2C
tcpc_client device, potentially leading to NULL pointer dereference.

Signed-off-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
Fixes: 8bdfc5dae4 ("drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250709085438.56188-1-loic.poulain@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Loic Poulain 2025-07-09 10:54:38 +02:00 committed by Dmitry Baryshkov
parent 07c24945ca
commit a10f910c77
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/bridge/analogix/anx7625.c
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@ -2677,7 +2677,7 @@ static int anx7625_i2c_probe(struct i2c_client *client)
ret = devm_request_threaded_irq(dev, platform->pdata.intp_irq,
NULL, anx7625_intr_hpd_isr,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
IRQF_ONESHOT | IRQF_NO_AUTOEN,
"anx7625-intp", platform);
if (ret) {
DRM_DEV_ERROR(dev, "fail to request irq\n");
@ -2746,8 +2746,10 @@ static int anx7625_i2c_probe(struct i2c_client *client)
}
/* Add work function */
if (platform->pdata.intp_irq)
if (platform->pdata.intp_irq) {
enable_irq(platform->pdata.intp_irq);
queue_work(platform->workqueue, &platform->work);
}
if (platform->pdata.audio_en)
anx7625_register_audio(dev, platform);