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drm: adv7511: Fix crash in IRQ handler when no encoder is associated

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The ADV7511 is probed before its slave encoder init function associates
it with an encoder. This creates a time window during which hot plug
detection interrupts can occur with an encoder, resulting in a crash in
the IRQ handler.

Fix this by ignoring hot plug detection IRQs when no encoder is
associated yet.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
This commit is contained in:
Laurent Pinchart 2015-05-14 00:31:07 +03:00
parent bdcddf95e8
commit a1d0503d26
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i2c/adv7511.c
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@ -438,7 +438,7 @@ static int adv7511_irq_process(struct adv7511 *adv7511)
regmap_write(adv7511->regmap, ADV7511_REG_INT(0), irq0);
regmap_write(adv7511->regmap, ADV7511_REG_INT(1), irq1);
if (irq0 & ADV7511_INT0_HDP)
if (irq0 & ADV7511_INT0_HDP && adv7511->encoder)
drm_helper_hpd_irq_event(adv7511->encoder->dev);
if (irq0 & ADV7511_INT0_EDID_READY || irq1 & ADV7511_INT1_DDC_ERROR) {