staging: imx/drm: request irq only after adding the crtc

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If the bootloader already enabled the display, the interrupt handler
will be called as soon as it is registered. If the CRTC is not already
added at this time, the call to imx_drm_handle_vblank will result in
a NULL pointer dereference.

The patch fixes a kernel panic [1], which has been on linux-next since
Jan 8 [2].

[1] http://thread.gmane.org/gmane.linux.ports.arm.kernel/218858
[2] http://thread.gmane.org/gmane.linux.ports.arm.kernel/208192

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Philipp Zabel 2013-02-20 10:57:01 +08:00 • committed by Greg Kroah-Hartman

parent 161f440c8d

commit 47b1be5c0f

1 changed files with 12 additions and 11 deletions

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drivers/staging/imx-drm/ipuv3-crtc.c

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