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staging: drm/imx: fix pageflip events during device close 

During a device close the drm core frees all pending events in
drm_events_release(). If at that time a pageflip is pending the
interrupt handler will try to complete the now unitialized
event resulting in a NULL pointer exception. Seen on imx-drm
when userspace is killed during a page flip.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
wifi-calibration
Sascha Hauer 2013-10-10 16:18:44 +02:00 committed by Greg Kroah-Hartman
parent b8fbb34181
commit 6ee4d7fe1b
2 changed files with 15 additions and 7 deletions
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13
drivers/staging/imx-drm/imx-drm-core.c
View File

@ -185,6 +185,18 @@ static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
}
static void imx_drm_driver_preclose(struct drm_device *drm,
struct drm_file *file)
{
int i;
if (!file->is_master)
return;
for (i = 0; i < 4; i++)
imx_drm_disable_vblank(drm , i);
}
static const struct file_operations imx_drm_driver_fops = {
.owner = THIS_MODULE,
.open = drm_open,
@ -766,6 +778,7 @@ static struct drm_driver imx_drm_driver = {
.load = imx_drm_driver_load,
.unload = imx_drm_driver_unload,
.lastclose = imx_drm_driver_lastclose,
.preclose = imx_drm_driver_preclose,
.gem_free_object = drm_gem_cma_free_object,
.gem_vm_ops = &drm_gem_cma_vm_ops,
.dumb_create = drm_gem_cma_dumb_create,

9
drivers/staging/imx-drm/ipuv3-crtc.c
View File

@ -368,10 +368,6 @@ static struct drm_crtc_helper_funcs ipu_helper_funcs = {
static int ipu_enable_vblank(struct drm_crtc *crtc)
{
struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
enable_irq(ipu_crtc->irq);
return 0;
}
@ -379,7 +375,8 @@ static void ipu_disable_vblank(struct drm_crtc *crtc)
{
struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
disable_irq(ipu_crtc->irq);
ipu_crtc->page_flip_event = NULL;
ipu_crtc->newfb = NULL;
}
static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
@ -502,8 +499,6 @@ static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
goto err_put_resources;
}
disable_irq(ipu_crtc->irq);
return 0;
err_put_resources: