[PATCH] drm/radeon: check the alloc_workqueue return value in radeon_crtc_init()

[Yang Yingliang]

From: Yang Yingliang <yangyingli...@huawei.com>

check the alloc_workqueue return value in radeon_crtc_init()
to avoid null-ptr-deref.

Fixes: fa7f517cb26e ("drm/radeon: rework page flip handling v4")
Signed-off-by: Yang Yingliang <yangyingli...@huawei.com>
---
 drivers/gpu/drm/radeon/radeon_display.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c 
b/drivers/gpu/drm/radeon/radeon_display.c
index 901e75ec70ff..efd18c8d84c8 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -687,11 +687,16 @@ static void radeon_crtc_init(struct drm_device *dev, int 
index)
        if (radeon_crtc == NULL)
                return;
 
+       radeon_crtc->flip_queue = alloc_workqueue("radeon-crtc", WQ_HIGHPRI, 0);
+       if (!radeon_crtc->flip_queue) {
+               kfree(radeon_crtc);
+               return;
+       }
+
        drm_crtc_init(dev, &radeon_crtc->base, &radeon_crtc_funcs);
 
        drm_mode_crtc_set_gamma_size(&radeon_crtc->base, 256);
        radeon_crtc->crtc_id = index;
-       radeon_crtc->flip_queue = alloc_workqueue("radeon-crtc", WQ_HIGHPRI, 0);
        rdev->mode_info.crtcs[index] = radeon_crtc;
 
        if (rdev->family >= CHIP_BONAIRE) {
-- 
2.25.1