linux-kernel - [PATCH v2 01/11] drm/qxl: properly handle device init failures

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Date:   Wed, 17 Feb 2021 13:32:03 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        Tong Zhang <ztong0001@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org (open list:DRM DRIVER FOR QXL
        VIRTUAL GPU),
        spice-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR QXL VIRTUAL
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 01/11] drm/qxl: properly handle device init failures

Specifically do not try release resources which where
not allocated in the first place.

Cc: Tong Zhang <ztong0001@...il.com>
Tested-by: Tong Zhang <ztong0001@...il.com>
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 drivers/gpu/drm/qxl/qxl_display.c | 3 +++
 drivers/gpu/drm/qxl/qxl_kms.c     | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index c326412136c5..ec50d2cfd4e1 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -1183,6 +1183,9 @@ int qxl_destroy_monitors_object(struct qxl_device *qdev)
 {
 	int ret;
 
+	if (!qdev->monitors_config_bo)
+		return 0;
+
 	qdev->monitors_config = NULL;
 	qdev->ram_header->monitors_config = 0;
 
diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index 66d74aaaee06..4dc5ad13f12c 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -288,6 +288,10 @@ void qxl_device_fini(struct qxl_device *qdev)
 {
 	int cur_idx;
 
+	/* check if qxl_device_init() was successful (gc_work is initialized last) */
+	if (!qdev->gc_work.func)
+		return;
+
 	for (cur_idx = 0; cur_idx < 3; cur_idx++) {
 		if (!qdev->current_release_bo[cur_idx])
 			continue;
-- 
2.29.2