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authorGerd Hoffmann <kraxel@redhat.com>2021-02-17 15:32:06 +0300
committerMaarten Lankhorst <maarten.lankhorst@linux.intel.com>2021-03-11 13:11:22 +0300
commite998d3c8cba93ab4075d6bcc56b1d4451d85efe5 (patch)
tree6ba897a204b902b9fae83df22b65dead8fb739c6 /drivers/gpu/drm/qxl
parente8dd3506dcf380d4cbe983422dfed1909011b02a (diff)
downloadlinux-e998d3c8cba93ab4075d6bcc56b1d4451d85efe5.tar.xz
drm/qxl: fix lockdep issue in qxl_alloc_release_reserved
Call qxl_bo_unpin (which does a reservation) without holding the release_mutex lock. Fixes lockdep (correctly) warning on a possible deadlock. Fixes: e8dd3506dcf3 ("drm/qxl: unpin release objects") Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Link: http://patchwork.freedesktop.org/patch/msgid/20210217123213.2199186-5-kraxel@redhat.com (cherry picked from commit 19089b760e56c97458c272e90e43da761b05cf12) Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/qxl')
-rw-r--r--drivers/gpu/drm/qxl/qxl_release.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 93b5f7ab055d..b372455e2729 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -321,7 +321,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
int type, struct qxl_release **release,
struct qxl_bo **rbo)
{
- struct qxl_bo *bo;
+ struct qxl_bo *bo, *free_bo = NULL;
int idr_ret;
int ret = 0;
union qxl_release_info *info;
@@ -347,8 +347,7 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
mutex_lock(&qdev->release_mutex);
if (qdev->current_release_bo_offset[cur_idx] + 1 >= releases_per_bo[cur_idx]) {
- qxl_bo_unpin(qdev->current_release_bo[cur_idx]);
- qxl_bo_unref(&qdev->current_release_bo[cur_idx]);
+ free_bo = qdev->current_release_bo[cur_idx];
qdev->current_release_bo_offset[cur_idx] = 0;
qdev->current_release_bo[cur_idx] = NULL;
}
@@ -356,6 +355,10 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
ret = qxl_release_bo_alloc(qdev, &qdev->current_release_bo[cur_idx]);
if (ret) {
mutex_unlock(&qdev->release_mutex);
+ if (free_bo) {
+ qxl_bo_unpin(free_bo);
+ qxl_bo_unref(&free_bo);
+ }
qxl_release_free(qdev, *release);
return ret;
}
@@ -371,6 +374,10 @@ int qxl_alloc_release_reserved(struct qxl_device *qdev, unsigned long size,
*rbo = bo;
mutex_unlock(&qdev->release_mutex);
+ if (free_bo) {
+ qxl_bo_unpin(free_bo);
+ qxl_bo_unref(&free_bo);
+ }
ret = qxl_release_list_add(*release, bo);
qxl_bo_unref(&bo);