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drm/qxl: Call qxl_bo_unref outside atomic context 

"qxl_bo_unref" may sleep, but calling "qxl_release_map" causes
"preempt_disable()" to be called and "preempt_enable()" isn't called
until "qxl_release_unmap" is used. Move the call to "qxl_bo_unref" out
from in between the two to avoid sleeping from an atomic context.

This issue can be demonstrated on a kernel with CONFIG_LOCKDEP=y by
creating a VM using QXL, using a desktop environment using Xorg, then
moving the cursor on or off a window.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1571128
Fixes: 9428088c90 ("drm/qxl: reapply cursor after resetting primary")
Cc: stable@vger.kernel.org
Signed-off-by: Jeremy Cline <jcline@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20180601200532.13619-1-jcline@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
zero-colors
Jeremy Cline 2018-06-01 16:05:32 -04:00 committed by Gerd Hoffmann
parent c32048d9e9
commit 889ad63d41
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/qxl/qxl_display.c
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@ -630,7 +630,7 @@ static void qxl_cursor_atomic_update(struct drm_plane *plane,
struct qxl_cursor_cmd *cmd;
struct qxl_cursor *cursor;
struct drm_gem_object *obj;
struct qxl_bo *cursor_bo = NULL, *user_bo = NULL;
struct qxl_bo *cursor_bo = NULL, *user_bo = NULL, *old_cursor_bo = NULL;
int ret;
void *user_ptr;
int size = 64*64*4;
@ -684,7 +684,7 @@ static void qxl_cursor_atomic_update(struct drm_plane *plane,
cursor_bo, 0);
cmd->type = QXL_CURSOR_SET;
qxl_bo_unref(&qcrtc->cursor_bo);
old_cursor_bo = qcrtc->cursor_bo;
qcrtc->cursor_bo = cursor_bo;
cursor_bo = NULL;
} else {
@ -704,6 +704,9 @@ static void qxl_cursor_atomic_update(struct drm_plane *plane,
qxl_push_cursor_ring_release(qdev, release, QXL_CMD_CURSOR, false);
qxl_release_fence_buffer_objects(release);
if (old_cursor_bo)
qxl_bo_unref(&old_cursor_bo);
qxl_bo_unref(&cursor_bo);
return;