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path: root/drivers/video/fbdev/hyperv_fb.c
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Diffstat (limited to 'drivers/video/fbdev/hyperv_fb.c')
-rw-r--r--drivers/video/fbdev/hyperv_fb.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
index 072ce07ba9e0..3ce746a46179 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -780,12 +780,18 @@ static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,
static int hvfb_on_panic(struct notifier_block *nb,
unsigned long e, void *p)
{
+ struct hv_device *hdev;
struct hvfb_par *par;
struct fb_info *info;
par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
- par->synchronous_fb = true;
info = par->info;
+ hdev = device_to_hv_device(info->device);
+
+ if (hv_ringbuffer_spinlock_busy(hdev->channel))
+ return NOTIFY_DONE;
+
+ par->synchronous_fb = true;
if (par->need_docopy)
hvfb_docopy(par, 0, dio_fb_size);
synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
@@ -1208,7 +1214,15 @@ static int hvfb_probe(struct hv_device *hdev,
par->fb_ready = true;
par->synchronous_fb = false;
+
+ /*
+ * We need to be sure this panic notifier runs _before_ the
+ * vmbus disconnect, so order it by priority. It must execute
+ * before the function hv_panic_vmbus_unload() [drivers/hv/vmbus_drv.c],
+ * which is almost at the end of list, with priority = INT_MIN + 1.
+ */
par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
+ par->hvfb_panic_nb.priority = INT_MIN + 10,
atomic_notifier_chain_register(&panic_notifier_list,
&par->hvfb_panic_nb);