diff options
Diffstat (limited to 'drivers/video/fbdev/hyperv_fb.c')
| -rw-r--r-- | drivers/video/fbdev/hyperv_fb.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c index 072ce07ba9e0..fdbf02b42723 100644 --- a/drivers/video/fbdev/hyperv_fb.c +++ b/drivers/video/fbdev/hyperv_fb.c @@ -59,7 +59,6 @@ #include <linux/hyperv.h> - /* Hyper-V Synthetic Video Protocol definitions and structures */ #define MAX_VMBUS_PKT_SIZE 0x4000 @@ -780,12 +779,18 @@ 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 +1213,15 @@ 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); @@ -1363,6 +1376,9 @@ static int __init hvfb_drv_init(void) { int ret; + if (fb_modesetting_disabled("hyper_fb")) + return -ENODEV; + ret = vmbus_driver_register(&hvfb_drv); if (ret != 0) return ret; |