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video: hyperv_fb: Fix hibernation for the deferred IO feature 

fb_deferred_io_work() can access the vmbus ringbuffer by calling
fbdefio->deferred_io() -> synthvid_deferred_io() -> synthvid_update().

Because the vmbus ringbuffer is inaccessible between hvfb_suspend()
and hvfb_resume(), we must cancel info->deferred_work before calling
vmbus_close() and then reschedule it after we reopen the channel
in hvfb_resume().

Fixes: a4ddb11d297e ("video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame buffer driver")
Fixes: 824946a8b6fb ("video: hyperv_fb: Add the support of hibernation")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Wei Hu <weh@microsoft.com>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dexuan Cui 2020-01-06 14:41:51 -08:00 committed by Sasha Levin
parent e2379b3032
commit 382a462217
1 changed files with 2 additions and 0 deletions
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2
drivers/video/fbdev/hyperv_fb.c
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@ -1194,6 +1194,7 @@ static int hvfb_suspend(struct hv_device *hdev)
fb_set_suspend(info, 1); fb_set_suspend(info, 1);
cancel_delayed_work_sync(&par->dwork); cancel_delayed_work_sync(&par->dwork);
cancel_delayed_work_sync(&info->deferred_work);
par->update_saved = par->update; par->update_saved = par->update;
par->update = false; par->update = false;
@ -1227,6 +1228,7 @@ static int hvfb_resume(struct hv_device *hdev)
par->fb_ready = true; par->fb_ready = true;
par->update = par->update_saved; par->update = par->update_saved;
schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
/* 0 means do resume */ /* 0 means do resume */