-----Original Message----- From: Dexuan Cui decui@microsoft.com Sent: Wednesday, November 20, 2019 3:14 PM To: KY Srinivasan kys@microsoft.com; Haiyang Zhang haiyangz@microsoft.com; Stephen Hemminger sthemmin@microsoft.com; sashal@kernel.org; b.zolnierkie@samsung.com; linux-hyperv@vger.kernel.org; dri-devel@lists.freedesktop.org; linux-fbdev@vger.kernel.org; linux- kernel@vger.kernel.org; Michael Kelley mikelley@microsoft.com; Sasha Levin Alexander.Levin@microsoft.com Cc: Wei Hu weh@microsoft.com; Dexuan Cui decui@microsoft.com Subject: [PATCH] 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
This patch fixes the 2 aforementioned patches on Sasha Levin's Hyper-V tree's hyperv-next branch: https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kern el.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Fhyperv%2Flinux.git%2Flog %2F%3Fh%3Dhyperv- next&data=02%7C01%7Cweh%40microsoft.com%7C451143ff78f04401d9 6f08d76d893a84%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637 098308493217121&sdata=P2fo%2F1TJUMIj5FtJCOp2QwDrghhVfPSCEJ4f1 vkOXvI%3D&reserved=0
The 2 aforementioned patches have not appeared in the mainline yet, so please pick up this patch onto he same hyperv-next branch.
drivers/video/fbdev/hyperv_fb.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c index 4cd27e5172a1..08bc0dfb5ce7 100644 --- a/drivers/video/fbdev/hyperv_fb.c +++ b/drivers/video/fbdev/hyperv_fb.c @@ -1194,6 +1194,7 @@ static int hvfb_suspend(struct hv_device *hdev) fb_set_suspend(info, 1);
cancel_delayed_work_sync(&par->dwork);
cancel_delayed_work_sync(&info->deferred_work);
par->update_saved = par->update; par->update = false;
@@ -1227,6 +1228,7 @@ static int hvfb_resume(struct hv_device *hdev) par->fb_ready = true; par->update = par->update_saved;
schedule_delayed_work(&info->deferred_work, info->fbdefio->delay); schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
/* 0 means do resume */
-- 2.19.1
Signed-off-by: Wei Hu weh@microsoft.com