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Wed, 20 Nov 2019 07:14:05 +0000 From: Dexuan Cui To: kys@microsoft.com, haiyangz@microsoft.com, 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, mikelley@microsoft.com, Alexander.Levin@microsoft.com Cc: weh@microsoft.com, Dexuan Cui Subject: [PATCH] video: hyperv_fb: Fix hibernation for the deferred IO feature Date: Tue, 19 Nov 2019 23:13:48 -0800 Message-Id: <1574234028-48574-1-git-send-email-decui@microsoft.com> X-Mailer: git-send-email 1.8.3.1 Reply-To: decui@microsoft.com Content-Type: text/plain X-ClientProxiedBy: MWHPR1001CA0019.namprd10.prod.outlook.com (2603:10b6:301:2a::32) To BN8PR21MB1137.namprd21.prod.outlook.com (2603:10b6:408:71::32) MIME-Version: 1.0 Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (13.77.154.182) by MWHPR1001CA0019.namprd10.prod.outlook.com (2603:10b6:301:2a::32) with Microsoft SMTP Server (version=TLS1_2, cipher=) via Frontend Transport; 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Received-SPF: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: bhK2dSNKGGYPc6e53IRI99ioTy/zaMDzStkmpjIVmnRE3Ps+SZTe08LZByFbdtGm0/bdp4AXKku1vCxfQTzBpiSFFZxfA7RBdFNVgWqpw2F7hr6K834Xcl79Dddprx+8ksawTlipejcd0j3hfHD5I4wW0w2dBTK+TxiPnnZGM9mtWg9AQ1n2687CuLm5pQYkRciWQoRWRCkkuSlMhYHwKiPV63dRi4BCKSQmEeJv3wlPsiqXLdKjJGDyqYA4d9Dd0aj9DJ0qqU3Jfe7uHdXCU7YVXtKZLgSHx+naznXUXOPHWvzm9ZvKUf8WrXhwyur63hZMUjWjDIWhy4cvMx+MmKicW0yqBXcziM7+OGV6H4RpYoe85KALfkavJzp6kRhcjl5FGMReHNpaK2tqbVsq56s1zJPzJEioJRxnVFQ37DuoKLPTRPOkYAuw5M9wEDkwSOJ6M1ZdE3gnHk2Vch02holbzrUORAnzNDiseNtNVLQ= X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 451143ff-78f0-4401-d96f-08d76d893a84 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Nov 2019 07:14:05.8958 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: cef0C17Jcp7ONq0+MijjLeilYGW4g0sAQ3fdpHiBR3Tfhiw/pJ+d54nH+yTOe5/0CsvYuNkAz/u0bK7cGLBfsw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR21MB1251 Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org 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 --- This patch fixes the 2 aforementioned patches on Sasha Levin's Hyper-V tree's hyperv-next branch: https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/log/?h=hyperv-next 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