linux-kernel - [PATCH v2] bus: mhi: host: pci_generic: Flush recovery worker during freeze

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Date:   Fri,  8 Apr 2022 20:30:39 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     mhi@...ts.linux.dev
Cc:     quic_hemantk@...cinc.com, quic_bbhatt@...cinc.com,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        loic.poulain@...aro.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        stable@...r.kernel.org
Subject: [PATCH v2] bus: mhi: host: pci_generic: Flush recovery worker during freeze

It is possible that the recovery work might be running while the freeze
gets executed (during hibernation etc.,). Currently, we don't powerdown
the stack if it is not up but if the recovery work completes after freeze,
then the device will be up afterwards. This will not be a sane situation.

So let's flush the recovery worker before trying to powerdown the device.

Cc: stable@...r.kernel.org
Fixes: 5f0c2ee1fe8d ("bus: mhi: pci-generic: Fix hibernation")
Reported-by: Bhaumik Vasav Bhatt <quic_bbhatt@...cinc.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---

Changes in v2:

* Switched to flush_work() as the workqueue used is global one.

 drivers/bus/mhi/host/pci_generic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
index ef85dbfb3216..541ced27d941 100644
--- a/drivers/bus/mhi/host/pci_generic.c
+++ b/drivers/bus/mhi/host/pci_generic.c
@@ -1060,6 +1060,7 @@ static int __maybe_unused mhi_pci_freeze(struct device *dev)
 	 * the intermediate restore kernel reinitializes MHI device with new
 	 * context.
 	 */
+	flush_work(&mhi_pdev->recovery_work);
 	if (test_and_clear_bit(MHI_PCI_DEV_STARTED, &mhi_pdev->status)) {
 		mhi_power_down(mhi_cntrl, true);
 		mhi_unprepare_after_power_down(mhi_cntrl);
-- 
2.25.1