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: [email protected]
Fixes: 5f0c2ee ("bus: mhi: pci-generic: Fix hibernation")
Reported-by: Bhaumik Vasav Bhatt <[email protected]>
Reviewed-by: Bhaumik Vasav Bhatt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Manivannan Sadhasivam <[email protected]>

Author: Mani-Sadhasivam

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);