PCI: endpoint: test: Synchronously cancel command handler work

Use cancel_delayed_work_sync() in pci_epf_test_epc_deinit() to ensure
that the command handler is really stopped before proceeding with DMA
and BAR cleanup.

The same change is also done in pci_epf_test_link_down() to ensure that
the link down handling completes with the command handler fully stopped.

Link: https://lore.kernel.org/r/20241017010648.189889-1-dlemoal@kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>

Author: damien-lemoal

drivers/pci/endpoint/functions/pci-epf-test.c

@@ -800,7 +800,7 @@ static void pci_epf_test_epc_deinit(struct pci_epf *epf)
 {
 	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
 
-	cancel_delayed_work(&epf_test->cmd_handler);
+	cancel_delayed_work_sync(&epf_test->cmd_handler);
 	pci_epf_test_clean_dma_chan(epf_test);
 	pci_epf_test_clear_bar(epf);
 }
@@ -931,7 +931,7 @@ static void pci_epf_test_unbind(struct pci_epf *epf)
 	struct pci_epf_test *epf_test = epf_get_drvdata(epf);
 	struct pci_epc *epc = epf->epc;
 
-	cancel_delayed_work(&epf_test->cmd_handler);
+	cancel_delayed_work_sync(&epf_test->cmd_handler);
 	if (epc->init_complete) {
 		pci_epf_test_clean_dma_chan(epf_test);
 		pci_epf_test_clear_bar(epf);