PCI: endpoint: pci-epf-test: Don't free doorbell IRQ unless requested

[ Upstream commit e81fa70 ]

pci_epf_test_doorbell_cleanup() unconditionally calls free_irq() for the
doorbell virq, which can trigger "Trying to free already-free IRQ"
warnings when the IRQ was never requested or when request_threaded_irq()
failed.

Move free_irq() out of pci_epf_test_doorbell_cleanup() and invoke it
only after a successful request, so that free_irq() is not called for
an unrequested IRQ.

Fixes: eff0c28 ("PCI: endpoint: pci-epf-test: Add doorbell test support")
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Link: https://patch.msgid.link/20260217063856.3759713-3-den@valinux.co.jp
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Koichiro Den

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

@@ -715,7 +715,6 @@ static void pci_epf_test_doorbell_cleanup(struct pci_epf_test *epf_test)
 	struct pci_epf_test_reg *reg = epf_test->reg[epf_test->test_reg_bar];
 	struct pci_epf *epf = epf_test->epf;
 
-	free_irq(epf->db_msg[0].virq, epf_test);
 	reg->doorbell_bar = cpu_to_le32(NO_BAR);
 
 	pci_epf_free_doorbell(epf);
@@ -759,7 +758,7 @@ static void pci_epf_test_enable_doorbell(struct pci_epf_test *epf_test,
 					 &epf_test->db_bar.phys_addr, &offset);
 
 	if (ret)
-		goto err_doorbell_cleanup;
+		goto err_free_irq;
 
 	reg->doorbell_offset = cpu_to_le32(offset);
 
@@ -769,12 +768,14 @@ static void pci_epf_test_enable_doorbell(struct pci_epf_test *epf_test,
 
 	ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no, &epf_test->db_bar);
 	if (ret)
-		goto err_doorbell_cleanup;
+		goto err_free_irq;
 
 	status |= STATUS_DOORBELL_ENABLE_SUCCESS;
 	reg->status = cpu_to_le32(status);
 	return;
 
+err_free_irq:
+	free_irq(epf->db_msg[0].virq, epf_test);
 err_doorbell_cleanup:
 	pci_epf_test_doorbell_cleanup(epf_test);
 set_status_err:
@@ -794,6 +795,7 @@ static void pci_epf_test_disable_doorbell(struct pci_epf_test *epf_test,
 	if (bar < BAR_0)
 		goto set_status_err;
 
+	free_irq(epf->db_msg[0].virq, epf_test);
 	pci_epf_test_doorbell_cleanup(epf_test);
 
 	/*