linux-kernel - [PATCH 5.14 162/169] s390/pci: cleanup resources only if necessary

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Date:   Mon, 25 Oct 2021 21:15:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Matthew Rosato <mjrosato@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: [PATCH 5.14 162/169] s390/pci: cleanup resources only if necessary

From: Niklas Schnelle <schnelle@...ux.ibm.com>

commit 02368b7cf6c7badefa13741aed7a8b91d9a11b19 upstream.

It's currently safe to call zpci_cleanup_bus_resources() even if the
resources were never created but it makes no sense so check
zdev->has_resources before we call zpci_cleanup_bus_resources() in
zpci_release_device().

Reviewed-by: Matthew Rosato <mjrosato@...ux.ibm.com>
Acked-by: Pierre Morel <pmorel@...ux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/s390/pci/pci.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -829,7 +829,8 @@ void zpci_release_device(struct kref *kr
 	case ZPCI_FN_STATE_STANDBY:
 		if (zdev->has_hp_slot)
 			zpci_exit_slot(zdev);
-		zpci_cleanup_bus_resources(zdev);
+		if (zdev->has_resources)
+			zpci_cleanup_bus_resources(zdev);
 		zpci_bus_device_unregister(zdev);
 		zpci_destroy_iommu(zdev);
 		fallthrough;