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authorNiklas Schnelle <schnelle@linux.ibm.com>2022-11-09 17:29:01 +0300
committerJoerg Roedel <jroedel@suse.de>2022-11-19 12:28:16 +0300
commit2ba8336dab5fb81452aea9c21dfc870050a017f3 (patch)
tree28cf21630a2a43438e63a6b8001f32ebd9abc8b8 /arch/s390/pci/pci.c
parentc228f5a043370ef02867e4f0aab1bdc8422500e6 (diff)
downloadlinux-2ba8336dab5fb81452aea9c21dfc870050a017f3.tar.xz
iommu/s390: Use RCU to allow concurrent domain_list iteration
The s390_domain->devices list is only added to when new devices are attached but is iterated through in read-only fashion for every mapping operation as well as for I/O TLB flushes and thus in performance critical code causing contention on the s390_domain->list_lock. Fortunately such a read-mostly linked list is a standard use case for RCU. This change closely follows the example fpr RCU protected list given in Documentation/RCU/listRCU.rst. Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Link: https://lore.kernel.org/r/20221109142903.4080275-4-schnelle@linux.ibm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'arch/s390/pci/pci.c')
-rw-r--r--arch/s390/pci/pci.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index a703dcd94a68..ef38b1514c77 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -996,7 +996,7 @@ void zpci_release_device(struct kref *kref)
break;
}
zpci_dbg(3, "rem fid:%x\n", zdev->fid);
- kfree(zdev);
+ kfree_rcu(zdev, rcu);
}
int zpci_report_error(struct pci_dev *pdev,