From: Dave Jiang dave.jiang@intel.com
[ Upstream commit 7eb25da161befbc9a80e94e1bd90d6c06aa645cf ]
->shutdown() call should only be responsible for quiescing the device. Currently it is doing PCI device tear down. This causes issue when things like MMIO mapping is removed while idxd_unregister_devices() will trigger removal of idxd device sub-driver and still initiates MMIO writes to the device. Another issue is with the unregistering of idxd 'struct device', the memory context gets freed. So the teardown calls are accessing freed memory and can cause kernel oops. Move all the teardown bits that doesn't belong in shutdown to ->remove() call. Move unregistering of the idxd conf_dev 'struct device' to after doing all the teardown to free all the memory that's no longer needed.
Fixes: 47c16ac27d4c ("dmaengine: idxd: fix idxd conf_dev 'struct device' lifetime") Signed-off-by: Dave Jiang dave.jiang@intel.com Link: https://lore.kernel.org/r/162629983901.395844.17964803190905549615.stgit@dji... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/idxd/init.c | 26 +++++++++++++++++--------- drivers/dma/idxd/sysfs.c | 2 -- 2 files changed, 17 insertions(+), 11 deletions(-)
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c index 4bc80eb6b9e7..32cca6a0e66a 100644 --- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -759,32 +759,40 @@ static void idxd_shutdown(struct pci_dev *pdev) for (i = 0; i < msixcnt; i++) { irq_entry = &idxd->irq_entries[i]; synchronize_irq(irq_entry->vector); - free_irq(irq_entry->vector, irq_entry); if (i == 0) continue; idxd_flush_pending_llist(irq_entry); idxd_flush_work_list(irq_entry); } - - idxd_msix_perm_clear(idxd); - idxd_release_int_handles(idxd); - pci_free_irq_vectors(pdev); - pci_iounmap(pdev, idxd->reg_base); - pci_disable_device(pdev); - destroy_workqueue(idxd->wq); + flush_workqueue(idxd->wq); }
static void idxd_remove(struct pci_dev *pdev) { struct idxd_device *idxd = pci_get_drvdata(pdev); + struct idxd_irq_entry *irq_entry; + int msixcnt = pci_msix_vec_count(pdev); + int i;
dev_dbg(&pdev->dev, "%s called\n", __func__); idxd_shutdown(pdev); if (device_pasid_enabled(idxd)) idxd_disable_system_pasid(idxd); idxd_unregister_devices(idxd); - perfmon_pmu_remove(idxd); + + for (i = 0; i < msixcnt; i++) { + irq_entry = &idxd->irq_entries[i]; + free_irq(irq_entry->vector, irq_entry); + } + idxd_msix_perm_clear(idxd); + idxd_release_int_handles(idxd); + pci_free_irq_vectors(pdev); + pci_iounmap(pdev, idxd->reg_base); iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA); + pci_disable_device(pdev); + destroy_workqueue(idxd->wq); + perfmon_pmu_remove(idxd); + device_unregister(&idxd->conf_dev); }
static struct pci_driver idxd_pci_driver = { diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c index 0460d58e3941..bb4df63906a7 100644 --- a/drivers/dma/idxd/sysfs.c +++ b/drivers/dma/idxd/sysfs.c @@ -1744,8 +1744,6 @@ void idxd_unregister_devices(struct idxd_device *idxd)
device_unregister(&group->conf_dev); } - - device_unregister(&idxd->conf_dev); }
int idxd_register_bus_type(void)