[PATCH] RDMA/usnic: Stop using iommu_present()

[Robin Murphy]

Even if an IOMMU might be present for some PCI segment in the system,
that doesn't necessarily mean it provides translation for the device(s)
we care about. Replace iommu_present() with a more appropriate check at
probe time, and garbage-collect the resulting empty init function.

Signed-off-by: Robin Murphy <robin.mur...@arm.com>
---
 drivers/infiniband/hw/usnic/usnic_ib_main.c | 11 +++++------
 drivers/infiniband/hw/usnic/usnic_uiom.c    | 10 ----------
 drivers/infiniband/hw/usnic/usnic_uiom.h    |  1 -
 3 files changed, 5 insertions(+), 17 deletions(-)

diff --git a/drivers/infiniband/hw/usnic/usnic_ib_main.c 
b/drivers/infiniband/hw/usnic/usnic_ib_main.c
index d346dd48e731..46653ad56f5a 100644
--- a/drivers/infiniband/hw/usnic/usnic_ib_main.c
+++ b/drivers/infiniband/hw/usnic/usnic_ib_main.c
@@ -534,6 +534,11 @@ static int usnic_ib_pci_probe(struct pci_dev *pdev,
        struct usnic_ib_vf *vf;
        enum usnic_vnic_res_type res_type;
 
+       if (!device_iommu_mapped(&pdev->dev)) {
+               usnic_err("IOMMU required but not present or enabled.  USNIC 
QPs will not function w/o enabling IOMMU\n");
+               return -EPERM;
+       }
+
        vf = kzalloc(sizeof(*vf), GFP_KERNEL);
        if (!vf)
                return -ENOMEM;
@@ -642,12 +647,6 @@ static int __init usnic_ib_init(void)
 
        printk_once(KERN_INFO "%s", usnic_version);
 
-       err = usnic_uiom_init(DRV_NAME);
-       if (err) {
-               usnic_err("Unable to initialize umem with err %d\n", err);
-               return err;
-       }
-
        err = pci_register_driver(&usnic_ib_pci_driver);
        if (err) {
                usnic_err("Unable to register with PCI\n");
diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c 
b/drivers/infiniband/hw/usnic/usnic_uiom.c
index 760b254ba42d..8c48027614a1 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom.c
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
@@ -556,13 +556,3 @@ void usnic_uiom_free_dev_list(struct device **devs)
 {
        kfree(devs);
 }
-
-int usnic_uiom_init(char *drv_name)
-{
-       if (!iommu_present(&pci_bus_type)) {
-               usnic_err("IOMMU required but not present or enabled.  USNIC 
QPs will not function w/o enabling IOMMU\n");
-               return -EPERM;
-       }
-
-       return 0;
-}
diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.h 
b/drivers/infiniband/hw/usnic/usnic_uiom.h
index 7ec8991ace67..9407522179e9 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom.h
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.h
@@ -91,5 +91,4 @@ struct usnic_uiom_reg *usnic_uiom_reg_get(struct 
usnic_uiom_pd *pd,
                                                unsigned long addr, size_t size,
                                                int access, int dmasync);
 void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr);
-int usnic_uiom_init(char *drv_name);
 #endif /* USNIC_UIOM_H_ */
-- 
2.28.0.dirty

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