[Qemu-devel] [PATCH 15/16] pci-assign: propagate errors from assign_intx()

[Laszlo Ersek <lersek@redhat.com>]

Among the callers, only assigned_initfn() should set the  monitor's stored
error. Other callers may run in contexts where the monitor's stored error
makes no sense. For example:

assigned_dev_pci_write_config()
  assigned_dev_update_msix()
    assign_intx()

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
 hw/i386/kvm/pci-assign.c | 39 ++++++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/hw/i386/kvm/pci-assign.c b/hw/i386/kvm/pci-assign.c
index 0fedca8..6891729 100644
--- a/hw/i386/kvm/pci-assign.c
+++ b/hw/i386/kvm/pci-assign.c
@@ -845,11 +845,11 @@ static void verify_irqchip_in_kernel(Error **errp)
         return;
     }
     error_setg(errp, "pci-assign requires KVM with in-kernel irqchip enabled");
 }
 
-static int assign_intx(AssignedDevice *dev)
+static int assign_intx(AssignedDevice *dev, Error **errp)
 {
     AssignedIRQType new_type;
     PCIINTxRoute intx_route;
     bool intx_host_msi;
     int r;
@@ -861,12 +861,11 @@ static int assign_intx(AssignedDevice *dev)
         return 0;
     }
 
     verify_irqchip_in_kernel(&local_err);
     if (local_err) {
-        error_report("%s", error_get_pretty(local_err));
-        error_free(local_err);
+        error_propagate(errp, local_err);
         return -ENOTSUP;
     }
 
     pci_device_set_intx_routing_notifier(&dev->dev,
                                          assigned_dev_update_irq_routing);
@@ -925,14 +924,15 @@ retry:
                          "using MSI instead");
             error_printf("Some devices do not work properly in this mode.\n");
             dev->features |= ASSIGNED_DEVICE_PREFER_MSI_MASK;
             goto retry;
         }
-        error_report("Failed to assign irq for \"%s\": %s",
-                     dev->dev.qdev.id, strerror(-r));
-        error_report("Perhaps you are assigning a device "
-                     "that shares an IRQ with another device?");
+        error_setg_errno(errp, -r,
+                         "Failed to assign irq for \"%s\"\n"
+                         "Perhaps you are assigning a device "
+                         "that shares an IRQ with another device?",
+                         dev->dev.qdev.id);
         return r;
     }
 
     dev->intx_route = intx_route;
     dev->assigned_irq_type = new_type;
@@ -954,12 +954,15 @@ static void assigned_dev_update_irq_routing(PCIDevice *dev)
 {
     AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, dev);
     Error *err = NULL;
     int r;
 
-    r = assign_intx(assigned_dev);
+    r = assign_intx(assigned_dev, &err);
     if (r < 0) {
+        error_report("%s", error_get_pretty(err));
+        error_free(err);
+        err = NULL;
         qdev_unplug(&dev->qdev, &err);
         assert(!err);
     }
 }
 
@@ -1006,11 +1009,17 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev)
 
         assigned_dev->intx_route.mode = PCI_INTX_DISABLED;
         assigned_dev->intx_route.irq = -1;
         assigned_dev->assigned_irq_type = ASSIGNED_IRQ_MSI;
     } else {
-        assign_intx(assigned_dev);
+        Error *local_err = NULL;
+
+        assign_intx(assigned_dev, &local_err);
+        if (local_err) {
+            error_report("%s", error_get_pretty(local_err));
+            error_free(local_err);
+        }
     }
 }
 
 static void assigned_dev_update_msi_msg(PCIDevice *pci_dev)
 {
@@ -1148,11 +1157,17 @@ static void assigned_dev_update_msix(PCIDevice *pci_dev)
         }
         assigned_dev->intx_route.mode = PCI_INTX_DISABLED;
         assigned_dev->intx_route.irq = -1;
         assigned_dev->assigned_irq_type = ASSIGNED_IRQ_MSIX;
     } else {
-        assign_intx(assigned_dev);
+        Error *local_err = NULL;
+
+        assign_intx(assigned_dev, &local_err);
+        if (local_err) {
+            error_report("%s", error_get_pretty(local_err));
+            error_free(local_err);
+        }
     }
 }
 
 static uint32_t assigned_dev_pci_read_config(PCIDevice *pci_dev,
                                              uint32_t address, int len)
@@ -1817,12 +1832,14 @@ static int assigned_initfn(struct PCIDevice *pci_dev)
         error_free(local_err);
         goto out;
     }
 
     /* assign legacy INTx to the device */
-    r = assign_intx(dev);
+    r = assign_intx(dev, &local_err);
     if (r < 0) {
+        qerror_report_err(local_err);
+        error_free(local_err);
         goto assigned_out;
     }
 
     assigned_dev_load_option_rom(dev);
 
-- 
1.8.3.1