Fix pci_add nic not to exit on bad model

Monitor command "pci_add ADDR nic model=MODEL" uses pci_nic_init() to
create the NIC.  When MODEL is unknown or "?", this prints to stderr
and terminates the program.

Change pci_nic_init() not to treat "?" specially, and to return NULL
on failure.  Switch uses during startup to new convenience wrapper
pci_nic_init_nofail(), which behaves just like pci_nic_init() used to
do.

Bonus bug fix: we now check for qdev_init() failing there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/mips_malta.c

@@ -489,7 +489,7 @@ static void network_init(void)
             /* The malta board has a PCNet card using PCI SLOT 11 */
             default_devaddr = "0b";
 
-        pci_nic_init(nd, "pcnet", default_devaddr);
+        pci_nic_init_nofail(nd, "pcnet", default_devaddr);
     }
 }
 

hw/pc.c

@@ -1345,7 +1345,7 @@ static void pc_init1(ram_addr_t ram_size,
         if (!pci_enabled || (nd->model && strcmp(nd->model, "ne2k_isa") == 0))
             pc_init_ne2k_isa(nd);
         else
-            pci_nic_init(nd, "e1000", NULL);
+            pci_nic_init_nofail(nd, "e1000", NULL);
     }
 
     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {

hw/pci.c

@@ -867,21 +867,48 @@ PCIDevice *pci_nic_init(NICInfo *nd, const char *default_model,
                         const char *default_devaddr)
 {
     const char *devaddr = nd->devaddr ? nd->devaddr : default_devaddr;
+    PCIBus *bus;
+    int devfn;
     PCIDevice *pci_dev;
     DeviceState *dev;
     int i;
 
-    i = qemu_check_nic_model_list(nd, pci_nic_models, default_model);
+    i = qemu_find_nic_model(nd, pci_nic_models, default_model);
-    pci_dev = pci_create(pci_nic_names[i], devaddr);
+    if (i < 0)
+        return NULL;
+
+    bus = pci_get_bus_devfn(&devfn, devaddr);
+    if (!bus) {
+        qemu_error("Invalid PCI device address %s for device %s\n",
+                   devaddr, pci_nic_names[i]);
+        return NULL;
+    }
+
+    pci_dev = pci_create_noinit(bus, devfn, pci_nic_names[i]);
     dev = &pci_dev->qdev;
     if (nd->id)
         dev->id = qemu_strdup(nd->id);
     dev->nd = nd;
-    qdev_init(dev);
+    if (qdev_init(dev) < 0)
+        return NULL;
     nd->private = dev;
     return pci_dev;
 }
 
+PCIDevice *pci_nic_init_nofail(NICInfo *nd, const char *default_model,
+                               const char *default_devaddr)
+{
+    PCIDevice *res;
+
+    if (qemu_show_nic_models(nd->model, pci_nic_models))
+        exit(0);
+
+    res = pci_nic_init(nd, default_model, default_devaddr);
+    if (!res)
+        exit(1);
+    return res;
+}
+
 typedef struct {
     PCIDevice dev;
     PCIBus bus;

hw/pci.h

@@ -256,6 +256,8 @@ PCIBus *pci_register_bus(DeviceState *parent, const char *name,
 int pci_nic_supported(const char *model);
 PCIDevice *pci_nic_init(NICInfo *nd, const char *default_model,
                         const char *default_devaddr);
+PCIDevice *pci_nic_init_nofail(NICInfo *nd, const char *default_model,
+                               const char *default_devaddr);
 void pci_data_write(void *opaque, uint32_t addr, uint32_t val, int len);
 uint32_t pci_data_read(void *opaque, uint32_t addr, int len);
 int pci_bus_num(PCIBus *s);

hw/ppc440_bamboo.c

@@ -119,7 +119,7 @@ static void bamboo_init(ram_addr_t ram_size,
         for (i = 0; i < nb_nics; i++) {
             /* There are no PCI NICs on the Bamboo board, but there are
              * PCI slots, so we can pick whatever default model we want. */
-            pci_nic_init(&nd_table[i], "e1000", NULL);
+            pci_nic_init_nofail(&nd_table[i], "e1000", NULL);
         }
     }
 

hw/ppc_newworld.c

@@ -320,7 +320,7 @@ static void ppc_core99_init (ram_addr_t ram_size,
                                serial_hds[0], serial_hds[1], ESCC_CLOCK, 4);
 
     for(i = 0; i < nb_nics; i++)
-        pci_nic_init(&nd_table[i], "ne2k_pci", NULL);
+        pci_nic_init_nofail(&nd_table[i], "ne2k_pci", NULL);
 
     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
         fprintf(stderr, "qemu: too many IDE bus\n");

hw/ppc_oldworld.c

@@ -333,7 +333,7 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
                                serial_hds[1], ESCC_CLOCK, 4);
 
     for(i = 0; i < nb_nics; i++)
-        pci_nic_init(&nd_table[i], "ne2k_pci", NULL);
+        pci_nic_init_nofail(&nd_table[i], "ne2k_pci", NULL);
 
 
     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {

hw/ppc_prep.c

@@ -697,7 +697,7 @@ static void ppc_prep_init (ram_addr_t ram_size,
         if (strcmp(nd_table[i].model, "ne2k_isa") == 0) {
             isa_ne2000_init(ne2000_io[i], ne2000_irq[i], &nd_table[i]);
         } else {
-            pci_nic_init(&nd_table[i], "ne2k_pci", NULL);
+            pci_nic_init_nofail(&nd_table[i], "ne2k_pci", NULL);
         }
     }
 

hw/ppce500_mpc8544ds.c

@@ -219,7 +219,7 @@ static void mpc8544ds_init(ram_addr_t ram_size,
     if (pci_bus) {
         /* Register network interfaces. */
         for (i = 0; i < nb_nics; i++) {
-            pci_nic_init(&nd_table[i], "virtio", NULL);
+            pci_nic_init_nofail(&nd_table[i], "virtio", NULL);
         }
     }
 

hw/r2d.c

@@ -236,7 +236,7 @@ static void r2d_init(ram_addr_t ram_size,
 
     /* NIC: rtl8139 on-board, and 2 slots. */
     for (i = 0; i < nb_nics; i++)
-        pci_nic_init(&nd_table[i], "rtl8139", i==0 ? "2" : NULL);
+        pci_nic_init_nofail(&nd_table[i], "rtl8139", i==0 ? "2" : NULL);
 
     /* Todo: register on board registers */
     if (kernel_filename) {

hw/realview.c

@@ -125,7 +125,7 @@ static void realview_init(ram_addr_t ram_size,
             smc91c111_init(nd, 0x4e000000, pic[28]);
             done_smc = 1;
         } else {
-            pci_nic_init(nd, "rtl8139", NULL);
+            pci_nic_init_nofail(nd, "rtl8139", NULL);
         }
     }
 

hw/sun4u.c

@@ -610,7 +610,7 @@ static void sun4uv_init(ram_addr_t RAM_size,
     }
 
     for(i = 0; i < nb_nics; i++)
-        pci_nic_init(&nd_table[i], "ne2k_pci", NULL);
+        pci_nic_init_nofail(&nd_table[i], "ne2k_pci", NULL);
 
     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
         fprintf(stderr, "qemu: too many IDE bus\n");

hw/versatilepb.c

@@ -213,7 +213,7 @@ static void versatile_init(ram_addr_t ram_size,
             smc91c111_init(nd, 0x10010000, sic[25]);
             done_smc = 1;
         } else {
-            pci_nic_init(nd, "rtl8139", NULL);
+            pci_nic_init_nofail(nd, "rtl8139", NULL);
         }
     }
     if (usb_enabled) {

net.c

@@ -2348,6 +2348,19 @@ static int nic_get_free_idx(void)
     return -1;
 }
 
+int qemu_show_nic_models(const char *arg, const char *const *models)
+{
+    int i;
+
+    if (!arg || strcmp(arg, "?"))
+        return 0;
+
+    fprintf(stderr, "qemu: Supported NIC models: ");
+    for (i = 0 ; models[i]; i++)
+        fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
+    return 1;
+}
+
 void qemu_check_nic_model(NICInfo *nd, const char *model)
 {
     const char *models[2];
@@ -2355,31 +2368,27 @@ void qemu_check_nic_model(NICInfo *nd, const char *model)
     models[0] = model;
     models[1] = NULL;
 
-    qemu_check_nic_model_list(nd, models, model);
+    if (qemu_show_nic_models(nd->model, models))
+        exit(0);
+    if (qemu_find_nic_model(nd, models, model) < 0)
+        exit(1);
 }
 
-int qemu_check_nic_model_list(NICInfo *nd, const char * const *models,
+int qemu_find_nic_model(NICInfo *nd, const char * const *models,
-                              const char *default_model)
+                        const char *default_model)
 {
-    int i, exit_status = 0;
+    int i;
 
     if (!nd->model)
         nd->model = strdup(default_model);
 
-    if (strcmp(nd->model, "?") != 0) {
+    for (i = 0 ; models[i]; i++) {
-        for (i = 0 ; models[i]; i++)
+        if (strcmp(nd->model, models[i]) == 0)
-            if (strcmp(nd->model, models[i]) == 0)
+            return i;
-                return i;
-
-        fprintf(stderr, "qemu: Unsupported NIC model: %s\n", nd->model);
-        exit_status = 1;
     }
 
-    fprintf(stderr, "qemu: Supported NIC models: ");
+    qemu_error("qemu: Unsupported NIC model: %s\n", nd->model);
-    for (i = 0 ; models[i]; i++)
+    return -1;
-        fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
-
-    exit(exit_status);
 }
 
 static int net_handle_fd_param(Monitor *mon, const char *param)

net.h

@@ -75,9 +75,10 @@ ssize_t qemu_send_packet_async(VLANClientState *vc, const uint8_t *buf,
 void qemu_purge_queued_packets(VLANClientState *vc);
 void qemu_flush_queued_packets(VLANClientState *vc);
 void qemu_format_nic_info_str(VLANClientState *vc, uint8_t macaddr[6]);
+int qemu_show_nic_models(const char *arg, const char *const *models);
 void qemu_check_nic_model(NICInfo *nd, const char *model);
-int qemu_check_nic_model_list(NICInfo *nd, const char * const *models,
+int qemu_find_nic_model(NICInfo *nd, const char * const *models,
-                              const char *default_model);
+                        const char *default_model);
 void qemu_handler_true(void *opaque);
 
 void do_info_network(Monitor *mon);