staging: unisys: visorbus: my_device_create add error handling

Add proper error handling to the function my_device_create and
propagate the error message up the stack.

Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: David Binder <david.binder@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/unisys/visorbus/visorchipset.c b/drivers/staging/unisys/visorbus/visorchipset.c
index a6c7a89..27f52ca 100644 (file)
--- a/drivers/staging/unisys/visorbus/visorchipset.c
+++ b/drivers/staging/unisys/visorbus/visorchipset.c
@@ -880,7 +880,7 @@ err_respond:
        return err;
 }
 
-static void
+static int
 my_device_create(struct controlvm_message *inmsg)
 {
        struct controlvm_message_packet *cmd = &inmsg->cmd;
@@ -890,37 +890,37 @@ my_device_create(struct controlvm_message *inmsg)
        struct visor_device *dev_info = NULL;
        struct visor_device *bus_info;
        struct visorchannel *visorchannel;
-       int rc = CONTROLVM_RESP_SUCCESS;
+       int err;
 
        bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
        if (!bus_info) {
                POSTCODE_LINUX(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
                               DIAG_SEVERITY_ERR);
-               rc = -CONTROLVM_RESP_BUS_INVALID;
-               goto out_respond;
+               err = -ENODEV;
+               goto err_respond;
        }
 
        if (bus_info->state.created == 0) {
                POSTCODE_LINUX(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
                               DIAG_SEVERITY_ERR);
-               rc = -CONTROLVM_RESP_BUS_INVALID;
-               goto out_respond;
+               err = -EINVAL;
+               goto err_respond;
        }
 
        dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
        if (dev_info && (dev_info->state.created == 1)) {
                POSTCODE_LINUX(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
                               DIAG_SEVERITY_ERR);
-               rc = -CONTROLVM_RESP_ALREADY_DONE;
-               goto out_respond;
+               err = -EEXIST;
+               goto err_respond;
        }
 
        dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
        if (!dev_info) {
                POSTCODE_LINUX(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
                               DIAG_SEVERITY_ERR);
-               rc = -CONTROLVM_RESP_KMALLOC_FAILED;
-               goto out_respond;
+               err = -ENOMEM;
+               goto err_respond;
        }
 
        dev_info->chipset_bus_no = bus_no;
@@ -942,20 +942,23 @@ my_device_create(struct controlvm_message *inmsg)
        if (!visorchannel) {
                POSTCODE_LINUX(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
                               DIAG_SEVERITY_ERR);
-               rc = -CONTROLVM_RESP_KMALLOC_FAILED;
-               goto out_free_dev_info;
+               err = -ENOMEM;
+               goto err_free_dev_info;
        }
        dev_info->visorchannel = visorchannel;
        dev_info->channel_type_guid = cmd->create_device.data_type_uuid;
        if (uuid_le_cmp(cmd->create_device.data_type_uuid,
-                       spar_vhba_channel_protocol_uuid) == 0)
-               save_crash_message(inmsg, CRASH_DEV);
+                       spar_vhba_channel_protocol_uuid) == 0) {
+               err = save_crash_message(inmsg, CRASH_DEV);
+               if (err)
+                       goto err_free_dev_info;
+       }
 
        if (inmsg->hdr.flags.response_expected == 1) {
                pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
                if (!pmsg_hdr) {
-                       rc = -CONTROLVM_RESP_KMALLOC_FAILED;
-                       goto out_free_dev_info;
+                       err = -ENOMEM;
+                       goto err_free_dev_info;
                }
 
                memcpy(pmsg_hdr, &inmsg->hdr,
@@ -966,14 +969,15 @@ my_device_create(struct controlvm_message *inmsg)
        chipset_device_create(dev_info);
        POSTCODE_LINUX(DEVICE_CREATE_EXIT_PC, dev_no, bus_no,
                       DIAG_SEVERITY_PRINT);
-       return;
+       return 0;
 
-out_free_dev_info:
+err_free_dev_info:
        kfree(dev_info);
 
-out_respond:
+err_respond:
        if (inmsg->hdr.flags.response_expected == 1)
-               device_responder(inmsg->hdr.id, &inmsg->hdr, rc);
+               device_responder(inmsg->hdr.id, &inmsg->hdr, err);
+       return err;
 }
 
 static void