USB: serial: propagate late probe errors

Propagate errnos for late probe errors (e.g. -ENOMEM on allocation
failures) instead of always returning -EIO.

Note that some drivers are currently returning -ENODEV from their attach
callbacks when a device is not supported, but this has also been mapped
to -EIO.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

1 files changed, 12 insertions, 11 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index f68275dd1e9f..bb34f9f7eaf4 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -962,8 +962,10 @@ static int usb_serial_probe(struct usb_interface *interface,
         dev_dbg(ddev, "setting up %d port structure(s)\n", max_endpoints);
         for (i = 0; i < max_endpoints; ++i) {
                 port = kzalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
-                if (!port)
-                        goto probe_error;
+                if (!port) {
+                        retval = -ENOMEM;
+                        goto err_free_epds;
+                }
                 tty_port_init(&port->port);
                 port->port.ops = &serial_port_ops;
                 port->serial = serial;
@@ -984,14 +986,14 @@ static int usb_serial_probe(struct usb_interface *interface,
         for (i = 0; i < epds->num_bulk_in; ++i) {
                 retval = setup_port_bulk_in(serial->port[i], epds->bulk_in[i]);
                 if (retval)
-                        goto probe_error;
+                        goto err_free_epds;
         }
 
         for (i = 0; i < epds->num_bulk_out; ++i) {
                 retval = setup_port_bulk_out(serial->port[i],
                                 epds->bulk_out[i]);
                 if (retval)
-                        goto probe_error;
+                        goto err_free_epds;
         }
 
         if (serial->type->read_int_callback) {
@@ -999,7 +1001,7 @@ static int usb_serial_probe(struct usb_interface *interface,
                         retval = setup_port_interrupt_in(serial->port[i],
                                         epds->interrupt_in[i]);
                         if (retval)
-                                goto probe_error;
+                                goto err_free_epds;
                 }
         } else if (epds->num_interrupt_in) {
                 dev_dbg(ddev, "The device claims to support interrupt in transfers, but read_int_callback is not defined\n");
@@ -1010,7 +1012,7 @@ static int usb_serial_probe(struct usb_interface *interface,
                         retval = setup_port_interrupt_out(serial->port[i],
                                         epds->interrupt_out[i]);
                         if (retval)
-                                goto probe_error;
+                                goto err_free_epds;
                 }
         } else if (epds->num_interrupt_out) {
                 dev_dbg(ddev, "The device claims to support interrupt out transfers, but write_int_callback is not defined\n");
@@ -1022,7 +1024,7 @@ static int usb_serial_probe(struct usb_interface *interface,
         if (type->attach) {
                 retval = type->attach(serial);
                 if (retval < 0)
-                        goto probe_error;
+                        goto err_free_epds;
                 serial->attached = 1;
                 if (retval > 0) {
                         /* quietly accept this device, but don't bind to a
@@ -1034,9 +1036,10 @@ static int usb_serial_probe(struct usb_interface *interface,
                 serial->attached = 1;
         }
 
-        if (allocate_minors(serial, num_ports)) {
+        retval = allocate_minors(serial, num_ports);
+        if (retval) {
                 dev_err(ddev, "No more free serial minor numbers\n");
-                goto probe_error;
+                goto err_free_epds;
         }
 
         /* register all of the individual ports with the driver core */
@@ -1058,8 +1061,6 @@ exit:
         module_put(type->driver.owner);
         return 0;
 
-probe_error:
-        retval = -EIO;
 err_free_epds:
         kfree(epds);
 err_put_serial: