Unify error handling at the end of the function, reducing the risk of
missing something on one of the error paths.
Moving the increment of opts->refcnt later means there is no need to
decrement it on the error path and is safe as this is guarded by
opts->lock which is held for this entire section.
Signed-off-by: John Keeping <john@xxxxxxxxxxxx>
---
drivers/usb/gadget/function/f_hid.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
index 6be6009f911e..a8da3b4a2855 100644
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -1269,18 +1269,14 @@ static struct usb_function *hidg_alloc(struct usb_function_instance *fi)
opts = container_of(fi, struct f_hid_opts, func_inst);
mutex_lock(&opts->lock);
- ++opts->refcnt;
device_initialize(&hidg->dev);
hidg->dev.release = hidg_release;
hidg->dev.class = hidg_class;
hidg->dev.devt = MKDEV(major, opts->minor);
ret = dev_set_name(&hidg->dev, "hidg%d", opts->minor);
- if (ret) {
- --opts->refcnt;
- mutex_unlock(&opts->lock);
- return ERR_PTR(ret);
- }
+ if (ret)
+ goto err_unlock;
hidg->bInterfaceSubClass = opts->subclass;
hidg->bInterfaceProtocol = opts->protocol;
@@ -1291,14 +1287,13 @@ static struct usb_function *hidg_alloc(struct usb_function_instance *fi)
opts->report_desc_length,
GFP_KERNEL);
if (!hidg->report_desc) {
- put_device(&hidg->dev);
- --opts->refcnt;
- mutex_unlock(&opts->lock);
- return ERR_PTR(-ENOMEM);
+ ret = -ENOMEM;
+ goto err_put_device;
}
}
hidg->use_out_ep = !opts->no_out_endpoint;
+ ++opts->refcnt;
mutex_unlock(&opts->lock);
hidg->func.name = "hid";
@@ -1313,6 +1308,12 @@ static struct usb_function *hidg_alloc(struct usb_function_instance *fi)
hidg->qlen = 4;
return &hidg->func;
+
+err_put_device:
+ put_device(&hidg->dev);
+err_unlock:
+ mutex_unlock(&opts->lock);
+ return ERR_PTR(ret);
}
DECLARE_USB_FUNCTION_INIT(hid, hidg_alloc_inst, hidg_alloc);
--
2.38.1
