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usb: gadget: f_hid: tidy error handling in hidg_alloc

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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.

Tested-by: Lee Jones <lee@kernel.org>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Reviewed-by: Lee Jones <lee@kernel.org>
Signed-off-by: John Keeping <john@metanate.com>
Link: https://lore.kernel.org/r/20221122123523.3068034-4-john@metanate.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Keeping 2022-11-22 12:35:23 +00:00 committed by Greg Kroah-Hartman
parent 70a3288a75
commit 944fe915d0
1 changed files with 11 additions and 10 deletions
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21
drivers/usb/gadget/function/f_hid.c
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@ -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);