linux-kernel - Re: [PATCH 1/1] USB: inode.c: fix unbalanced spin_lock in ep0

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Message-ID: <566B38B3.8000106@cogentembedded.com>
Date:	Fri, 11 Dec 2015 23:57:23 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	David Eccher <d.eccher@...il.com>, Felipe Balbi <balbi@...com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Al Viro <viro@...iv.linux.org.uk>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] USB: inode.c: fix unbalanced spin_lock in ep0_write

Hello.

On 12/11/2015 10:56 PM, David Eccher wrote:

> Fix bad unlock balance: ep0_write enter with the locks locked from inode.c:1769,
> hence it must exit with spinlock held to avoid double unlock in dev_config.
>
> Signed-off-by: David Eccher <d.eccher@...il.com>
> ---
>   drivers/usb/gadget/legacy/inode.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
> index f454c7a..b968c25 100644
> --- a/drivers/usb/gadget/legacy/inode.c
> +++ b/drivers/usb/gadget/legacy/inode.c
> @@ -1144,6 +1144,7 @@ ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
>   				} else
>   					retval = len;
>
> +				spin_lock_irq (&dev->lock);

    I guess you hadn't run the patch thru scripts/checkpatch.pl?

MBR, Sergei

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