Re: [patch] USB: mos7720: use GFP_ATOMIC under spinlock

[Johan Hovold <jhovold@gmail.com>]

On Fri, Aug 16, 2013 at 10:16:59AM +0300, Dan Carpenter wrote:
> The write_parport_reg_nonblock() function shouldn't sleep because it's
> called with spinlocks held.

Ouch. Thanks for catching this.

> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Cc: stable@vger.kernel.org
Acked-by: Johan Hovold <jhovold@gmail.com>

Greg, this one is needed in 3.11 (with a stable tag) as the offending
commit ef6c8c1d ("USB: mos7720: fix broken control requests") is in
usb-3.11-rc6.

Thanks,
Johan

> ---
> 
> diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
> index b013001..248fda6 100644
> --- a/drivers/usb/serial/mos7720.c
> +++ b/drivers/usb/serial/mos7720.c
> @@ -374,7 +374,7 @@ static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
>  		kfree(urbtrack);
>  		return -ENOMEM;
>  	}
> -	urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_KERNEL);
> +	urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
>  	if (!urbtrack->setup) {
>  		usb_free_urb(urbtrack->urb);
>  		kfree(urbtrack);