linux-kernel - Re: [PATCH] usb: host: max3421-hcd: unconditionally use GFP_ATOMIC in max3421_urb

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Message-ID: <CALnQHM0wkN4RGaia8PoCRnESpY9aV=HMZCH9fuRo8W=R4o1VGw@mail.gmail.com>
Date:	Thu, 19 Jun 2014 13:49:28 -0600
From:	David Mosberger <davidm@...uge.net>
To:	Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] usb: host: max3421-hcd: unconditionally use GFP_ATOMIC in max3421_urb_enqueue()

On Thu, Jun 19, 2014 at 1:44 PM, Alexey Khoroshilov
<khoroshilov@...ras.ru> wrote:
> As far as kzalloc() is called with spinlock held,
> we have to pass GFP_ATOMIC regardless of mem_flags argument.

Good catch, thanks!

> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>

Acked-by: David Mosberger <davidm@...uge.net>

> ---
>  drivers/usb/host/max3421-hcd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/host/max3421-hcd.c b/drivers/usb/host/max3421-hcd.c
> index 858efcfda50b..ed22424dbec7 100644
> --- a/drivers/usb/host/max3421-hcd.c
> +++ b/drivers/usb/host/max3421-hcd.c
> @@ -1551,7 +1551,7 @@ max3421_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
>         max3421_ep = urb->ep->hcpriv;
>         if (!max3421_ep) {
>                 /* gets freed in max3421_endpoint_disable: */
> -               max3421_ep = kzalloc(sizeof(struct max3421_ep), mem_flags);
> +               max3421_ep = kzalloc(sizeof(struct max3421_ep), GFP_ATOMIC);
>                 if (!max3421_ep) {
>                         retval = -ENOMEM;
>                         goto out;
> --
> 1.9.1
>



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