From: Alan Stern <stern@rowland.harvard.edu>
To: gavinli@thegavinli.com
Cc: gregkh@linuxfoundation.org, <linux-usb@vger.kernel.org>,
Gavin Li <git@thegavinli.com>
Subject: Re: [PATCH] usb: usbfs: only account once for mmap()'ed usb memory usage
Date: Thu, 15 Aug 2019 15:16:47 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1908151513490.1343-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <20190814212924.10381-1-gavinli@thegavinli.com>
On Wed, 14 Aug 2019 gavinli@thegavinli.com wrote:
> From: Gavin Li <git@thegavinli.com>
>
> Memory usage for USB memory allocated via mmap() is already accounted
> for at mmap() time; no need to account for it again at submiturb time.
>
> Signed-off-by: Gavin Li <git@thegavinli.com>
> ---
> drivers/usb/core/devio.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
> index bbe9c2edd3e7..9681dd55473b 100644
> --- a/drivers/usb/core/devio.c
> +++ b/drivers/usb/core/devio.c
> @@ -1603,7 +1603,8 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
> if (as->usbm)
> num_sgs = 0;
>
> - u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
> + u += sizeof(struct async) + sizeof(struct urb) +
> + (as->usbm ? 0 : uurb->buffer_length) +
> num_sgs * sizeof(struct scatterlist);
> ret = usbfs_increase_memory_usage(u);
> if (ret)
>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
prev parent reply other threads:[~2019-08-15 19:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 21:29 [PATCH] usb: usbfs: only account once for mmap()'ed usb memory usage gavinli
2019-08-15 12:53 ` Greg KH
2019-08-16 5:51 ` Gavin Li
2019-08-15 19:16 ` Alan Stern [this message]
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