linux-kernel - Re: [PATCH v7 1/4] mfd: add support for Diolan DLN-2 devices

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Date:	Fri, 10 Oct 2014 11:14:34 +0200
From:	Johan Hovold <johan@...nel.org>
To:	Octavian Purdila <octavian.purdila@...el.com>
Cc:	Joe Perches <joe@...ches.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Johan Hovold <johan@...nel.org>,
	Daniel Baluta <daniel.baluta@...el.com>,
	Laurentiu Palcu <laurentiu.palcu@...el.com>,
	linux-usb@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH v7 1/4] mfd: add support for Diolan DLN-2 devices

On Thu, Oct 09, 2014 at 11:27:12PM +0300, Octavian Purdila wrote:
> On Thu, Oct 9, 2014 at 10:44 PM, Joe Perches <joe@...ches.com> wrote:
> > On Thu, 2014-10-09 at 22:22 +0300, Octavian Purdila wrote:

> >> diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c
> > []
> > +struct dln2_mod_rx_slots {
> > +       /* RX slots bitmap */
> > +       unsigned long bmap;
> >
> > Probably better as:
> >         DECLARE_BITMAP(bmap, DLN2_MAX_RX_SLOTS);
> >
> > Then a lot of &ptr->bmap uses can be ptr->bmap
> >
> 
> Originally I was using DECLARE_BITMAP, but during the review process
> Johan suggested to use unsigned long. Now that I think about it, it
> sounds better to use DECLARE_BITMAP and of couse keep using
> find_first_bit, set_bit, etc. Johan do you see any issue with that?

No, that's fine as long as you keep the bitops.

> >> +struct dln2_dev {
> >> +     struct usb_device *usb_dev;
> >> +     struct usb_interface *interface;
> >> +     u8 ep_in;
> >> +     u8 ep_out;
> >> +
> >> +     struct urb *rx_urb[DLN2_MAX_URBS];
> >> +     void *rx_buf[DLN2_MAX_URBS];
> >> +
> >> +     struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES];
> >> +
> >> +     struct list_head event_cb_list;
> >> +     spinlock_t event_cb_lock;
> >> +
> >> +     bool disconnect;
> >> +     int active_transfers;
> >> +     wait_queue_head_t disconnect_wq;
> >> +     spinlock_t disconnect_lock;
> >> +};
> >
> > Maybe reorder the bools and u8s to pack this a bit better?
> 
> I prefer to keep it this way, it's not wasting a lot since you will
> only have a handful of these devices, and it keeps the related data
> together.

I agree.

Johan
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