linux-kernel - Re: [PATCH 23/29] idr: Add ida_is

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Date:   Fri, 18 Nov 2016 14:56:08 +0300
From:   Konstantin Khlebnikov <koct9i@...il.com>
To:     Matthew Wilcox <mawilcox@...uxonhyperv.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Matthew Wilcox <willy@...ux.intel.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 23/29] idr: Add ida_is_empty

On Thu, Nov 17, 2016 at 3:16 AM, Matthew Wilcox
<mawilcox@...uxonhyperv.com> wrote:
> From: Matthew Wilcox <willy@...ux.intel.com>
>
> Two of the USB Gadgets were poking around in the internals of struct ida
> in order to determine if it is empty.  Add the appropriate abstraction.

Looks good. This could be applied separately.

>
> Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
> ---
>  drivers/usb/gadget/function/f_hid.c     | 6 +++---
>  drivers/usb/gadget/function/f_printer.c | 6 +++---
>  include/linux/idr.h                     | 5 +++++
>  3 files changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
> index e2966f8..b9b04fc 100644
> --- a/drivers/usb/gadget/function/f_hid.c
> +++ b/drivers/usb/gadget/function/f_hid.c
> @@ -840,7 +840,7 @@ static void hidg_free_inst(struct usb_function_instance *f)
>         mutex_lock(&hidg_ida_lock);
>
>         hidg_put_minor(opts->minor);
> -       if (idr_is_empty(&hidg_ida.idr))
> +       if (ida_is_empty(&hidg_ida))
>                 ghid_cleanup();
>
>         mutex_unlock(&hidg_ida_lock);
> @@ -866,7 +866,7 @@ static struct usb_function_instance *hidg_alloc_inst(void)
>
>         mutex_lock(&hidg_ida_lock);
>
> -       if (idr_is_empty(&hidg_ida.idr)) {
> +       if (ida_is_empty(&hidg_ida)) {
>                 status = ghid_setup(NULL, HIDG_MINORS);
>                 if (status)  {
>                         ret = ERR_PTR(status);
> @@ -879,7 +879,7 @@ static struct usb_function_instance *hidg_alloc_inst(void)
>         if (opts->minor < 0) {
>                 ret = ERR_PTR(opts->minor);
>                 kfree(opts);
> -               if (idr_is_empty(&hidg_ida.idr))
> +               if (ida_is_empty(&hidg_ida))
>                         ghid_cleanup();
>                 goto unlock;
>         }
> diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c
> index 0de36cd..8054da9 100644
> --- a/drivers/usb/gadget/function/f_printer.c
> +++ b/drivers/usb/gadget/function/f_printer.c
> @@ -1265,7 +1265,7 @@ static void gprinter_free_inst(struct usb_function_instance *f)
>         mutex_lock(&printer_ida_lock);
>
>         gprinter_put_minor(opts->minor);
> -       if (idr_is_empty(&printer_ida.idr))
> +       if (ida_is_empty(&printer_ida))
>                 gprinter_cleanup();
>
>         mutex_unlock(&printer_ida_lock);
> @@ -1289,7 +1289,7 @@ static struct usb_function_instance *gprinter_alloc_inst(void)
>
>         mutex_lock(&printer_ida_lock);
>
> -       if (idr_is_empty(&printer_ida.idr)) {
> +       if (ida_is_empty(&printer_ida)) {
>                 status = gprinter_setup(PRINTER_MINORS);
>                 if (status) {
>                         ret = ERR_PTR(status);
> @@ -1302,7 +1302,7 @@ static struct usb_function_instance *gprinter_alloc_inst(void)
>         if (opts->minor < 0) {
>                 ret = ERR_PTR(opts->minor);
>                 kfree(opts);
> -               if (idr_is_empty(&printer_ida.idr))
> +               if (ida_is_empty(&printer_ida))
>                         gprinter_cleanup();
>                 goto unlock;
>         }
> diff --git a/include/linux/idr.h b/include/linux/idr.h
> index 083d61e..3639a28 100644
> --- a/include/linux/idr.h
> +++ b/include/linux/idr.h
> @@ -195,6 +195,11 @@ static inline int ida_get_new(struct ida *ida, int *p_id)
>         return ida_get_new_above(ida, 0, p_id);
>  }
>
> +static inline bool ida_is_empty(struct ida *ida)
> +{
> +       return idr_is_empty(&ida->idr);
> +}
> +
>  void __init idr_init_cache(void);
>
>  #endif /* __IDR_H__ */
> --
> 2.10.2
>