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SubjectRe: [PATCH v2 27/31] usb/gadget/snps_udc_core: Remove struct timer_list.data use
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On Wed, Sep 20 2017, Kees Cook wrote:
> If the probe fails, udc_remove() will not be called, so there is no
> reason to make del_timer_sync() calls conditional. As a result, use of
> the .data field can be dropped, in support of making removing this field
> entirely from struct timer_list.
>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Raviteja Garimella <raviteja.garimella@broadcom.com>
> Cc: Michal Nazarewicz <mina86@mina86.com>

Acked-by: Michal Nazarewicz <mina86@mina86.com>

> Cc: "Gustavo A. R. Silva" <garsilva@embeddedor.com>
> Cc: linux-usb@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> drivers/usb/gadget/udc/snps_udc_core.c | 14 ++++----------
> 1 file changed, 4 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/snps_udc_core.c b/drivers/usb/gadget/udc/snps_udc_core.c
> index 5460e5ba1c3c..e05bdc16e1e3 100644
> --- a/drivers/usb/gadget/udc/snps_udc_core.c
> +++ b/drivers/usb/gadget/udc/snps_udc_core.c
> @@ -3067,14 +3067,12 @@ void udc_remove(struct udc *dev)
> stop_timer++;
> if (timer_pending(&udc_timer))
> wait_for_completion(&on_exit);
> - if (udc_timer.data)
> - del_timer_sync(&udc_timer);
> + del_timer_sync(&udc_timer);
> /* remove pollstall timer */
> stop_pollstall_timer++;
> if (timer_pending(&udc_pollstall_timer))
> wait_for_completion(&on_pollstall_exit);
> - if (udc_pollstall_timer.data)
> - del_timer_sync(&udc_pollstall_timer);
> + del_timer_sync(&udc_pollstall_timer);
> udc = NULL;
> }
> EXPORT_SYMBOL_GPL(udc_remove);
> @@ -3164,10 +3162,6 @@ int udc_probe(struct udc *dev)
> u32 reg;
> int retval;
>
> - /* mark timer as not initialized */
> - udc_timer.data = 0;
> - udc_pollstall_timer.data = 0;
> -
> /* device struct setup */
> dev->gadget.ops = &udc_ops;
>
> @@ -3207,8 +3201,8 @@ int udc_probe(struct udc *dev)
> goto finished;
>
> /* timer init */
> - setup_timer(&udc_timer, udc_timer_function, 1);
> - setup_timer(&udc_pollstall_timer, udc_pollstall_timer_function, 1);
> + setup_timer(&udc_timer, udc_timer_function, 0);
> + setup_timer(&udc_pollstall_timer, udc_pollstall_timer_function, 0);
>
> /* set SD */
> reg = readl(&dev->regs->ctl);

--
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

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