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Date: Fri, 27 Apr 2018 01:16:59 +0300 From: Laurent Pinchart <laurent.pinchart@...asonboard.com> To: Jia-Ju Bai <baijiaju1990@...il.com> Cc: architt@...eaurora.org, a.hajda@...sung.com, airlied@...ux.ie, daniel.vetter@...ll.ch, bhumirks@...il.com, narmstrong@...libre.com, inki.dae@...sung.com, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] gpu: drm: bridge: adv7511: Replace mdelay with usleep_range in adv7511_probe Hi Jia-Ju, Thank you for the patch. On Wednesday, 11 April 2018 11:33:42 EEST Jia-Ju Bai wrote: > adv7511_probe() is never called in atomic context. > This function is only set as ".probe" in struct i2c_driver. > > Despite never getting called from atomic context, adv7511_probe() > calls mdelay() to busily wait. > This is not necessary and can be replaced with usleep_range() to > avoid busy waiting. > > This is found by a static analysis tool named DCNS written by myself. > And I also manually check it. Nice work ! Is the tool open-source ? > Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com> > --- > drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c > b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c index b2431ae..2cf7fa1 > 100644 > --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c > +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c > @@ -1054,7 +1054,7 @@ static int adv7511_probe(struct i2c_client *i2c, const > struct i2c_device_id *id) } > > if (adv7511->gpio_pd) { > - mdelay(5); > + usleep_range(5000, 6000); > gpiod_set_value_cansleep(adv7511->gpio_pd, 0); > } The patch looks good to me. Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com> -- Regards, Laurent Pinchart
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