From: Tejun Heo <tj@kernel.org>
To: Jia-Ju Bai <baijiaju1990@gmail.com>
Cc: b.zolnierkie@samsung.com, linux-ide@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ata: pata_pdc2027x: Replace mdelay with msleep
Date: Thu, 25 Jan 2018 07:30:55 -0800 [thread overview]
Message-ID: <20180125153055.GE17457@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <1516877105-13081-1-git-send-email-baijiaju1990@gmail.com>
On Thu, Jan 25, 2018 at 06:45:05PM +0800, Jia-Ju Bai wrote:
> After checking all possible call chains to pdc_adjust_pll and
> pdc_detect_pll_input_clock,
> my tool finds that these functions are never called in atomic context,
> namely never in an interrupt handler or holding a spinlock.
> And their caller functions pdc2027x_init_one and pdc2027x_reinit_one
> calls pci_enable_device which can sleep, and no spinlock is held when
> calling pdc_adjust_pll and pdc_detect_pll_input_clock,
> so it proves that pdc_adjust_pll and pdc_detect_pll_input_clock
> can call functions which can sleep.
> Thus mdelay can be replaced with msleep to avoid busy wait.
>
> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Applied to libata/for-4.16.
Thanks.
--
tejun
prev parent reply other threads:[~2018-01-25 15:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-25 10:45 [PATCH] ata: pata_pdc2027x: Replace mdelay with msleep Jia-Ju Bai
2018-01-25 15:30 ` Tejun Heo [this message]
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