Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 25 Jan 2018 07:31:15 -0800
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_it821x: Replace mdelay with usleep_range in
 it821x_firmware_command
Message-ID: <20180125153115.GF17457@devbig577.frc2.facebook.com>
References: <1516876379-12834-1-git-send-email-baijiaju1990@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1516876379-12834-1-git-send-email-baijiaju1990@gmail.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Jan 25, 2018 at 06:32:59PM +0800, Jia-Ju Bai wrote:
> After checking all possible call chains to it821x_firmware_command here,
> my tool finds that it821x_firmware_command 
> is never called in atomic context,
> namely never in an interrupt handler or holding a spinlock.
> And it821x_firmware_command calls kmalloc(GFP_KERNEL), 
> so it proves again that it821x_firmware_command 
> can call functions which can sleep.
> Thus mdelay can be replaced with usleep_range to avoid busy wait.
> 
> This is found by a static analysis tool named DCNS written by myself.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>

Applied to libata/for-4.16.

Thanks.

-- 
tejun