linux-kernel - Re: [PATCH V1 02/15] spmi: pmic-arb: rename spmi_pmic_arb_dev to spmi_pmic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20170602182946.GO20170@codeaurora.org>
Date:   Fri, 2 Jun 2017 11:29:46 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     kgunda@...eaurora.org
Cc:     Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Collins <collinsd@...eaurora.org>,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        adharmap@...cinc.com, aghayal@....qualcomm.com,
        linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V1 02/15] spmi: pmic-arb: rename spmi_pmic_arb_dev to
 spmi_pmic_arb

On 06/01, kgunda@...eaurora.org wrote:
> >>@@ -209,23 +210,24 @@ static void pa_read_data(struct
> >>spmi_pmic_arb_dev *dev, u8 *buf, u32 reg, u8 bc)
> >>  * @buf:	buffer to write. length must be bc + 1.
> >>  */
> >> static void
> >>-pa_write_data(struct spmi_pmic_arb_dev *dev, const u8 *buf, u32
> >>reg, u8 bc)
> >>+pa_write_data(struct spmi_pmic_arb *pa, const u8 *buf, u32 reg,
> >>u8 bc)
> >> {
> >> 	u32 data = 0;
> >>+
> >> 	memcpy(&data, buf, (bc & 3) + 1);
> >>-	__raw_writel(data, dev->wr_base + reg);
> >>+	pmic_arb_base_write(pa, reg, data);
> >
> >This is an unrelated change. Not sure what's going on with this
> >diff but we most likely want to keep the __raw_writel() here. See
> >how renames introduce bugs and why we don't value them?
> >
> Actually pmic_arb_base_write has the writel_relaxed inside it.
> that's why we removed the __raw_writel to use the common function.
> Anyways, we drop the renaming patch from this patch series.

__raw_writel() is there on purpose because we're reading bytes at
a time and the CPU could be big-endian or little-endian.
readl_relaxed() would do a byte swap which we don't want.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project