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References: <20211226153624.162281-1-marcan@marcan.st> <20211226153624.162281-29-marcan@marcan.st>
In-Reply-To: <20211226153624.162281-29-marcan@marcan.st>
From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Sun, 2 Jan 2022 07:15:03 +0100
Message-ID: <CACRpkdYGQkTEHFNtLB=gMV-jkPWiF8mjUVv_C_rTyd7bxrYcXA@mail.gmail.com>
Subject: Re: [PATCH 28/34] brcmfmac: pcie: Replace brcmf_pcie_copy_mem_todev
 with memcpy_toio
To:     Hector Martin <marcan@marcan.st>
Cc:     Kalle Valo <kvalo@codeaurora.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Chi-hsien Lin <chi-hsien.lin@infineon.com>,
        Wright Feng <wright.feng@infineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@infineon.com>,
        Sven Peter <sven@svenpeter.dev>,
        Alyssa Rosenzweig <alyssa@rosenzweig.io>,
        Mark Kettenis <kettenis@openbsd.org>,
        =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>,
        Hans de Goede <hdegoede@redhat.com>,
        "John W. Linville" <linville@tuxdriver.com>,
        "Daniel (Deognyoun) Kim" <dekim@broadcom.com>,
        "brian m. carlson" <sandals@crustytoothpaste.net>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-acpi@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com,
        SHA-cyfmac-dev-list@infineon.com
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On Sun, Dec 26, 2021 at 4:40 PM Hector Martin <marcan@marcan.st> wrote:

> The alignment check was wrong (e.g. & 4 instead of & 3), and the logic
> was also inefficient if the length was not a multiple of 4, since it
> would needlessly fall back to copying the entire buffer bytewise.
>
> We already have a perfectly good memcpy_toio function, so just call that
> instead of rolling our own copy logic here. brcmf_pcie_init_ringbuffers
> was already using it anyway.
>
> Fixes: 9e37f045d5e7 ("brcmfmac: Adding PCIe bus layer support.")
> Signed-off-by: Hector Martin <marcan@marcan.st>

Excellent patch.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij