linux-kernel - Re: [PATCH 2/3] Revert "i2c: i2c-qcom-geni: Fix DMA transfer race"

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: <9bd20b68-1466-ea3d-2ba3-1b35d9b324ab@codeaurora.org>
Date:   Mon, 12 Oct 2020 13:42:43 +0530
From:   Akash Asthana <akashast@...eaurora.org>
To:     Douglas Anderson <dianders@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Wolfram Sang <wsa@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        linux-i2c@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Mukesh Savaliya <msavaliy@...eaurora.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] Revert "i2c: i2c-qcom-geni: Fix DMA transfer race"


On 10/9/2020 4:22 AM, Douglas Anderson wrote:
> This reverts commit 02b9aec59243c6240fc42884acc958602146ddf6.
>
> As talked about in the patch ("soc: qcom: geni: More properly switch
> to DMA mode"), swapping the order of geni_se_setup_m_cmd() and
> geni_se_xx_dma_prep() can sometimes cause corrupted transfers.  Thus
> we traded one problem for another.  Now that we've debugged the
> problem further and fixed the geni helper functions to more disable
> FIFO interrupts when we move to DMA mode we can revert it and end up
> with (hopefully) zero problems!
>
> To be explicit, the patch ("soc: qcom: geni: More properly switch
> to DMA mode") is a prerequisite for this one.
>
> Fixes: 02b9aec59243 ("i2c: i2c-qcom-geni: Fix DMA transfer race")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Akash Asthana <akashast@...eaurora.org>

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