linux-kernel - Re: [PATCH v6 05/10] drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS

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Date:   Tue, 1 May 2018 09:42:55 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Lina Iyer <ilina@...eaurora.org>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-arm-msm@...r.kernel.org,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Evan Green <evgreen@...omium.org>
Subject: Re: [PATCH v6 05/10] drivers: qcom: rpmh-rsc: write sleep/wake
 requests to TCS

Hi,

On Tue, May 1, 2018 at 9:10 AM, Lina Iyer <ilina@...eaurora.org> wrote:
> Yes, this is incorrect in its current form. This is what it should be -
>
> static int find_match(const struct tcs_group *tcs, const struct tcs_cmd
> *cmd,
>                      int len)
> {
>        int i, j;
>
>        /* Check for already cached commands */
>        for_each_set_bit(i, tcs->slots, MAX_TCS_SLOTS) {
>                if (tcs->cmd_cache[i] != cmd[0].addr)
>                        continue;
>                for (j = 0; j < len; j++) {
>                        WARN(tcs->cmd_cache[i + j] != cmd[j].addr,
>                             "Message does not match previous sequence.\n");
>                        return -EINVAL;
>                }

If len > 0, won't the above always return -EINVAL?


>                if (j == len - 1)
>                        return i;

Care to explain how you could get here and the test "if (j == len -
1)" could be false?  ;-P

-Doug