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SubjectRe: [PATCH v6 05/10] drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS
On Thu, Apr 19, 2018 at 04:16:30PM -0600, Lina Iyer wrote:
> Sleep and wake requests are sent when the application processor
> subsystem of the SoC is entering deep sleep states like in suspend.
> These requests help lower the system power requirements when the
> resources are not in use.
>
> Sleep and wake requests are written to the TCS slots but are not
> triggered at the time of writing. The TCS are triggered by the firmware
> after the last of the CPUs has executed its WFI. Since these requests
> may come in different batches of requests, it is the job of this
> controller driver to find and arrange the requests into the available
> TCSes.
>
> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
> Reviewed-by: Evan Green <evgreen@chromium.org>
> ---
> drivers/soc/qcom/rpmh-internal.h | 8 +++
> drivers/soc/qcom/rpmh-rsc.c | 120 +++++++++++++++++++++++++++++++
> 2 files changed, 128 insertions(+)
>
> diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h
> index d9a21726e568..6e19fe458c31 100644
> --- a/drivers/soc/qcom/rpmh-internal.h
> +++ b/drivers/soc/qcom/rpmh-internal.h

<snip>

> +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) {
> + for (j = 0; j < len; j++) {
> + if (tcs->cmd_cache[i] != cmd[0].addr) {

Shouldn't the condition be 'tcs->cmd_cache[i + j] != cmd[j].addr'?

Otherwise the code below the following if branch will never be
executed. Either the 'tcs->cmd_cache[i] != cmd[0].addr' branch isn't
entered because the addresses match, or the addresses don't match
and the inner loop is aborted after the first iteration.

> + if (j == 0)
> + break;
> + WARN(tcs->cmd_cache[i + j] != cmd[j].addr,
> + "Message does not match previous sequence.\n");
> + return -EINVAL;
> + } else if (j == len - 1) {
> + return i;
> + }
> + }
> + }
> +
> + return -ENODATA;
> +}

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