From: Stephen Boyd <swboyd@chromium.org>
To: Roja Rani Yarubandi <rojay@codeaurora.org>, wsa@kernel.org
Cc: dianders@chromium.org, saiprakash.ranjan@codeaurora.org,
gregkh@linuxfoundation.org, mka@chromium.org,
akashast@codeaurora.org, msavaliy@qti.qualcomm.com,
skakit@codeaurora.org, vkaur@codeaurora.org,
pyarlaga@codeaurora.org, rnayak@codeaurora.org,
agross@kernel.org, bjorn.andersson@linaro.org,
linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org,
linux-kernel@vger.kernel.org, sumit.semwal@linaro.org,
linux-media@vger.kernel.org,
Roja Rani Yarubandi <rojay@codeaurora.org>
Subject: Re: [PATCH V5 3/3] i2c: i2c-qcom-geni: Add shutdown callback for i2c
Date: Fri, 02 Oct 2020 18:39:53 -0700 [thread overview]
Message-ID: <160168919332.310579.15311671258384969025@swboyd.mtv.corp.google.com> (raw)
In-Reply-To: <20201001084425.23117-4-rojay@codeaurora.org>
Quoting Roja Rani Yarubandi (2020-10-01 01:44:25)
> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> index aee2a1dd2c62..56d3fbfe7eb6 100644
> --- a/drivers/i2c/busses/i2c-qcom-geni.c
> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> @@ -380,6 +380,36 @@ static void geni_i2c_tx_msg_cleanup(struct geni_i2c_dev *gi2c,
> }
> }
>
> +static void geni_i2c_stop_xfer(struct geni_i2c_dev *gi2c)
> +{
> + int ret;
> + u32 geni_status;
> + unsigned long flags;
> + struct i2c_msg *cur;
> +
> + /* Resume device, runtime suspend can happen anytime during transfer */
> + ret = pm_runtime_get_sync(gi2c->se.dev);
> + if (ret < 0) {
> + dev_err(gi2c->se.dev, "Failed to resume device: %d\n", ret);
> + return;
> + }
> +
> + spin_lock_irqsave(&gi2c->lock, flags);
We grab the lock here.
> + geni_status = readl_relaxed(gi2c->se.base + SE_GENI_STATUS);
> + if (!(geni_status & M_GENI_CMD_ACTIVE))
> + goto out;
> +
> + cur = gi2c->cur;
> + geni_i2c_abort_xfer(gi2c);
But it looks like this function takes the lock again? Did you test this
with lockdep enabled? It should hang even without lockdep, so it seems
like this path of code has not been tested.
> + if (cur->flags & I2C_M_RD)
> + geni_i2c_rx_msg_cleanup(gi2c, cur);
> + else
> + geni_i2c_tx_msg_cleanup(gi2c, cur);
> + spin_unlock_irqrestore(&gi2c->lock, flags);
> +out:
> + pm_runtime_put_sync_suspend(gi2c->se.dev);
> +}
> +
> static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
> u32 m_param)
> {
next prev parent reply other threads:[~2020-10-03 1:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-01 8:44 [PATCH V5 0/3] Implement Shutdown callback for geni-i2c Roja Rani Yarubandi
2020-10-01 8:44 ` [PATCH V5 1/3] soc: qcom: geni: Remove "iova" check Roja Rani Yarubandi
2020-10-02 21:50 ` Stephen Boyd
2020-10-08 13:04 ` Wolfram Sang
2020-10-01 8:44 ` [PATCH V5 2/3] i2c: i2c-qcom-geni: Store DMA mapping data in geni_i2c_dev struct Roja Rani Yarubandi
2020-10-01 8:44 ` [PATCH V5 3/3] i2c: i2c-qcom-geni: Add shutdown callback for i2c Roja Rani Yarubandi
2020-10-03 1:39 ` Stephen Boyd [this message]
2020-10-30 14:59 ` rojay
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=160168919332.310579.15311671258384969025@swboyd.mtv.corp.google.com \
--to=swboyd@chromium.org \
--cc=agross@kernel.org \
--cc=akashast@codeaurora.org \
--cc=bjorn.andersson@linaro.org \
--cc=dianders@chromium.org \
--cc=gregkh@linuxfoundation.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=mka@chromium.org \
--cc=msavaliy@qti.qualcomm.com \
--cc=pyarlaga@codeaurora.org \
--cc=rnayak@codeaurora.org \
--cc=rojay@codeaurora.org \
--cc=saiprakash.ranjan@codeaurora.org \
--cc=skakit@codeaurora.org \
--cc=sumit.semwal@linaro.org \
--cc=vkaur@codeaurora.org \
--cc=wsa@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).