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From: Mark Brown <broonie@kernel.org>
To: Sagar Dharia <sdharia@codeaurora.org>
Cc: gregkh@linuxfoundation.org, bp@suse.de, poeschel@lemonage.de,
	treding@nvidia.com, gong.chen@linux.intel.com,
	andreas.noever@gmail.com, alan@linux.intel.com,
	mathieu.poirier@linaro.org, daniel@ffwll.ch, oded.gabbay@amd.com,
	jkosina@suse.cz, sharon.dvir1@mail.huji.ac.il, joe@perches.com,
	davem@davemloft.net, james.hogan@imgtec.com,
	michael.opdenacker@free-electrons.com,
	daniel.thompson@linaro.org, robh+dt@kernel.org,
	pawel.moll@arm.com, mark.rutland@arm.com,
	ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	kheitke@audience.com, mlocke@codeaurora.org,
	agross@codeaurora.org, linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH V4 3/6] slimbus: Add messaging APIs to slimbus framework
Date: Sat, 5 Mar 2016 14:13:25 +0900	[thread overview]
Message-ID: <20160305051325.GD18327@sirena.org.uk> (raw)
In-Reply-To: <1454784265-5194-4-git-send-email-sdharia@codeaurora.org>

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On Sat, Feb 06, 2016 at 11:44:22AM -0700, Sagar Dharia wrote:

> +	spin_lock_irqsave(&ctrl->txn_lock, flags);
> +	msg = ctrl->tid_tbl[tid];
> +	if (msg == NULL || msg->rbuf == NULL) {
> +		spin_unlock_irqrestore(&ctrl->txn_lock, flags);
> +		dev_err(&ctrl->dev, "Got response to invalid TID:%d, len:%d\n",
> +				tid, len);
> +		return;
> +	}
> +	memcpy(msg->rbuf, reply, len);
> +	ctrl->tid_tbl[tid] = NULL;
> +	if (msg->comp_cb)
> +		msg->comp_cb(msg->ctx, 0);
> +	spin_unlock_irqrestore(&ctrl->txn_lock, flags);

Do we need to hold the lock for so long (especially with things like the
memcpy())?  As far as I can tell we only need the lock for this:

> +	msg = ctrl->tid_tbl[tid];
> +	ctrl->tid_tbl[tid] = NULL;

> +	if (mc == SLIM_MSG_MC_REQUEST_CHANGE_VALUE ||
> +		mc == SLIM_MSG_MC_CHANGE_VALUE ||
> +		mc == SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION ||
> +		mc == SLIM_MSG_MC_CLEAR_INFORMATION)
> +		txn->rl += msg->num_bytes;

A switch statement might be nicer here.

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  reply	other threads:[~2016-03-05  5:13 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-06 18:44 [PATCH V4 0/6] Introduce framework for SLIMbus device drivers Sagar Dharia
2016-02-06 18:44 ` Sagar Dharia
     [not found] ` <1454784265-5194-1-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-02-06 18:44   ` [PATCH V4 1/6] SLIMbus: Device management on SLIMbus Sagar Dharia
2016-02-06 18:44     ` Sagar Dharia
     [not found]     ` <1454784265-5194-2-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-05  5:01       ` Mark Brown
2016-03-05  5:01         ` Mark Brown
2016-02-06 18:44 ` [PATCH V4 2/6] of/slimbus: OF helper for SLIMbus Sagar Dharia
2016-02-08 20:24   ` Rob Herring
2016-02-06 18:44 ` [PATCH V4 3/6] slimbus: Add messaging APIs to slimbus framework Sagar Dharia
2016-03-05  5:13   ` Mark Brown [this message]
2016-02-06 18:44 ` [PATCH V4 4/6] slim: qcom: Add Qualcomm Slimbus controller driver Sagar Dharia
2016-02-08 20:26   ` Rob Herring
     [not found]   ` <1454784265-5194-5-git-send-email-sdharia-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-05  5:23     ` Mark Brown
2016-03-05  5:23       ` Mark Brown
2016-04-15 16:17       ` Sagar Dharia
2016-04-18  9:19         ` Mark Brown
2016-04-18 22:42           ` Sagar Dharia
2016-02-06 18:44 ` [PATCH V4 5/6] slimbus: Add support for 'clock-pause' feature Sagar Dharia
2016-02-06 18:44 ` [PATCH V4 6/6] slim: qcom: Add runtime-pm support using clock-pause feature Sagar Dharia
2016-03-05  5:29   ` Mark Brown
2016-03-05  5:31 ` [PATCH V4 0/6] Introduce framework for SLIMbus device drivers Mark Brown

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