linux-kernel - Re: [PATCHv4] remoteproc: Add STE modem driver for remoteproc

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Message-ID: <CAK=WgbYMjeGb7X9V7G-27iL=p4PhAL+CFsJxAo=F7LJ+2c0fCg@mail.gmail.com>
Date:	Sat, 22 Sep 2012 16:28:31 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Sjur Brændeland <sjurbren@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCHv4] remoteproc: Add STE modem driver for remoteproc

Hi Sjur,

On Sat, Sep 22, 2012 at 2:38 PM, Sjur Brændeland <sjurbren@...il.com> wrote:
>> It might be safer though to invoke ->setup() in probe/remove, instead
>> of in start/stop (just like you essentially did before).
>>
>> This way we don't assume that stop is always called before remove (as
>> assumption that might be implicitly valid today, but may break in the
>> future).
>>
>> If you want, I can just change that before applying.
>
> Sounds good, please just go ahead and change this before applying.
> Thank you.

I'm going to squash the below into the patch - please ack before I
apply and push - thanks!

diff --git a/drivers/remoteproc/ste_modem_rproc.c
b/drivers/remoteproc/ste_modem_rproc.c
index fcc8677..a7743c0 100644
--- a/drivers/remoteproc/ste_modem_rproc.c
+++ b/drivers/remoteproc/ste_modem_rproc.c
@@ -190,9 +190,6 @@ static int sproc_start(struct rproc *rproc)

 	sproc_dbg(sproc, "start ste-modem\n");

-	/* Provide callback functions to modem device */
-	sproc->mdev->ops.setup(sproc->mdev, &sproc_dev_cb);
-
 	/* Sanity test the max_notifyid */
 	if (rproc->max_notifyid > SPROC_MAX_NOTIFY_ID) {
 		sproc_err(sproc, "Notification IDs too high:%d\n",
@@ -220,9 +217,6 @@ static int sproc_stop(struct rproc *rproc)
 	struct sproc *sproc = rproc->priv;
 	sproc_dbg(sproc, "stop ste-modem\n");

-	/* Reset device callback functions */
-	sproc->mdev->ops.setup(sproc->mdev, NULL);
-
 	return sproc->mdev->ops.power(sproc->mdev, false);
 }

@@ -241,6 +235,9 @@ static int sproc_drv_remove(struct platform_device *pdev)

 	sproc_dbg(sproc, "remove ste-modem\n");

+	/* Reset device callback functions */
+	sproc->mdev->ops.setup(sproc->mdev, NULL);
+
 	/* Unregister as remoteproc device */
 	rproc_del(sproc->rproc);
 	rproc_put(sproc->rproc);
@@ -260,6 +257,13 @@ static int sproc_probe(struct platform_device *pdev)
 	int err;

 	dev_dbg(&mdev->pdev.dev, "probe ste-modem\n");
+
+	if (!mdev->ops.setup || !mdev->ops.kick || !mdev->ops.kick_subscribe ||
+	    !mdev->ops.power) {
+		dev_err(&mdev->pdev.dev, "invalid mdev ops\n");
+		return -EINVAL;
+	}
+
 	rproc = rproc_alloc(&mdev->pdev.dev, mdev->pdev.name, &sproc_ops,
 			    SPROC_MODEM_FIRMWARE, sizeof(*sproc));
 	if (!rproc)
@@ -270,6 +274,9 @@ static int sproc_probe(struct platform_device *pdev)
 	sproc->rproc = rproc;
 	mdev->drv_data = sproc;

+	/* Provide callback functions to modem device */
+	sproc->mdev->ops.setup(sproc->mdev, &sproc_dev_cb);
+
 	/* Set the STE-modem specific firmware handler */
 	rproc->fw_ops = &sproc_fw_ops;
--
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