linux-kernel - Re: [PATCH 2/3] Add rfkill support to compal-laptop

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Date:	Tue, 18 Aug 2009 22:17:03 +0100
From:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
To:	Mario Limonciello <mario_limonciello@...l.com>
Cc:	Marcel Holtmann <marcel@...tmann.org>, cezary.jackiewicz@...il.com,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] Add rfkill support to compal-laptop

On 8/18/09, Mario Limonciello <mario_limonciello@...l.com> wrote:
> Hi Alan & Marcel:
>
> Alan Jenkins wrote:
>> Also, you're missing the calls to rfkill_destroy() here.
>>
>> Whew, I think that's everything.  I hope you find the feedback useful,
>> despite it being a little fragmented.
>>
>>
> Thanks for all the feedback.  I think i've addressed all of the concerns
> that were pointed out.  I appreciate the pointer to scripts/cleanpatch,
> that does significantly help in finding whitespace problems that the
> naked eye just browses over.

I think you've addressed most of the comments on your first patch.
There are still problems with the error handling though.

+static int setup_rfkill(void)
+{
+	int ret;
+
+	wifi_rfkill = rfkill_alloc("compal-wifi", &compal_device->dev,
+				RFKILL_TYPE_WLAN, &compal_rfkill_ops,
+				(void *) WLAN_MASK);
+	if (!wifi_rfkill) {
+		ret = -ENOMEM;
+		goto err_wifi;
+	}
+	ret = rfkill_register(wifi_rfkill);
+	if (ret) {
+		rfkill_unregister(wifi_rfkill);
+		goto err_wifi;
+	}

If you fail to register an rfkill device, you don't need to unregister
that rfkill device...

+
+	bt_rfkill = rfkill_alloc("compal-bluetooth", &compal_device->dev,
+				RFKILL_TYPE_BLUETOOTH, &compal_rfkill_ops,
+				(void *) BT_MASK);
+	if (!bt_rfkill) {
+		ret = -ENOMEM;
+		goto err_bt;
+	}
+	ret = rfkill_register(bt_rfkill);
+	if (ret) {
+		rfkill_unregister(bt_rfkill);
+		goto err_bt;
+	}

and the same applies here

+
+	return 0;
+
+err_bt:
+	rfkill_destroy(bt_rfkill);
+

... but you *do* need to unregister wifi_rfkill here, before you go on
to destroy it.

+err_wifi:
+	rfkill_destroy(wifi_rfkill);
+
+	return ret;
+}

Regards
Alan
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