linux-kernel - Re: [PATCHv2 08/10] rfkill: Use switch to demux userspace operations

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Message-ID: <20160226175925.GA9331@w1.fi>
Date:	Fri, 26 Feb 2016 19:59:25 +0200
From:	Jouni Malinen <j@...fi>
To:	João Paulo Rechi Vita <jprvita@...il.com>
Cc:	Johannes Berg <johannes@...solutions.net>,
	"David S. Miller" <davem@...emloft.net>,
	Darren Hart <dvhart@...radead.org>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	platform-driver-x86@...r.kernel.org, linux-api@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux@...lessm.com,
	João Paulo Rechi Vita <jprvita@...lessm.com>
Subject: Re: [PATCHv2 08/10] rfkill: Use switch to demux userspace operations

On Mon, Feb 22, 2016 at 11:36:39AM -0500, João Paulo Rechi Vita wrote:
> Using a switch to handle different ev.op values in rfkill_fop_write()
> makes the code easier to extend, as out-of-range values can always be
> handled by the default case.

This breaks rfkill.. There are automated test scripts for testing this
area (and most of Wi-Fi for that matter. It would be nice if these were
used for changes before they get contributed upstream..

http://buildbot.w1.fi/hwsim/

This specific commit broke all the rfkill_* test cases because of
following:

> diff --git a/net/rfkill/core.c b/net/rfkill/core.c
> @@ -1199,29 +1200,32 @@ static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
> -	list_for_each_entry(rfkill, &rfkill_list, node) {
> -		if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
> -			continue;
> -
> -		if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
> -			continue;

Note that RFKILL_TYPE_ALL here..

> +		list_for_each_entry(rfkill, &rfkill_list, node)
> +			if (rfkill->type == ev.type ||
> +			    ev.type == RFKILL_TYPE_ALL)
> +				rfkill_set_block(rfkill, ev.soft);

It was included for RFKILL_OP_CHANGE_ALL.

> +	case RFKILL_OP_CHANGE:
> +		list_for_each_entry(rfkill, &rfkill_list, node)
> +			if (rfkill->idx == ev.idx && rfkill->type == ev.type)
> +				rfkill_set_block(rfkill, ev.soft);

but not for RFKILL_OP_CHANGE..

This needs following to work:


diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index 59ff92d..c4bbd19 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -1239,7 +1239,9 @@ static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
 		break;
 	case RFKILL_OP_CHANGE:
 		list_for_each_entry(rfkill, &rfkill_list, node)
-			if (rfkill->idx == ev.idx && rfkill->type == ev.type)
+			if (rfkill->idx == ev.idx &&
+			    (rfkill->type == ev.type ||
+			     ev.type == RFKILL_TYPE_ALL))
 				rfkill_set_block(rfkill, ev.soft);
 		ret = 0;
 		break;
 
-- 
Jouni Malinen                                            PGP id EFC895FA