linux-kernel - [PATCH 3/3] drivers/staging/rtl8192u: Don't pass huge struct by value

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Message-ID: <alpine.LNX.2.00.1108130101190.7387@swampdragon.chaosbits.net>
Date:	Sat, 13 Aug 2011 01:04:53 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Greg Kroah-Hartman <gregkh@...e.de>
cc:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Larry Finger <Larry.Finger@...inger.net>,
	Stefan Weil <weil@...l.berlios.de>,
	Stefan Weil <weil@...l.berlios.de>,
	David Chosrova <dada2372@...il.com>,
	Andrea Merello <andreamrl@...cali.it>, netdev@...r.kernel.org
Subject: [PATCH 3/3] drivers/staging/rtl8192u: Don't pass huge struct by
 value

From: Jesper Juhl <jj@...osbits.net>
Date: Sat, 13 Aug 2011 00:53:07 +0200

struct ieee80211_network is fairly large (more than half a kilobyte),
so let's pass a pointer instead of passing the entire structure by
value when ieee80211_is_54g() and ieee80211_is_shortslot() need to
look at a few members.
Also remove parentheses around the values being returned from those
two functions - 'return' is not a function.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 drivers/staging/rtl8192u/ieee80211/ieee80211.h     |    4 ++--
 .../staging/rtl8192u/ieee80211/ieee80211_softmac.c |   14 +++++++-------
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211.h b/drivers/staging/rtl8192u/ieee80211/ieee80211.h
index 463cc26..1c0a1db 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211.h
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211.h
@@ -2416,8 +2416,8 @@ extern int ieee80211_wx_set_mlme(struct ieee80211_device *ieee,
 extern int ieee80211_wx_set_gen_ie(struct ieee80211_device *ieee, u8 *ie, size_t len);
 
 /* ieee80211_softmac.c */
-extern short ieee80211_is_54g(struct ieee80211_network net);
-extern short ieee80211_is_shortslot(struct ieee80211_network net);
+extern short ieee80211_is_54g(const struct ieee80211_network *net);
+extern short ieee80211_is_shortslot(const struct ieee80211_network *net);
 extern int ieee80211_rx_frame_softmac(struct ieee80211_device *ieee, struct sk_buff *skb,
 			struct ieee80211_rx_stats *rx_stats, u16 type,
 			u16 stype);
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
index b00eb0e..c2ab5fa 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
@@ -31,14 +31,14 @@ u8 rsn_authen_cipher_suite[16][4] = {
 	{0x00,0x0F,0xAC,0x05}, //WEP-104
 };
 
-short ieee80211_is_54g(struct ieee80211_network net)
+short ieee80211_is_54g(const struct ieee80211_network *net)
 {
-	return ((net.rates_ex_len > 0) || (net.rates_len > 4));
+	return (net->rates_ex_len > 0) || (net->rates_len > 4);
 }
 
-short ieee80211_is_shortslot(struct ieee80211_network net)
+short ieee80211_is_shortslot(const struct ieee80211_network *net)
 {
-	return (net.capability & WLAN_CAPABILITY_SHORT_SLOT);
+	return net->capability & WLAN_CAPABILITY_SHORT_SLOT;
 }
 
 /* returns the total length needed for pleacing the RATE MFIE
@@ -718,7 +718,7 @@ static struct sk_buff* ieee80211_probe_resp(struct ieee80211_device *ieee, u8 *d
 	else
 		atim_len = 0;
 
-	if(ieee80211_is_54g(ieee->current_network))
+	if(ieee80211_is_54g(&ieee->current_network))
 		erp_len = 3;
 	else
 		erp_len = 0;
@@ -1333,7 +1333,7 @@ void ieee80211_associate_complete_wq(struct work_struct *work)
 {
 	struct ieee80211_device *ieee = container_of(work, struct ieee80211_device, associate_complete_wq);
 	printk(KERN_INFO "Associated successfully\n");
-	if(ieee80211_is_54g(ieee->current_network) &&
+	if(ieee80211_is_54g(&ieee->current_network) &&
 		(ieee->modulation & IEEE80211_OFDM_MODULATION)){
 
 		ieee->rate = 108;
@@ -1489,7 +1489,7 @@ inline void ieee80211_softmac_new_net(struct ieee80211_device *ieee, struct ieee
 					ieee->state = IEEE80211_ASSOCIATING;
 					queue_work(ieee->wq, &ieee->associate_procedure_wq);
 				}else{
-					if(ieee80211_is_54g(ieee->current_network) &&
+					if(ieee80211_is_54g(&ieee->current_network) &&
 						(ieee->modulation & IEEE80211_OFDM_MODULATION)){
 						ieee->rate = 108;
 						ieee->SetWirelessMode(ieee->dev, IEEE_G);
-- 
1.7.6


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
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