linux-kernel - [PATCH] staging:r8192u: replace request_module with try_then_request

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Date:   Sun, 10 Sep 2017 21:34:28 +0300
From:   Ivan Safonov <insafonov@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     simran singhal <singhalsimran0@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Colin Ian King <colin.king@...onical.com>,
        Julia Lawall <julia.lawall@...6.fr>,
        Ivan Safonov <insafonov@...il.com>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] staging:r8192u: replace request_module with try_then_request_module

Return value of request_module() does not handled,
so it is possible to use shorter try_then_request_module().

Signed-off-by: Ivan Safonov <insafonov@...il.com>
---
 .../staging/rtl8192u/ieee80211/ieee80211_softmac.c | 27 +++++++++++-----------
 drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c  | 15 ++++--------
 2 files changed, 17 insertions(+), 25 deletions(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
index fe6f38b7ec35..4e7908322d77 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c
@@ -2948,8 +2948,9 @@ static int ieee80211_wpa_set_encryption(struct ieee80211_device *ieee,
 				  struct ieee_param *param, int param_len)
 {
 	int ret = 0;
+	const char *module = NULL;
 
-	struct ieee80211_crypto_ops *ops;
+	struct ieee80211_crypto_ops *ops = NULL;
 	struct ieee80211_crypt_data **crypt;
 
 	struct ieee80211_security sec = {
@@ -2995,19 +2996,17 @@ static int ieee80211_wpa_set_encryption(struct ieee80211_device *ieee,
 	    strcmp(param->u.crypt.alg, "TKIP"))
 		goto skip_host_crypt;
 
-	ops = ieee80211_get_crypto_ops(param->u.crypt.alg);
-	if (ops == NULL && strcmp(param->u.crypt.alg, "WEP") == 0) {
-		request_module("ieee80211_crypt_wep");
-		ops = ieee80211_get_crypto_ops(param->u.crypt.alg);
-		//set WEP40 first, it will be modified according to WEP104 or WEP40 at other place
-	} else if (ops == NULL && strcmp(param->u.crypt.alg, "TKIP") == 0) {
-		request_module("ieee80211_crypt_tkip");
-		ops = ieee80211_get_crypto_ops(param->u.crypt.alg);
-	} else if (ops == NULL && strcmp(param->u.crypt.alg, "CCMP") == 0) {
-		request_module("ieee80211_crypt_ccmp");
-		ops = ieee80211_get_crypto_ops(param->u.crypt.alg);
-	}
-	if (ops == NULL) {
+	//set WEP40 first, it will be modified according to WEP104 or WEP40 at other place
+	if (!strcmp(param->u.crypt.alg, "WEP"))
+		module = "ieee80211_crypt_wep";
+	else if (!strcmp(param->u.crypt.alg, "TKIP"))
+		module = "ieee80211_crypt_tkip";
+	else if (!strcmp(param->u.crypt.alg, "CCMP"))
+		module = "ieee80211_crypt_ccmp";
+	if (module)
+		ops = try_then_request_module(ieee80211_get_crypto_ops(param->u.crypt.alg),
+					      module);
+	if (!ops) {
 		printk("unknown crypto alg '%s'\n", param->u.crypt.alg);
 		param->u.crypt.err = IEEE_CRYPT_ERR_UNKNOWN_ALG;
 		ret = -EINVAL;
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
index c925e53bf013..f2fcdec9bd17 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
@@ -364,11 +364,8 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
 				    GFP_KERNEL);
 		if (!new_crypt)
 			return -ENOMEM;
-		new_crypt->ops = ieee80211_get_crypto_ops("WEP");
-		if (!new_crypt->ops) {
-			request_module("ieee80211_crypt_wep");
-			new_crypt->ops = ieee80211_get_crypto_ops("WEP");
-		}
+		new_crypt->ops = try_then_request_module(ieee80211_get_crypto_ops("WEP"),
+							 "ieee80211_crypt_wep");
 		if (new_crypt->ops && try_module_get(new_crypt->ops->owner))
 			new_crypt->priv = new_crypt->ops->init(key);
 
@@ -591,12 +588,8 @@ int ieee80211_wx_set_encode_ext(struct ieee80211_device *ieee,
 	}
 	printk("alg name:%s\n",alg);
 
-	 ops = ieee80211_get_crypto_ops(alg);
-	if (ops == NULL) {
-		request_module(module);
-		ops = ieee80211_get_crypto_ops(alg);
-	}
-	if (ops == NULL) {
+	ops = try_then_request_module(ieee80211_get_crypto_ops(alg), module);
+	if (!ops) {
 		IEEE80211_DEBUG_WX("%s: unknown crypto alg %d\n",
 				   dev->name, ext->alg);
 		printk("========>unknown crypto alg %d\n", ext->alg);
-- 
2.13.5