[PATCH] rtlwifi: rtl8192cu: remove pointless memcpy

Subsystems: realtek wireless driver (rtlwifi family), the rest

STALE3096d

5 messages, 4 authors, 2018-02-27 · open the first message on its own page

[PATCH] rtlwifi: rtl8192cu: remove pointless memcpy

From: Arnd Bergmann <arnd@arndb.de>
Date: 2018-02-09 13:25:56

gcc-8 points out that source and destination of the memcpy() are
always the same pointer, so the effect of memcpy() is undefined
here (its arguments must not overlap):

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c: In function '_rtl_rx_process':
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c:430:2: error: 'memcpy' source argument is the same as destination [-Werror=restrict]

Most likely this is harmless, but it's easy to just remove the
line and get rid of the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
index ac4a82de40c7..9ab56827124e 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c

@@ -427,7 +427,6 @@ static void _rtl_rx_process(struct ieee80211_hw *hw, struct sk_buff *skb)
 		 (u32)hdr->addr1[0], (u32)hdr->addr1[1],
 		 (u32)hdr->addr1[2], (u32)hdr->addr1[3],
 		 (u32)hdr->addr1[4], (u32)hdr->addr1[5]);
-	memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
 	ieee80211_rx(hw, skb);
 }

-- 
2.9.0

Re: [PATCH] rtlwifi: rtl8192cu: remove pointless memcpy

From: Joe Perches <joe@perches.com>
Date: 2018-02-09 16:16:55

On Fri, 2018-02-09 at 14:24 +0100, Arnd Bergmann wrote:

quoted hunk

gcc-8 points out that source and destination of the memcpy() are
always the same pointer, so the effect of memcpy() is undefined
here (its arguments must not overlap):

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c: In function '_rtl_rx_process':
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c:430:2: error: 'memcpy' source argument is the same as destination [-Werror=restrict]

Most likely this is harmless, but it's easy to just remove the
line and get rid of the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
index ac4a82de40c7..9ab56827124e 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c

@@ -427,7 +427,6 @@ static void _rtl_rx_process(struct ieee80211_hw *hw, struct sk_buff *skb)
 		 (u32)hdr->addr1[0], (u32)hdr->addr1[1],
 		 (u32)hdr->addr1[2], (u32)hdr->addr1[3],
 		 (u32)hdr->addr1[4], (u32)hdr->addr1[5]);
-	memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
 	ieee80211_rx(hw, skb);
 }

trivia:

The RT_TRACE above this should probably use %pM too.
Not submitted as it would just cause a conflict.

---

 drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
index ac4a82de40c7..61da667ed8ba 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c

@@ -422,11 +422,8 @@ static void _rtl_rx_process(struct ieee80211_hw *hw, struct sk_buff *skb)
 	if (ieee80211_is_data(fc))
 		RT_TRACE(rtlpriv, COMP_INIT, DBG_DMESG, "Got data frame\n");
 	RT_TRACE(rtlpriv, COMP_INIT, DBG_DMESG,
-		 "Fram: fc = 0x%X addr1 = 0x%02X:0x%02X:0x%02X:0x%02X:0x%02X:0x%02X\n",
-		 fc,
-		 (u32)hdr->addr1[0], (u32)hdr->addr1[1],
-		 (u32)hdr->addr1[2], (u32)hdr->addr1[3],
-		 (u32)hdr->addr1[4], (u32)hdr->addr1[5]);
+		 "Fram: fc = 0x%X addr1 = %pM\n",
+		 fc, hdr->addr1);
 	memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
 	ieee80211_rx(hw, skb);
 }

Re: [PATCH] rtlwifi: rtl8192cu: remove pointless memcpy

From: Larry Finger <hidden>
Date: 2018-02-09 16:44:23

On 02/09/2018 07:24 AM, Arnd Bergmann wrote:

quoted hunk

gcc-8 points out that source and destination of the memcpy() are
always the same pointer, so the effect of memcpy() is undefined
here (its arguments must not overlap):

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c: In function '_rtl_rx_process':
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c:430:2: error: 'memcpy' source argument is the same as destination [-Werror=restrict]

Most likely this is harmless, but it's easy to just remove the
line and get rid of the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
  drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c | 1 -
  1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
index ac4a82de40c7..9ab56827124e 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c

@@ -427,7 +427,6 @@ static void _rtl_rx_process(struct ieee80211_hw *hw, struct sk_buff *skb)
  		 (u32)hdr->addr1[0], (u32)hdr->addr1[1],
  		 (u32)hdr->addr1[2], (u32)hdr->addr1[3],
  		 (u32)hdr->addr1[4], (u32)hdr->addr1[5]);
-	memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
  	ieee80211_rx(hw, skb);
  }

No, the warning is pointing to the wrong place. The routine in question does the 
following:

1. Loads the rx_status struct from skb->cb.
2. Overwrites the contents with 0.
3. Fills various members of the struct.
4. Writes the revised struct back into skb->cb.

Thus eliminating step 4 negates all the things done in step 3, and is wrong. The 
correct fix is to change step 1 to create a NULL-filled rx_status struct, and 
eliminate step 2.

NACK.

Larry

Re: [PATCH] rtlwifi: rtl8192cu: remove pointless memcpy

From: Larry Finger <hidden>
Date: 2018-02-09 16:57:01

On 02/09/2018 07:24 AM, Arnd Bergmann wrote:

quoted hunk

gcc-8 points out that source and destination of the memcpy() are
always the same pointer, so the effect of memcpy() is undefined
here (its arguments must not overlap):

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c: In function '_rtl_rx_process':
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c:430:2: error: 'memcpy' source argument is the same as destination [-Werror=restrict]

Most likely this is harmless, but it's easy to just remove the
line and get rid of the warning.

Signed-off-by: Arnd Bergmann <redacted>
---
  drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c | 1 -
  1 file changed, 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
index ac4a82de40c7..9ab56827124e 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c

@@ -427,7 +427,6 @@ static void _rtl_rx_process(struct ieee80211_hw *hw, struct sk_buff *skb)
  		 (u32)hdr->addr1[0], (u32)hdr->addr1[1],
  		 (u32)hdr->addr1[2], (u32)hdr->addr1[3],
  		 (u32)hdr->addr1[4], (u32)hdr->addr1[5]);
-	memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
  	ieee80211_rx(hw, skb);
  }

Argh. Once again I got tripped up on pointers. Yes, this patch is correct.

Acked-by: Larry Finger <redacted>

Sorry about the noise.

Larry

Re: rtlwifi: rtl8192cu: remove pointless memcpy

From: Kalle Valo <hidden>
Date: 2018-02-27 16:18:21

Arnd Bergmann [off-list ref] wrote:

gcc-8 points out that source and destination of the memcpy() are
always the same pointer, so the effect of memcpy() is undefined
here (its arguments must not overlap):

drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c: In function '_rtl_rx_process':
drivers/net/wireless/realtek/rtlwifi/rtl8192cu/trx.c:430:2: error: 'memcpy' source argument is the same as destination [-Werror=restrict]

Most likely this is harmless, but it's easy to just remove the
line and get rid of the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Larry Finger <redacted>

Patch applied to wireless-drivers-next.git, thanks.

dcdd54c2bcae rtlwifi: rtl8192cu: remove pointless memcpy

-- 
https://patchwork.kernel.org/patch/10208979/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

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