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Staging: rtl8188eu: Use put_unaligned_le16

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Using byte ordering functions and then memcpy() is risky and
prone to hide errors which are hard to track down. So, this
patch introduces the use of function put_unaligned_le16 which
makes the code clear. Here, use of variable tim_bitmap_le
and variable itself is removed. Also, to be compatible with the
changes header file is added too.

Coccinelle is used to do this change and semantic patch used for
this is as follows:

@a@
typedef __le16;
__le16 e16;
identifier tmp;
expression ptr;
expression y,e;
type T;
@@

- tmp = cpu_to_le16(y);

<+... when != tmp
(
- memcpy(ptr, (T)&tmp, \(2\|sizeof(__le16)\|sizeof(e16)\));
+ put_unaligned_le16(y,ptr);
|
- memcpy(ptr, (T)&tmp, ...);
+ put_unaligned_le16(y,ptr);
)
...+>
? tmp = e

@@ type T; identifier a.tmp; @@

- T tmp;
...when != tmp

Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vaishali Thakkar 2015-02-20 14:18:37 +05:30 committed by Greg Kroah-Hartman
parent 78f5d8f9f9
commit e4504a1519
1 changed files with 3 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/staging/rtl8188eu/core/rtw_ap.c
View File

@ -23,6 +23,7 @@
#include <drv_types.h>
#include <wifi.h>
#include <ieee80211.h>
#include <asm/unaligned.h>
#ifdef CONFIG_88EU_AP_MODE
@ -78,11 +79,8 @@ static void update_BCNTIM(struct adapter *padapter)
if (true) {
u8 *p, *dst_ie, *premainder_ie = NULL;
u8 *pbackup_remainder_ie = NULL;
__le16 tim_bitmap_le;
uint offset, tmp_len, tim_ielen, tim_ie_offset, remainder_ielen;
tim_bitmap_le = cpu_to_le16(pstapriv->tim_bitmap);
p = rtw_get_ie(pie + _FIXED_IE_LENGTH_, _TIM_IE_, &tim_ielen, pnetwork_mlmeext->IELength - _FIXED_IE_LENGTH_);
if (p != NULL && tim_ielen > 0) {
tim_ielen += 2;
@ -137,9 +135,9 @@ static void update_BCNTIM(struct adapter *padapter)
*dst_ie++ = 0;
if (tim_ielen == 4) {
*dst_ie++ = *(u8 *)&tim_bitmap_le;
*dst_ie++ = pstapriv->tim_bitmap & 0xff;
} else if (tim_ielen == 5) {
memcpy(dst_ie, &tim_bitmap_le, 2);
put_unaligned_le16(pstapriv->tim_bitmap, dst_ie);
dst_ie += 2;
}