b43: Fix possible unaligned u32 access

Fix possible unaligned u32 access in b43_generate_plcp_hdr().
Unaligned data is read/write with a u32 pointer instead of using the
packed structure. Some versions of gcc ignore the "packed" attribute, if the
structure element is accessed through a local pointer.

Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/net/wireless/b43/xmit.c b/drivers/net/wireless/b43/xmit.c
index a63d88841df..55f36a7254d 100644
--- a/drivers/net/wireless/b43/xmit.c
+++ b/drivers/net/wireless/b43/xmit.c
@@ -118,7 +118,6 @@ u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
 void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
                            const u16 octets, const u8 bitrate)
 {
-        __le32 *data = &(plcp->data);
         __u8 *raw = plcp->raw;
 
         if (b43_is_ofdm_rate(bitrate)) {
@@ -127,7 +126,7 @@ void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
                 d = b43_plcp_get_ratecode_ofdm(bitrate);
                 B43_WARN_ON(octets & 0xF000);
                 d |= (octets << 5);
-                *data = cpu_to_le32(d);
+                plcp->data = cpu_to_le32(d);
         } else {
                 u32 plen;
 
@@ -141,7 +140,7 @@ void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
                                 raw[1] = 0x04;
                 } else
                         raw[1] = 0x04;
-                *data |= cpu_to_le32(plen << 16);
+                plcp->data |= cpu_to_le32(plen << 16);
                 raw[0] = b43_plcp_get_ratecode_cck(bitrate);
         }
 }