fix unaligned accesses in b43/xmit.c (#5169)

SVN-Revision: 16474

package/mac80211/patches/541-b43_unaligned_access.pach

@@ -0,0 +1,52 @@
+From: Matthieu CASTET <castet.matthieu@free.fr>
+
+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>
+
+---
+
+Please queue this bugfix.
+
+
+diff --git a/drivers/net/wireless/b43/xmit.c b/drivers/net/wireless/b43/xmit.c
+index a63d888..55f36a7 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);
+ 	}
+ }
+
+-- 
+Greetings, Michael.
+--
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