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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>
This commit is contained in:
Matthieu CASTET 2009-06-04 23:18:33 +02:00 committed by John W. Linville
parent 5ee58d7e6a
commit b52a033c2c
1 changed files with 2 additions and 3 deletions
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5
drivers/net/wireless/b43/xmit.c
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@ -118,7 +118,6 @@ u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp, void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
const u16 octets, const u8 bitrate) const u16 octets, const u8 bitrate)
{ {
__le32 *data = &(plcp->data);
__u8 *raw = plcp->raw; __u8 *raw = plcp->raw;
if (b43_is_ofdm_rate(bitrate)) { 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); d = b43_plcp_get_ratecode_ofdm(bitrate);
B43_WARN_ON(octets & 0xF000); B43_WARN_ON(octets & 0xF000);
d |= (octets << 5); d |= (octets << 5);
*data = cpu_to_le32(d); plcp->data = cpu_to_le32(d);
} else { } else {
u32 plen; u32 plen;
@ -141,7 +140,7 @@ void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
raw[1] = 0x04; raw[1] = 0x04;
} else } else
raw[1] = 0x04; raw[1] = 0x04;
*data |= cpu_to_le32(plen << 16); plcp->data |= cpu_to_le32(plen << 16);
raw[0] = b43_plcp_get_ratecode_cck(bitrate); raw[0] = b43_plcp_get_ratecode_cck(bitrate);
} }
} }