diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2007-12-17 23:00:31 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-12-19 16:43:48 -0800 |
| commit | 286e310f94b9459f3fa975333781c969b1041522 (patch) | |
| tree | f9d2eb2d52ad5fbd38b3790e2ce8fab21e9aae5e /drivers | |
| parent | b9fc7dc514566e9788c7f064bb08f8b6e2fe6f72 (diff) | |
[TG3]: Endianness bugfix.
tg3_nvram_write_block_unbuffered() is reading data from nvram into
allocated buffer before overwriting a part of it with user-supplied
data. Then it feeds the entire page back to nvram. It should be
storing the words it had read as little-endian, not as host-endian.
Note that tg3_set_eeprom() does exactly that for padding the same
data to full words before it gets passed down to tg3_nvram_write_block()
and then to tg3_nvram_write_block_unbuffered().
Moreover, when we get to sending the entire thing back to nvram, we
go through it word-by-word, doing essentially
writel(swab32(le32_to_cpu(word)), ...)
so if we want them to reach the card in host-independent endianness,
we'd better really have all that buffer filled with fixed-endian.
For user-supplied part we obviously do have that (it's an array of
octets memcpy'd in), ditto for padding of user-supplied part to word
boundaries (taken care of in tg3_set_eeprom()). The rest of the
buffer gets filled by tg3_nvram_write_block_unbuffered() and it would
damn better be consistent with that (and with tg3_get_eeprom(), while
we are at it - there we also convert the words read from nvram to
little-endian before returning the buffer to user).
The bug should get triggered on big-endian boxen when set_eeprom is done
for less than entire page. Then the words that should've been unaffected
at all will actually get byteswapped in place in nvram.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/tg3.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index a76bb3dd30f..22eb7c8c1a2 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -10251,8 +10251,7 @@ static int tg3_nvram_write_block_unbuffered(struct tg3 *tp, u32 offset, u32 len, phy_addr = offset & ~pagemask; for (j = 0; j < pagesize; j += 4) { - /* Almost certainly should be tg3_nvram_read_le */ - if ((ret = tg3_nvram_read(tp, phy_addr + j, + if ((ret = tg3_nvram_read_le(tp, phy_addr + j, (__le32 *) (tmp + j)))) break; } |