xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[PATCH] Better fixup for the orinoco driver

Browse Source 
The latest kernel added a pretty ugly fix for the orinoco etherleak bug
which contains bogus skb->len checks already done by the caller and causes
copies of all odd sized frames (which are quite common)

While the skb->len check should be ripped out the other fix is harder to do
properly so I'm proposing for this the -mm tree only until next 2.6.x so
that it gets tested.

Instead of copying buffers around blindly this code implements a padding
aware version of the hermes buffer writing function which does padding as
the buffer is loaded and thus more cleanly and without bogus 1.5K copies.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Alan Cox
2005-10-28 15:14:52 -07:00
committed by Jeff Garzik
parent 63f57fb69b
commit 2c36ed22c6
3 changed files with 49 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/net/wireless/hermes.c
View File

@@ -444,6 +444,43 @@ int hermes_bap_pwrite(hermes_t *hw, int bap, const void *buf, unsigned len,
return err;
}
/* Write a block of data to the chip's buffer with padding if
* neccessary, via the BAP. Synchronization/serialization is the
* caller's problem. len must be even.
*
* Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
*/
int hermes_bap_pwrite_pad(hermes_t *hw, int bap, const void *buf, unsigned data_len, unsigned len,
u16 id, u16 offset)
{
int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
int err = 0;
if (len < 0 || len % 2 || data_len > len)
return -EINVAL;
err = hermes_bap_seek(hw, bap, id, offset);
if (err)
goto out;
/* Transfer all the complete words of data */
hermes_write_words(hw, dreg, buf, data_len/2);
/* If there is an odd byte left over pad and transfer it */
if (data_len & 1) {
u8 end[2];
end[1] = 0;
end[0] = ((unsigned char *)buf)[data_len - 1];
hermes_write_words(hw, dreg, end, 1);
data_len ++;
}
/* Now send zeros for the padding */
if (data_len < len)
hermes_clear_words(hw, dreg, (len - data_len) / 2);
/* Complete */
out:
return err;
}
/* Read a Length-Type-Value record from the card.
*
* If length is NULL, we ignore the length read from the card, and
@@ -531,6 +568,7 @@ EXPORT_SYMBOL(hermes_allocate);
EXPORT_SYMBOL(hermes_bap_pread);
EXPORT_SYMBOL(hermes_bap_pwrite);
EXPORT_SYMBOL(hermes_bap_pwrite_pad);
EXPORT_SYMBOL(hermes_read_ltv);
EXPORT_SYMBOL(hermes_write_ltv);