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[PATCH] zd1211rw: Optimized handling of zero length entries in length info 

There are a high number of split USB transactions, which contain
only one packet but have a length info field. This patch optimizes
this code by stopping parsing the length info structure if a zero
length field is encountered.

Signed-off-by: Ulrich Kunitz <kune@deine-taler.de>
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ulrich Kunitz 2006-11-22 00:06:19 +00:00 committed by Jeff Garzik
parent 741fec53f2
commit 850c211ce6
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/zd1211rw/zd_usb.c
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@ -593,6 +593,8 @@ static void handle_rx_packet(struct zd_usb *usb, const u8 *buffer,
unsigned int l, k, n; unsigned int l, k, n;
for (i = 0, l = 0;; i++) { for (i = 0, l = 0;; i++) {
k = le16_to_cpu(get_unaligned(&length_info->length[i])); k = le16_to_cpu(get_unaligned(&length_info->length[i]));
if (k == 0)
return;
n = l+k; n = l+k;
if (n > length) if (n > length)
return; return;