linux-kernel - Fixing rt2500pci

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Date:	Wed, 30 Jul 2008 15:08:03 +1000
From:	Peter Chubb <peterc@...ato.unsw.edu.au>
To:	Ivo van Doorn <ivdoorn@...il.com>
cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Fixing rt2500pci


In kernel version 2.6.26-rc9 my wireless LAN card worked; but in the
released 2.6.26, my RaLink rt2500 card wouldn't associate.

Git-bisect led me to this patch:

	61486e0f68d1f8966c09b734566a187d42d65c54
	rt2x00: Remove ieee80211_tx_control argument from write_tx_desc()

I believe that there are two problems with that patch.  Setting the Tx
Length has been removed inadvertently, and one of the conditions for
when to set ifs to IFS_SIFS has also been removed.

This patch fixes those things, and with it my card works again.

Signed-off-by: Peter Chubb <peterc@...ato.unsw.edu.au>

diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index 1724ce9..4ba2165 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -1198,6 +1198,7 @@ static void rt2500pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 	rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
 	rt2x00_set_field32(&word, TXD_W0_RETRY_MODE,
 			   test_bit(ENTRY_TXD_RETRY_MODE, &txdesc->flags));
+	rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, skbdesc->data_len);
 	rt2x00_set_field32(&word, TXD_W0_CIPHER_ALG, CIPHER_NONE);
 	rt2x00_desc_write(txd, 0, word);
 }
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index e1368f7..a11d6ff 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -691,7 +691,8 @@ void rt2x00lib_write_tx_desc(struct rt2x00_dev *rt2x00dev,
 	 * Set ifs to IFS_SIFS when the this is not the first fragment,
 	 * or this fragment came after RTS/CTS.
 	 */
-	if (test_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags)) {
+	if ((seq_ctrl & IEEE80211_SCTL_FRAG)  ||
+		test_bit(ENTRY_TXD_RTS_FRAME, &txdesc.flags)) {
 		txdesc.ifs = IFS_SIFS;
 	} else if (control->flags & IEEE80211_TXCTL_FIRST_FRAGMENT) {
 		__set_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc.flags);

--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia
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