Patch "ath10k: fix invalid NSS for 4x4 devices" has been added to the 4.3-stable tree

Patch "ath10k: fix invalid NSS for 4x4 devices" has been added to the 4.3-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ath10k: fix invalid NSS for 4x4 devices

to the 4.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ath10k-fix-invalid-nss-for-4x4-devices.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From f680f70adbeab28b35f849016b964dd645db6237 Mon Sep 17 00:00:00 2001
From: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Date: Tue, 3 Nov 2015 11:51:33 +0530
Subject: ath10k: fix invalid NSS for 4x4 devices

From: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>

commit f680f70adbeab28b35f849016b964dd645db6237 upstream.

The number of spatial streams that are derived from chain mask
for 4x4 devices is using wrong bitmask and conditional check.
This is affecting downlink throughput for QCA99x0 devices. Earlier
cfg_tx_chainmask is not filled by default until user configured it
and so get_nss_from_chainmask never be called. This issue is exposed
by recent commit 166de3f1895d ("ath10k: remove supported chain mask").
By default maximum supported chain mask is filled in cfg_tx_chainmask.

Fixes: 5572a95b4b ("ath10k: apply chainmask settings to vdev on creation")
Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/ath/ath10k/mac.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -4056,7 +4056,7 @@ static int ath10k_config(struct ieee8021
 
 static u32 get_nss_from_chainmask(u16 chain_mask)
 {
-	if ((chain_mask & 0x15) == 0x15)
+	if ((chain_mask & 0xf) == 0xf)
 		return 4;
 	else if ((chain_mask & 0x7) == 0x7)
 		return 3;


Patches currently in stable-queue which might be from rmanohar@qti.qualcomm.com are

queue-4.3/ath10k-fix-invalid-nss-for-4x4-devices.patch