linux-kernel - [PATCH 4.9 084/171] staging: wilc1000: Fix problem with wrong vif index

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Message-Id: <20181108215133.574744598@linuxfoundation.org>
Date:   Thu,  8 Nov 2018 13:50:54 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Aditya Shankar <aditya.shankar@...rochip.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 084/171] staging: wilc1000: Fix problem with wrong vif index

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 0e490657c7214cce33fbca3d88227298c5c968ae ]

The vif->idx value is always 0 for two interfaces.

wl->vif_num = 0;

loop {
     ...

     vif->idx = wl->vif_num;
     ...
     wl->vif_num = i;
      ....
     i++;
     ...
}

At present, vif->idx is assigned the value of wl->vif_num
at the beginning of this block and device is initialized
based on this index value.
In the next iteration, wl->vif_num is still 0 as it is only updated
later but gets assigned to vif->idx in the beginning. This causes problems
later when we try to reference a particular interface and also while
configuring the firmware.

This patch moves the assignment to vif->idx from the beginning
of the block to after wl->vif_num is updated with latest value of i.

Fixes: commit 735bb39ca3be ("staging: wilc1000: simplify vif[i]->ndev accesses")
Cc: <stable@...r.kernel.org>
Signed-off-by: Aditya Shankar <aditya.shankar@...rochip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/wilc1000/linux_wlan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/wilc1000/linux_wlan.c b/drivers/staging/wilc1000/linux_wlan.c
index 07d6e4824a9d..2e5e3b368532 100644
--- a/drivers/staging/wilc1000/linux_wlan.c
+++ b/drivers/staging/wilc1000/linux_wlan.c
@@ -1260,11 +1260,12 @@ int wilc_netdev_init(struct wilc **wilc, struct device *dev, int io_type,
 		else
 			strcpy(ndev->name, "p2p%d");
 
-		vif->idx = wl->vif_num;
 		vif->wilc = *wilc;
 		vif->ndev = ndev;
 		wl->vif[i] = vif;
 		wl->vif_num = i;
+		vif->idx = wl->vif_num;
+
 		ndev->netdev_ops = &wilc_netdev_ops;
 
 		{
-- 
2.17.1