mwifiex: clean pcie ring only when device is present

Write io memory to clean PCIe buffer only when PCIe device is
present else this results into crash because of invalid memory
access.

Cc: <stable@vger.kernel.org> # 3.9+
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index 13eaeed03898288d43abf107090346d513132820..981cf6e7c73be5b65f4a90bb05ef0e9023c592f4 100644 (file)
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -559,7 +559,8 @@ mwifiex_clean_txrx(struct mwifiex_private *priv)
        mwifiex_wmm_delete_all_ralist(priv);
        memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 
-       if (priv->adapter->if_ops.clean_pcie_ring)
+       if (priv->adapter->if_ops.clean_pcie_ring &&
+           !priv->adapter->surprise_removed)
                priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
        spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 }