mwifiex: clean pcie ring only when device is present

commit 4f7ba432202c8330cc03ab959c6228d0de5dc4a3 upstream.

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

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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index 95fa3599b4070b02aecc8d4d46073137b05c5b98..35f881585962ff0c5dd2ea383ab6718ca170990d 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);
 }