From: Avinash Patil <patila@marvell.com>
Date: Thu, 21 Feb 2013 05:12:58 +0000 (-0800)
Subject: mwifiex: fix system freeze while reloading driver
X-Git-Tag: v3.9-rc1~70^2~9^2^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=48f4d91679c0e0b26747f8adbb18e5212eb6d621;p=pandora-kernel.git

mwifiex: fix system freeze while reloading driver

Unload sequence for mwifiex PCIE driver is as follows:
1. Invoking cleanup module from kernel results into
   pci_unregister_driver
2. Kernel invokes PCIE remove() handler which disconnects all
   interfaces.
3. One step during disconnect is to clean PCIE TX rings.
   During this we read txbd_rdptr from FW.

While loading driver next time, we see pci_enable_device()
results into system freeze. This may have happened because we
accessed PCI device after unregistering from bus driver.
Removing this ioread() operation resolves this bug.

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>
---

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