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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>
This commit is contained in:
Avinash Patil 2013-02-20 21:12:58 -08:00 committed by John W. Linville
parent 1499d9fa54
commit 48f4d91679
1 changed files with 1 additions and 10 deletions
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11
drivers/net/wireless/mwifiex/pcie.c
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@ -908,17 +908,8 @@ static int mwifiex_pcie_delete_sleep_cookie_buf(struct mwifiex_adapter *adapter)
static int mwifiex_clean_pcie_ring_buf(struct mwifiex_adapter *adapter)
{
struct pcie_service_card *card = adapter->card;
const struct mwifiex_pcie_card_reg *reg = card->pcie.reg;
u32 rdptr;
/* Read the TX ring read pointer set by firmware */
if (mwifiex_read_reg(adapter, reg->tx_rdptr, &rdptr)) {
dev_err(adapter->dev,
"Flush TXBD: failed to read reg->tx_rdptr\n");
return -1;
}
if (!mwifiex_pcie_txbd_empty(card, rdptr)) {
if (!mwifiex_pcie_txbd_empty(card, card->txbd_rdptr)) {
card->txbd_flush = 1;
/* write pointer already set at last send
* send dnld-rdy intr again, wait for completion.