Commit 48f4d916 authored by Avinash Patil's avatar Avinash Patil Committed by John W. Linville

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: default avatarAvinash Patil <patila@marvell.com>
Signed-off-by: default avatarBing Zhao <bzhao@marvell.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 1499d9fa
...@@ -908,17 +908,8 @@ static int mwifiex_pcie_delete_sleep_cookie_buf(struct mwifiex_adapter *adapter) ...@@ -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) static int mwifiex_clean_pcie_ring_buf(struct mwifiex_adapter *adapter)
{ {
struct pcie_service_card *card = adapter->card; 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; card->txbd_flush = 1;
/* write pointer already set at last send /* write pointer already set at last send
* send dnld-rdy intr again, wait for completion. * send dnld-rdy intr again, wait for completion.
......
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