From f172b56309fbc4835b3f258df6865309dc02e80c Mon Sep 17 00:00:00 2001 From: Dedy Lansky Date: Wed, 10 Sep 2014 16:34:38 +0300 Subject: [PATCH] wil6210: fix for memory corruption upon rmmod Driver disabled PCI master before making sure HW is idle. This caused memory corruption in case HW access system memory after PCI master got disabled. The fix is to change uninit sequence. Make sure FW/HW is idle before disabling PCI Signed-off-by: Dedy Lansky Signed-off-by: Vladimir Kondratiev Signed-off-by: John W. Linville --- drivers/net/wireless/ath/wil6210/main.c | 26 ++++++++++++++++++++- drivers/net/wireless/ath/wil6210/pcie_bus.c | 2 +- 2 files changed, 26 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/main.c b/drivers/net/wireless/ath/wil6210/main.c index 696be3e71a82..22e9b8aeb1cf 100644 --- a/drivers/net/wireless/ath/wil6210/main.c +++ b/drivers/net/wireless/ath/wil6210/main.c @@ -20,6 +20,10 @@ #include "wil6210.h" #include "txrx.h" +#include "wmi.h" + +#define WAIT_FOR_DISCONNECT_TIMEOUT_MS 2000 +#define WAIT_FOR_DISCONNECT_INTERVAL_MS 10 static bool no_fw_recovery; module_param(no_fw_recovery, bool, S_IRUGO | S_IWUSR); @@ -631,6 +635,9 @@ int wil_up(struct wil6210_priv *wil) static int __wil_down(struct wil6210_priv *wil) { + int iter = WAIT_FOR_DISCONNECT_TIMEOUT_MS / + WAIT_FOR_DISCONNECT_INTERVAL_MS; + WARN_ON(!mutex_is_locked(&wil->mutex)); if (wil->platform_ops.bus_request) @@ -648,7 +655,24 @@ static int __wil_down(struct wil6210_priv *wil) wil->scan_request = NULL; } - wil6210_disconnect(wil, NULL); + if (test_bit(wil_status_fwconnected, &wil->status) || + test_bit(wil_status_fwconnecting, &wil->status)) + wmi_send(wil, WMI_DISCONNECT_CMDID, NULL, 0); + + /* make sure wil is idle (not connected) */ + mutex_unlock(&wil->mutex); + while (iter--) { + int idle = !test_bit(wil_status_fwconnected, &wil->status) && + !test_bit(wil_status_fwconnecting, &wil->status); + if (idle) + break; + msleep(WAIT_FOR_DISCONNECT_INTERVAL_MS); + } + mutex_lock(&wil->mutex); + + if (!iter) + wil_err(wil, "timeout waiting for idle FW/HW\n"); + wil_rx_fini(wil); return 0; diff --git a/drivers/net/wireless/ath/wil6210/pcie_bus.c b/drivers/net/wireless/ath/wil6210/pcie_bus.c index d2a1ca289d90..264c0f06ea0f 100644 --- a/drivers/net/wireless/ath/wil6210/pcie_bus.c +++ b/drivers/net/wireless/ath/wil6210/pcie_bus.c @@ -233,8 +233,8 @@ static void wil_pcie_remove(struct pci_dev *pdev) wil_dbg_misc(wil, "%s()\n", __func__); wil6210_debugfs_remove(wil); - wil_if_pcie_disable(wil); wil_if_remove(wil); + wil_if_pcie_disable(wil); if (wil->platform_ops.uninit) wil->platform_ops.uninit(wil->platform_handle); wil_if_free(wil); -- 2.20.1