From 95844124385eae4bd9ca5f9514a0fc33d561ac3c Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Mon, 19 Aug 2019 13:20:07 +0200 Subject: [PATCH] rt2x00: clear IV's on start to fix AP mode regression To do not brake HW restart we should keep initialization vectors data. I assumed that on start the data is already initialized to zeros, but that not true on some scenarios and we should clear it. So add additional flag to check if we are under HW restart and clear IV's data if we are not. Patch fixes AP mode regression. Reported-and-tested-by: Emil Karlson Fixes: 710e6cc1595e ("rt2800: do not nullify initialization vector data") Signed-off-by: Stanislaw Gruszka Signed-off-by: Kalle Valo --- drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 9 +++++++++ drivers/net/wireless/ralink/rt2x00/rt2x00.h | 1 + drivers/net/wireless/ralink/rt2x00/rt2x00dev.c | 13 ++++++++----- 3 files changed, 18 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c index c9b957ac5733..ecbe78b8027b 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c @@ -6094,6 +6094,15 @@ static int rt2800_init_registers(struct rt2x00_dev *rt2x00dev) rt2800_delete_wcid_attr(rt2x00dev, i); } + /* + * Clear encryption initialization vectors on start, but keep them + * for watchdog reset. Otherwise we will have wrong IVs and not be + * able to keep connections after reset. + */ + if (!test_bit(DEVICE_STATE_RESET, &rt2x00dev->flags)) + for (i = 0; i < 256; i++) + rt2800_register_write(rt2x00dev, MAC_IVEIV_ENTRY(i), 0); + /* * Clear all beacons */ diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00.h b/drivers/net/wireless/ralink/rt2x00/rt2x00.h index 7e43690a861c..2b216edd0c7d 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h @@ -658,6 +658,7 @@ enum rt2x00_state_flags { DEVICE_STATE_ENABLED_RADIO, DEVICE_STATE_SCANNING, DEVICE_STATE_FLUSHING, + DEVICE_STATE_RESET, /* * Driver configuration diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c index 35414f97a978..9d158237ac67 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c @@ -1256,13 +1256,14 @@ static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev) int rt2x00lib_start(struct rt2x00_dev *rt2x00dev) { - int retval; + int retval = 0; if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags)) { /* * This is special case for ieee80211_restart_hw(), otherwise * mac80211 never call start() two times in row without stop(); */ + set_bit(DEVICE_STATE_RESET, &rt2x00dev->flags); rt2x00dev->ops->lib->pre_reset_hw(rt2x00dev); rt2x00lib_stop(rt2x00dev); } @@ -1273,14 +1274,14 @@ int rt2x00lib_start(struct rt2x00_dev *rt2x00dev) */ retval = rt2x00lib_load_firmware(rt2x00dev); if (retval) - return retval; + goto out; /* * Initialize the device. */ retval = rt2x00lib_initialize(rt2x00dev); if (retval) - return retval; + goto out; rt2x00dev->intf_ap_count = 0; rt2x00dev->intf_sta_count = 0; @@ -1289,11 +1290,13 @@ int rt2x00lib_start(struct rt2x00_dev *rt2x00dev) /* Enable the radio */ retval = rt2x00lib_enable_radio(rt2x00dev); if (retval) - return retval; + goto out; set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags); - return 0; +out: + clear_bit(DEVICE_STATE_RESET, &rt2x00dev->flags); + return retval; } void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev) -- GitLab