From b4764c809a306ea37b6409494896e919bbb5ec5f Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Sat, 6 Oct 2012 20:42:54 +0200 Subject: [PATCH] carl9170: handle traps from firmware loader This patch changes the way the driver deals with command responses and traps which are sent through the special interrupt input endpoint 3. While the carl9170 firmware does not use this endpoint for command responses or traps, the firmware loader on the device does. It uses it to notify the host about 'watchdog triggered' in case the firmware/hardware has crashed. Note: Even without this patch, the driver is still able to detect the mishap and reset the device. But previously it did that because the trap event caused an out-of-order message sequence number error, which also triggered a reset. Signed-off-by: Christian Lamparter Signed-off-by: John W. Linville --- drivers/net/wireless/ath/carl9170/rx.c | 6 +++--- drivers/net/wireless/ath/carl9170/usb.c | 7 +++++++ 2 files changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/carl9170/rx.c b/drivers/net/wireless/ath/carl9170/rx.c index a0b723078547..9cd93f1d8bef 100644 --- a/drivers/net/wireless/ath/carl9170/rx.c +++ b/drivers/net/wireless/ath/carl9170/rx.c @@ -164,9 +164,6 @@ void carl9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len) struct carl9170_rsp *cmd = buf; struct ieee80211_vif *vif; - if (carl9170_check_sequence(ar, cmd->hdr.seq)) - return; - if ((cmd->hdr.cmd & CARL9170_RSP_FLAG) != CARL9170_RSP_FLAG) { if (!(cmd->hdr.cmd & CARL9170_CMD_ASYNC_FLAG)) carl9170_cmd_callback(ar, len, buf); @@ -820,6 +817,9 @@ static void carl9170_rx_untie_cmds(struct ar9170 *ar, const u8 *respbuf, if (unlikely(i > resplen)) break; + if (carl9170_check_sequence(ar, cmd->hdr.seq)) + break; + carl9170_handle_command_response(ar, cmd, cmd->hdr.len + 4); } diff --git a/drivers/net/wireless/ath/carl9170/usb.c b/drivers/net/wireless/ath/carl9170/usb.c index 888152ce3eca..307bc0ddff99 100644 --- a/drivers/net/wireless/ath/carl9170/usb.c +++ b/drivers/net/wireless/ath/carl9170/usb.c @@ -295,6 +295,13 @@ static void carl9170_usb_rx_irq_complete(struct urb *urb) goto resubmit; } + /* + * While the carl9170 firmware does not use this EP, the + * firmware loader in the EEPROM unfortunately does. + * Therefore we need to be ready to handle out-of-band + * responses and traps in case the firmware crashed and + * the loader took over again. + */ carl9170_handle_command_response(ar, urb->transfer_buffer, urb->actual_length);