From cf6a64fd603ae0f7391f7589b0f3568d4e79605c Mon Sep 17 00:00:00 2001 From: Amitkumar Karwar Date: Wed, 5 Nov 2014 17:04:29 +0530 Subject: mwifiex: fix out of memory issue observed for USB chipsets On some platforms, system goes out of memory during heavy Rx traffic with our USB chipsets. In case of SDIO/PCIe, after receiving 50 packets in Rx queue we stop processing interrupts till packets pending fall below low threshold i.e 20. We don't have similar logic for USB, so if host platform is slow, we would hit a case where firmware keeps on pushing packets at high speed than driver/kernel can process. We will stop submitting URBs for Rx data when pending packet count reaches high threshold and restart them when enough packets are consumed to solve the problem. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=85071 Reported-by: Marek Belisko Tested-by: Marek Belisko Signed-off-by: Avinash Patil Signed-off-by: Cathy Luo Signed-off-by: Amitkumar Karwar Signed-off-by: John W. Linville --- drivers/net/wireless/mwifiex/main.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/net/wireless/mwifiex/main.c') diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c index cb23ca3653b5..2a5a59bec124 100644 --- a/drivers/net/wireless/mwifiex/main.c +++ b/drivers/net/wireless/mwifiex/main.c @@ -146,6 +146,8 @@ static int mwifiex_process_rx(struct mwifiex_adapter *adapter) atomic_dec(&adapter->rx_pending); if (adapter->delay_main_work && (atomic_read(&adapter->rx_pending) < LOW_RX_PENDING)) { + if (adapter->if_ops.submit_rem_rx_urbs) + adapter->if_ops.submit_rem_rx_urbs(adapter); adapter->delay_main_work = false; queue_work(adapter->workqueue, &adapter->main_work); } -- cgit v1.2.3