mwifiex: fix soft lockup during iperf UDP RX

A soft lockup was observed on ARM multicore platform while UDP
RX iperf was running on station.

Reason for this is delay_main_task was not taken into consideration while
jumping to process_start. Now if delay_main_task is true, we would exit
mwifiex_main_process instead of going to process_start again.
This ensure other process is scheduled on this CPU and soft lockup is avoided.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kevin Gan <ganhy@marvell.com>
Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c
index b522f7c3690118720ba01b7206a487fbdfab9ebe..be5218987101c3beac428ddd131be7191147c6a6 100644 (file)
--- a/drivers/net/wireless/mwifiex/main.c
+++ b/drivers/net/wireless/mwifiex/main.c
@@ -330,7 +330,8 @@ process_start:
        } while (true);
 
        spin_lock_irqsave(&adapter->main_proc_lock, flags);
-       if ((adapter->int_status) || IS_CARD_RX_RCVD(adapter)) {
+       if (!adapter->delay_main_work &&
+           (adapter->int_status || IS_CARD_RX_RCVD(adapter))) {
                spin_unlock_irqrestore(&adapter->main_proc_lock, flags);
                goto process_start;
        }