From: Zhu Yanjun <yanjun....@oracle.com> Date: Sat, 11 Nov 2017 10:42:03 -0500
> When "NETDEV WATCHDOG: em4 (bnx2x): transmit queue 2 timed out" occurs, > BNX2X_SP_RTNL_TX_TIMEOUT is set. In the function bnx2x_sp_rtnl_task, > bnx2x_nic_unload and bnx2x_nic_load are executed to shutdown and open > NIC. In the function bnx2x_nic_load, bnx2x_alloc_mem allocates dma > failure. The message "bnx2x: [bnx2x_alloc_mem:8399(em4)]Can't > allocate memory" pops out. The variable slowpath is set to NULL. > When shutdown the NIC, the function bnx2x_nic_unload is called. In > the function bnx2x_nic_unload, the following functions are executed. > bnx2x_chip_cleanup > bnx2x_set_storm_rx_mode > bnx2x_set_q_rx_mode > bnx2x_set_q_rx_mode > bnx2x_config_rx_mode > bnx2x_set_rx_mode_e2 > In the function bnx2x_set_rx_mode_e2, the variable slowpath is operated. > Then the crash occurs. > To fix this crash, the variable slowpath is checked. And in the function > bnx2x_sp_rtnl_task, after dma memory allocation fails, another shutdown > and open NIC is executed. > > CC: Joe Jin <joe....@oracle.com> > CC: Junxiao Bi <junxiao...@oracle.com> > Signed-off-by: Zhu Yanjun <yanjun....@oracle.com> > Acked-by: Ariel Elior <ael...@cavium.com> Applied.
