From: Mitch Williams Date: Thu, 6 Mar 2014 08:59:56 +0000 (+0000) Subject: i40evf: fix oops in watchdog handler X-Git-Tag: firefly_0821_release~176^2~4167^2~51^2~12 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3526d8005f23da22846bdbdb4ed445ab0038dff0;p=firefly-linux-kernel-4.4.55.git i40evf: fix oops in watchdog handler The Tx watchdog handler runs in interrupt context, so it would cause an oops when sending an admin queue message to request a reset, because the admin queue functions use spinlocks. Instead, set a flag and let the reset task handle sending the request. Change-ID: I65879470b72963d9c308edfb8f45ac4fbba2c14f Signed-off-by: Mitch Williams Signed-off-by: Catherine Sullivan Tested-by: Sibai Li Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/i40evf/i40evf.h b/drivers/net/ethernet/intel/i40evf/i40evf.h index ccb43d343543..807807d62387 100644 --- a/drivers/net/ethernet/intel/i40evf/i40evf.h +++ b/drivers/net/ethernet/intel/i40evf/i40evf.h @@ -211,6 +211,7 @@ struct i40evf_adapter { #define I40EVF_FLAG_NEED_LINK_UPDATE (u32)(1 << 7) #define I40EVF_FLAG_PF_COMMS_FAILED (u32)(1 << 8) #define I40EVF_FLAG_RESET_PENDING (u32)(1 << 9) +#define I40EVF_FLAG_RESET_NEEDED (u32)(1 << 10) /* duplcates for common code */ #define I40E_FLAG_FDIR_ATR_ENABLED 0 #define I40E_FLAG_DCB_ENABLED 0 diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c index d3eafa320ba9..51c84c19d2be 100644 --- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c +++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c @@ -169,9 +169,7 @@ static void i40evf_tx_timeout(struct net_device *netdev) adapter->tx_timeout_count++; dev_info(&adapter->pdev->dev, "TX timeout detected.\n"); if (!(adapter->flags & I40EVF_FLAG_RESET_PENDING)) { - dev_info(&adapter->pdev->dev, "Requesting reset from PF\n"); - i40evf_request_reset(adapter); - adapter->flags |= I40EVF_FLAG_RESET_PENDING; + adapter->flags |= I40EVF_FLAG_RESET_NEEDED; schedule_work(&adapter->reset_task); } } @@ -1484,6 +1482,12 @@ static void i40evf_reset_task(struct work_struct *work) while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section)) udelay(500); + + if (adapter->flags & I40EVF_FLAG_RESET_NEEDED) { + dev_info(&adapter->pdev->dev, "Requesting reset from PF\n"); + i40evf_request_reset(adapter); + } + /* poll until we see the reset actually happen */ for (i = 0; i < I40EVF_RESET_WAIT_COUNT; i++) { rstat_val = rd32(hw, I40E_VFGEN_RSTAT) &