[Intel-wired-lan] [PATCH iwl-next 2/5] ice: schedule service task in IRQ thread_fn

[Jacob Keller <jacob.e.keller@intel.com>]

From: Karol Kolacinski <karol.kolacinski@intel.com>

If the kernel is configured with CONFIG_PREEMPT_RT, scheduling the service
task in interrupt context can result in a kernel panic. This is a result of
ice_service_task_schedule calling queue_work.

Move the ice_service_task_schedule() call into the miscellaneous IRQ thread
that functions as the interrupt bottom half.

Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 9e4d7d884115..8b59632ec6b1 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3058,7 +3058,6 @@ static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
 {
 	struct ice_pf *pf = (struct ice_pf *)data;
 	struct ice_hw *hw = &pf->hw;
-	irqreturn_t ret = IRQ_NONE;
 	struct device *dev;
 	u32 oicr, ena_mask;
 
@@ -3139,10 +3138,8 @@ static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
 
 	if (oicr & PFINT_OICR_TSYN_TX_M) {
 		ena_mask &= ~PFINT_OICR_TSYN_TX_M;
-		if (!hw->reset_ongoing) {
+		if (!hw->reset_ongoing)
 			pf->oicr_misc |= PFINT_OICR_TSYN_TX_M;
-			ret = IRQ_WAKE_THREAD;
-		}
 	}
 
 	if (oicr & PFINT_OICR_TSYN_EVNT_M) {
@@ -3159,7 +3156,6 @@ static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
 					       GLTSYN_STAT_EVENT2_M);
 
 			pf->oicr_misc |= PFINT_OICR_TSYN_EVNT_M;
-			ret = IRQ_WAKE_THREAD;
 		}
 	}
 
@@ -3180,16 +3176,12 @@ static irqreturn_t ice_misc_intr(int __always_unused irq, void *data)
 		if (oicr & (PFINT_OICR_PCI_EXCEPTION_M |
 			    PFINT_OICR_ECC_ERR_M)) {
 			set_bit(ICE_PFR_REQ, pf->state);
-			ice_service_task_schedule(pf);
 		}
 	}
-	if (!ret)
-		ret = IRQ_HANDLED;
 
-	ice_service_task_schedule(pf);
 	ice_irq_dynamic_ena(hw, NULL, NULL);
 
-	return ret;
+	return IRQ_WAKE_THREAD;
 }
 
 /**
@@ -3204,6 +3196,8 @@ static irqreturn_t ice_misc_intr_thread_fn(int __always_unused irq, void *data)
 	if (ice_is_reset_in_progress(pf->state))
 		return IRQ_HANDLED;
 
+	ice_service_task_schedule(pf);
+
 	if (pf->oicr_misc & PFINT_OICR_TSYN_EVNT_M) {
 		ice_ptp_extts_event(pf);
 		pf->oicr_misc &= ~PFINT_OICR_TSYN_EVNT_M;
-- 
2.40.0.471.gbd7f14d9353b

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