Patch "tsnep: Fix NAPI scheduling" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    tsnep: Fix NAPI scheduling

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tsnep-fix-napi-scheduling.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e22bd8bcd41452700dc4aa91caf2ccbc7214bbf9
Author: Gerhard Engleder <gerhard@xxxxxxxxxxxxxxxxxxxxx>
Date:   Fri Sep 15 23:01:24 2023 +0200

    tsnep: Fix NAPI scheduling
    
    [ Upstream commit ea852c17f5382a0a52041cfbd9a4451ae0fa1a38 ]
    
    According to the NAPI documentation networking/napi.rst, drivers which
    have to mask interrupts explicitly should use the napi_schedule_prep()
    and __napi_schedule() calls.
    
    No problem seen so far with current implementation. Nevertheless, let's
    align the implementation with documentation.
    
    Signed-off-by: Gerhard Engleder <gerhard@xxxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index 6bf3cc11d2121..00436a6f785e8 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -65,8 +65,11 @@ static irqreturn_t tsnep_irq(int irq, void *arg)
 
 	/* handle TX/RX queue 0 interrupt */
 	if ((active & adapter->queue[0].irq_mask) != 0) {
-		tsnep_disable_irq(adapter, adapter->queue[0].irq_mask);
-		napi_schedule(&adapter->queue[0].napi);
+		if (napi_schedule_prep(&adapter->queue[0].napi)) {
+			tsnep_disable_irq(adapter, adapter->queue[0].irq_mask);
+			/* schedule after masking to avoid races */
+			__napi_schedule(&adapter->queue[0].napi);
+		}
 	}
 
 	return IRQ_HANDLED;
@@ -77,8 +80,11 @@ static irqreturn_t tsnep_irq_txrx(int irq, void *arg)
 	struct tsnep_queue *queue = arg;
 
 	/* handle TX/RX queue interrupt */
-	tsnep_disable_irq(queue->adapter, queue->irq_mask);
-	napi_schedule(&queue->napi);
+	if (napi_schedule_prep(&queue->napi)) {
+		tsnep_disable_irq(queue->adapter, queue->irq_mask);
+		/* schedule after masking to avoid races */
+		__napi_schedule(&queue->napi);
+	}
 
 	return IRQ_HANDLED;
 }