Il 10/02/22 02:21, qizhong cheng ha scritto:

We found a failure when used iperf tool for wifi performance testing, there are some MSIs received while clearing the interrupt status, these MSIs cannot be serviced.

The interrupt status can be cleared even the MSI status still remaining, as an edge-triggered interrupts, its interrupt status should be cleared before dispatching to the handler of device.

Signed-off-by: qizhong cheng qizhong.cheng@mediatek.com

Hello Qizhong,

This commit is fixing an issue, which means that you *have to* add a proper Fixes tag.

I believe that this is fixing commit 43e6409db64d ("PCI: mediatek: Add MSI support for MT2712 and MT7622").

Please add the tag and send a v3, after which: Reviewed-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com

---

v2:

• Update the subject line.
• Improve the commit log and code comments.

drivers/pci/controller/pcie-mediatek.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index 2f3f974977a3..2856d74b2513 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -624,12 +624,17 @@ static void mtk_pcie_intr_handler(struct irq_desc *desc) if (status & MSI_STATUS){ unsigned long imsi_status;

• 	/*
  

• 	 * The interrupt status can be cleared even the MSI
  

• 	 * status still remaining, hence as an edge-triggered
  

• 	 * interrupts, its interrupt status should be cleared
  

• 	 * before dispatching handler.
  

• 	 */
  

• 	writel(MSI_STATUS, port->base + PCIE_INT_STATUS);
  while ((imsi_status = readl(port->base + PCIE_IMSI_STATUS))) {
  	for_each_set_bit(bit, &imsi_status, MTK_MSI_IRQS_NUM)
  		generic_handle_domain_irq(port->inner_domain, bit);
  }
  

• 	/* Clear MSI interrupt status */
  

• 	writel(MSI_STATUS, port->base + PCIE_INT_STATUS);
  

  } }