From: Heiner Kallweit hkallweit1@gmail.com
[ Upstream commit 424a646e072a887aa87283b53aa6f8b19c2a7bef ]
For several network drivers it was reported that using __napi_schedule_irqoff() is unsafe with forced threading. One way to fix this is switching back to __napi_schedule, but then we lose the benefit of the irqoff version in general. As stated by Eric it doesn't make sense to make the minimal hard irq handlers in drivers using NAPI a thread. Therefore ensure that the hard irq handler is never thread-ified.
Fixes: 9a899a35b0d6 ("r8169: switch to napi_schedule_irqoff") Link: https://lkml.org/lkml/2020/10/18/19 Signed-off-by: Heiner Kallweit hkallweit1@gmail.com Link: https://lore.kernel.org/r/4d3ef84a-c812-5072-918a-22a6f6468310@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/realtek/r8169_main.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -6418,7 +6418,7 @@ static int rtl8169_close(struct net_devi
phy_disconnect(tp->phydev);
- pci_free_irq(pdev, 0, tp); + free_irq(pci_irq_vector(pdev, 0), tp);
dma_free_coherent(&pdev->dev, R8169_RX_RING_BYTES, tp->RxDescArray, tp->RxPhyAddr); @@ -6469,8 +6469,8 @@ static int rtl_open(struct net_device *d
rtl_request_firmware(tp);
- retval = pci_request_irq(pdev, 0, rtl8169_interrupt, NULL, tp, - dev->name); + retval = request_irq(pci_irq_vector(pdev, 0), rtl8169_interrupt, + IRQF_NO_THREAD | IRQF_SHARED, dev->name, tp); if (retval < 0) goto err_release_fw_2;
@@ -6503,7 +6503,7 @@ out: return retval;
err_free_irq: - pci_free_irq(pdev, 0, tp); + free_irq(pci_irq_vector(pdev, 0), tp); err_release_fw_2: rtl_release_firmware(tp); rtl8169_rx_clear(tp);