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r8169: fix issue with forced threading in combination with shared interrupts 

[ Upstream commit 2734a24e6e ]

As reported by Serge flag IRQF_NO_THREAD causes an error if the
interrupt is actually shared and the other driver(s) don't have this
flag set. This situation can occur if a PCI(e) legacy interrupt is
used in combination with forced threading.
There's no good way to deal with this properly, therefore we have to
remove flag IRQF_NO_THREAD. For fixing the original forced threading
issue switch to napi_schedule().

Fixes: 424a646e07 ("r8169: fix operation under forced interrupt threading")
Link: https://www.spinics.net/lists/netdev/msg694960.html
Reported-by: Serge Belyshev <belyshev@depni.sinp.msu.ru>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Serge Belyshev <belyshev@depni.sinp.msu.ru>
Link: https://lore.kernel.org/r/b5b53bfe-35ac-3768-85bf-74d1290cf394@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Heiner Kallweit 2020-10-29 10:18:53 +01:00 committed by Greg Kroah-Hartman
parent f1493ab336
commit 4939183bb2
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/realtek/r8169_main.c
View File

@ -6264,7 +6264,7 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
}
rtl_irq_disable(tp);
napi_schedule_irqoff(&tp->napi);
napi_schedule(&tp->napi);
out:
rtl_ack_events(tp, status);
@ -6470,7 +6470,7 @@ static int rtl_open(struct net_device *dev)
rtl_request_firmware(tp);
retval = request_irq(pci_irq_vector(pdev, 0), rtl8169_interrupt,
IRQF_NO_THREAD | IRQF_SHARED, dev->name, tp);
IRQF_SHARED, dev->name, tp);
if (retval < 0)
goto err_release_fw_2;