diff options
| author | Sven Eckelmann <sven@narfation.org> | 2024-09-05 22:49:38 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-09-10 03:17:39 +0300 |
| commit | 8410adf2e38ad32f20edf6d90e049a8203f51d9e (patch) | |
| tree | ddf385c49b007f165af902ce6353acca0a7c8edf /drivers/net | |
| parent | 40f111cc6e1b35562e815170d8f7efb49bf0fb21 (diff) | |
| download | linux-8410adf2e38ad32f20edf6d90e049a8203f51d9e.tar.xz | |
net: ag71xx: disable napi interrupts during probe
ag71xx_probe is registering ag71xx_interrupt as handler for gmac0/gmac1
interrupts. The handler is trying to use napi_schedule to handle the
processing of packets. But the netif_napi_add for this device is
called a lot later in ag71xx_probe.
It can therefore happen that a still running gmac0/gmac1 is triggering the
interrupt handler with a bit from AG71XX_INT_POLL set in
AG71XX_REG_INT_STATUS. The handler will then call napi_schedule and the
napi code will crash the system because the ag->napi is not yet
initialized.
The gmcc0/gmac1 must be brought in a state in which it doesn't signal a
AG71XX_INT_POLL related status bits as interrupt before registering the
interrupt handler. ag71xx_hw_start will take care of re-initializing the
AG71XX_REG_INT_ENABLE.
This will become relevant when dual GMAC devices get added here.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://patch.msgid.link/20240905194938.8453-8-rosenp@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/atheros/ag71xx.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c index e28a4b018b11..96a6189cc31e 100644 --- a/drivers/net/ethernet/atheros/ag71xx.c +++ b/drivers/net/ethernet/atheros/ag71xx.c @@ -1850,6 +1850,12 @@ static int ag71xx_probe(struct platform_device *pdev) if (!ag->mac_base) return -ENOMEM; + /* ensure that HW is in manual polling mode before interrupts are + * activated. Otherwise ag71xx_interrupt might call napi_schedule + * before it is initialized by netif_napi_add. + */ + ag71xx_int_disable(ag, AG71XX_INT_POLL); + ndev->irq = platform_get_irq(pdev, 0); err = devm_request_irq(&pdev->dev, ndev->irq, ag71xx_interrupt, 0x0, dev_name(&pdev->dev), ndev); |