From: Lendacky, Thomas Date: Thu, 9 Mar 2017 23:48:23 +0000 (-0600) Subject: amd-xgbe: Enable IRQs only if napi_complete_done() is true X-Git-Tag: v5.15~11676^2~27 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d7aba644ffdebf756e51e26a2229055211838e89;p=platform%2Fkernel%2Flinux-starfive.git amd-xgbe: Enable IRQs only if napi_complete_done() is true Depending on the hardware, the amd-xgbe driver may use disable_irq_nosync() and enable_irq() when an interrupt is received to process Rx packets. If the napi_complete_done() return value isn't checked an unbalanced enable for the IRQ could result, generating a warning stack trace. Update the driver to only enable interrupts if napi_complete_done() returns true. Reported-by: Jeremy Linton Signed-off-by: Tom Lendacky Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c index 248f60d171a5..ffea9859f5a7 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c @@ -2272,10 +2272,7 @@ static int xgbe_one_poll(struct napi_struct *napi, int budget) processed = xgbe_rx_poll(channel, budget); /* If we processed everything, we are done */ - if (processed < budget) { - /* Turn off polling */ - napi_complete_done(napi, processed); - + if ((processed < budget) && napi_complete_done(napi, processed)) { /* Enable Tx and Rx interrupts */ if (pdata->channel_irq_mode) xgbe_enable_rx_tx_int(pdata, channel); @@ -2317,10 +2314,7 @@ static int xgbe_all_poll(struct napi_struct *napi, int budget) } while ((processed < budget) && (processed != last_processed)); /* If we processed everything, we are done */ - if (processed < budget) { - /* Turn off polling */ - napi_complete_done(napi, processed); - + if ((processed < budget) && napi_complete_done(napi, processed)) { /* Enable Tx and Rx interrupts */ xgbe_enable_rx_tx_ints(pdata); }