diff options
Diffstat (limited to 'target/linux')
| -rw-r--r-- | target/linux/rb532/patches-4.4/100-korina_fix_napi_disable.patch | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/target/linux/rb532/patches-4.4/100-korina_fix_napi_disable.patch b/target/linux/rb532/patches-4.4/100-korina_fix_napi_disable.patch new file mode 100644 index 0000000000..3f80e0937d --- /dev/null +++ b/target/linux/rb532/patches-4.4/100-korina_fix_napi_disable.patch @@ -0,0 +1,56 @@ +From 5833532b49820aa221248f296c207cc50d20ca2d Mon Sep 17 00:00:00 2001 +From: Florian Fainelli <f.fainelli@gmail.com> +Date: Fri, 23 Dec 2016 19:36:31 -0800 +Subject: [PATCH net] net: korina: Fix NAPI versus resources freeing + +Commit beb0babfb77e ("korina: disable napi on close and restart") +introduced calls to napi_disable() that were missing before, +unfortunately this leaves a small window during which NAPI has a chance +to run, yet we just freed resources since korina_free_ring() has been +called: + +Fix this by disabling NAPI first then freeing resource, and make sure +that we also cancel the restart taks before doing the resource freeing. + +Fixes: beb0babfb77e ("korina: disable napi on close and restart") +Reported-by: Alexandros C. Couloumbis <alex@ozo.com> +Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> +--- + drivers/net/ethernet/korina.c | 8 ++++---- + 1 file changed, 4 insertions(+), 4 deletions(-) + +diff --git a/drivers/net/ethernet/korina.c b/drivers/net/ethernet/korina.c +index cbeea915f026..8037426ec50f 100644 +--- a/drivers/net/ethernet/korina.c ++++ b/drivers/net/ethernet/korina.c +@@ -900,10 +900,10 @@ static void korina_restart_task(struct work_struct *work) + DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR, + &lp->rx_dma_regs->dmasm); + +- korina_free_ring(dev); +- + napi_disable(&lp->napi); + ++ korina_free_ring(dev); ++ + if (korina_init(dev) < 0) { + printk(KERN_ERR "%s: cannot restart device\n", dev->name); + return; +@@ -1064,12 +1064,12 @@ static int korina_close(struct net_device *dev) + tmp = tmp | DMA_STAT_DONE | DMA_STAT_HALT | DMA_STAT_ERR; + writel(tmp, &lp->rx_dma_regs->dmasm); + +- korina_free_ring(dev); +- + napi_disable(&lp->napi); + + cancel_work_sync(&lp->restart_task); + ++ korina_free_ring(dev); ++ + free_irq(lp->rx_irq, dev); + free_irq(lp->tx_irq, dev); + free_irq(lp->ovr_irq, dev); +-- +2.9.3 + |