Hi!
> [ Upstream commit 0571a753cb07982cc82f4a5115e0b321da89e1f3 ]
>
> pxa168_eth_remove() firstly calls unregister_netdev(),
> then cancels a timeout work. unregister_netdev() shuts down a device
> interface and removes it from the kernel tables. If the timeout occurs
> in parallel, the timeout work (pxa168_eth_tx_timeout_task) performs stop
> and open of the device. It may lead to an inconsistent state and memory
> leaks.
AFAICT the timeout work does a lot of processing, including
pxa168_eth_open(), pxa168_init_phy() and phy_connect_direct(). We
probably don't want that to run with clock being disabled and DMA
being unmapped.
We certainly don't want phy_disconnect() being undone by
phy_connect_direct() running in the workqueue.
IOW this patch is not enough to fix the bugs, and at least fix below
is needed to get something reasonable.
Signed-off-by: Pavel Machek (CIP) <pavel@xxxxxxx>
Best regards,
Pavel
> +++ b/drivers/net/ethernet/marvell/pxa168_eth.c
> @@ -1544,8 +1544,8 @@ static int pxa168_eth_remove(struct platform_device *pdev)
> clk_disable_unprepare(pep->clk);
> mdiobus_unregister(pep->smi_bus);
> mdiobus_free(pep->smi_bus);
> - unregister_netdev(dev);
> cancel_work_sync(&pep->tx_timeout_task);
> + unregister_netdev(dev);
> free_netdev(dev);
> return 0;
> }
diff --git a/drivers/net/ethernet/marvell/pxa168_eth.c b/drivers/net/ethernet/marvell/pxa168_eth.c
index d1e4d42e497d..432be22a51be 100644
--- a/drivers/net/ethernet/marvell/pxa168_eth.c
+++ b/drivers/net/ethernet/marvell/pxa168_eth.c
@@ -1532,7 +1532,8 @@ static int pxa168_eth_remove(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct pxa168_eth_private *pep = netdev_priv(dev);
-
+
+ cancel_work_sync(&pep->tx_timeout_task);
if (pep->htpr) {
dma_free_coherent(pep->dev->dev.parent, HASH_ADDR_TABLE_SIZE,
pep->htpr, pep->htpr_dma);
@@ -1545,7 +1546,6 @@ static int pxa168_eth_remove(struct platform_device *pdev)
mdiobus_unregister(pep->smi_bus);
mdiobus_free(pep->smi_bus);
unregister_netdev(dev);
- cancel_work_sync(&pep->tx_timeout_task);
free_netdev(dev);
return 0;
}
--
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