[PATCH net] net: e100: cancel timeout work during removal

[PATCH net] net: e100: cancel timeout work during removal

[Hongyan Xu]

Transmit timeout and command submission paths can queue tx_timeout_task.
The worker accesses the MMIO mapping and netdev private state, but
device removal releases both without draining a pending instance.

Cancel the work after unregister_netdev(), when the network stack can no
longer publish it and after any RTNL serialization used by the worker
has completed.

Fixes: 2acdb1e05c1a ("[PATCH] e100: Execute tx_timeout task outside interrupt context")
Signed-off-by: Hongyan Xu <getshell@seu.edu.cn>
---
 drivers/net/ethernet/intel/e100.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 29960762e64a..710c2c30d9ed 100644
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -2988,6 +2988,7 @@ static void e100_remove(struct pci_dev *pdev)
 	if (netdev) {
 		struct nic *nic = netdev_priv(netdev);
 		unregister_netdev(netdev);
+		cancel_work_sync(&nic->tx_timeout_task);
 		e100_free(nic);
 		pci_iounmap(pdev, nic->csr);
 		dma_pool_destroy(nic->cbs_pool);
-- 
2.50.1.windows.1

Re: [PATCH net] net: e100: cancel timeout work during removal

[netdev-bot+sinfo]

Hi!

This is an automated message. This series looks like a fix, but its
commit messages seem to be missing some information:

 - How the issue was discovered, e.g. hit in production, hit during
   development, syzbot report, manual code inspection, LLM or static
   analysis tool scan.

 - Whether the issue was actually triggered, or is only theoretical
   (e.g. found by code inspection). If it was triggered please include
   the symptoms, like the stack trace or error messages.

 - What hardware the change was tested on. For driver fixes please
   mention the device (and if relevant firmware version) used for
   testing, or say that the change was not tested on real hardware.

Please do not repost the series just to address the above. Instead,
reply to this email with the missing information, so that reviewers
can take it into account. If the series needs another revision for
other reasons, please include the information in the commit messages
then.

The evaluation is done by an LLM so it may be wrong, if you think
that is the case please reply and explain.