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qede: fix crash in rmmod qede while automatic debug collection

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A crash has been observed if rmmod is done while automatic debug
collection in progress. It is due to a race  condition between
both of them.

To fix stop the sp_task during unload to avoid running qede_sp_task
even if they are schedule during removal process.

Signed-off-by: Alok Prasad <palok@marvell.com>
Signed-off-by: Shai Malin <smalin@marvell.com>
Signed-off-by: Ariel Elior <aelior@marvell.com>
Signed-off-by: Prabhakar Kushwaha <pkushwaha@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Prabhakar Kushwaha 2021-07-29 14:43:06 +03:00 committed by David S. Miller
parent c7d1022326
commit 1159e25c13
2 changed files with 9 additions and 0 deletions
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1
drivers/net/ethernet/qlogic/qede/qede.h
View file

@ -501,6 +501,7 @@ struct qede_fastpath {
#define QEDE_SP_HW_ERR 4
#define QEDE_SP_ARFS_CONFIG 5
#define QEDE_SP_AER 7
#define QEDE_SP_DISABLE 8
#ifdef CONFIG_RFS_ACCEL
int qede_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,

8
drivers/net/ethernet/qlogic/qede/qede_main.c
View file

@ -1009,6 +1009,13 @@ static void qede_sp_task(struct work_struct *work)
struct qede_dev *edev = container_of(work, struct qede_dev,
sp_task.work);
/* Disable execution of this deferred work once
* qede removal is in progress, this stop any future
* scheduling of sp_task.
*/
if (test_bit(QEDE_SP_DISABLE, &edev->sp_flags))
return;
/* The locking scheme depends on the specific flag:
* In case of QEDE_SP_RECOVERY, acquiring the RTNL lock is required to
* ensure that ongoing flows are ended and new ones are not started.
@ -1300,6 +1307,7 @@ static void __qede_remove(struct pci_dev *pdev, enum qede_remove_mode mode)
qede_rdma_dev_remove(edev, (mode == QEDE_REMOVE_RECOVERY));
if (mode != QEDE_REMOVE_RECOVERY) {
set_bit(QEDE_SP_DISABLE, &edev->sp_flags);
unregister_netdev(ndev);
cancel_delayed_work_sync(&edev->sp_task);