Before removing the driver, flush inter-function communication
work, and subsequent communication work is not processed.
This prevents communication threads from accessing released memory.
Fixes: ("crypto: hisilicon/qm - enable PF and VFs communication")
Signed-off-by: Weili Qian <qianweili@xxxxxxxxxx>
---
drivers/crypto/hisilicon/qm.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index edc6fd44e7ca..81c21ca40375 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -954,6 +954,11 @@ static irqreturn_t qm_mb_cmd_irq(int irq, void *data)
if (!val)
return IRQ_NONE;
+ if (test_bit(QM_DRIVER_REMOVING, &qm->misc_ctl)) {
+ dev_warn(&qm->pdev->dev, "Driver is down, message cannot be processed!\n");
+ return IRQ_HANDLED;
+ }
+
schedule_work(&qm->cmd_process);
return IRQ_HANDLED;
@@ -2743,6 +2748,9 @@ void hisi_qm_wait_task_finish(struct hisi_qm *qm, struct hisi_qm_list *qm_list)
test_bit(QM_RESETTING, &qm->misc_ctl))
msleep(WAIT_PERIOD);
+ if (test_bit(QM_SUPPORT_MB_COMMAND, &qm->caps))
+ flush_work(&qm->cmd_process);
+
udelay(REMOVE_WAIT_DELAY);
}
EXPORT_SYMBOL_GPL(hisi_qm_wait_task_finish);
--
2.33.0
