Guenter Roeck <linux@xxxxxxxxxxxx> 于2023年3月11日周六 00:34写道：
>
> On Fri, Mar 10, 2023 at 04:40:07PM +0800, Zheng Wang wrote:
> > In xgene_hwmon_probe, &ctx->workq is bound with
> > xgene_hwmon_evt_work. Then it will be started.
> >
> > If we remove the driver which will call
> > xgene_hwmon_remove to make cleanup, there may
> > be a unfinished work.
> >
> > The possiblesequence is as follows:
> >
> > Fix it by finishing the work before cleanup in the
> > xgene_hwmon_remove
> >
> > CPU0 CPU1
> >
> > |xgene_hwmon_evt_work
> > xgene_hwmon_remove |
> > kfifo_free(&ctx->async_msg_fifo);|
> > |
> > |kfifo_out_spinlocked
> > |//use &ctx->async_msg_fifo
> > Fixes: 2ca492e22cb7 ("hwmon: (xgene) Fix crash when alarm occurs before driver probe")
> > Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
>
> Applied.
>
Thanks for your effort.
Best regards,
Zheng
>
> > ---
> > drivers/hwmon/xgene-hwmon.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/hwmon/xgene-hwmon.c b/drivers/hwmon/xgene-hwmon.c
> > index 5cde837bfd09..d1abea49f01b 100644
> > --- a/drivers/hwmon/xgene-hwmon.c
> > +++ b/drivers/hwmon/xgene-hwmon.c
> > @@ -761,6 +761,7 @@ static int xgene_hwmon_remove(struct platform_device *pdev)
> > {
> > struct xgene_hwmon_dev *ctx = platform_get_drvdata(pdev);
> >
> > + cancel_work_sync(&ctx->workq);
> > hwmon_device_unregister(ctx->hwmon_dev);
> > kfifo_free(&ctx->async_msg_fifo);
> > if (acpi_disabled)
