On Wed, Aug 26, 2020 at 08:14:59PM +0530, madhuparnabhowmik10@xxxxxxxxx wrote:
> From: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx>
>
> Currently in c67x00_drv_probe() IRQ is requested before calling
> c67x00_probe_sie() and hence if interrupt happens the reading of certain
> variables in the handler can race with initialization of the variables,
> for e.g. sie->sie_num is written in c67x00_probe_sie() and read in
> c67x00_hcd_irq().
> Hence, this patch calls c67x00_probe_sie() before requesting IRQ in
> probe.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx>
> ---
> drivers/usb/c67x00/c67x00-drv.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/c67x00/c67x00-drv.c b/drivers/usb/c67x00/c67x00-drv.c
> index 53838e7d4eef..2e816d5ca0eb 100644
> --- a/drivers/usb/c67x00/c67x00-drv.c
> +++ b/drivers/usb/c67x00/c67x00-drv.c
> @@ -146,6 +146,9 @@ static int c67x00_drv_probe(struct platform_device *pdev)
> c67x00_ll_init(c67x00);
> c67x00_ll_hpi_reg_init(c67x00);
>
> + for (i = 0; i < C67X00_SIES; i++)
> + c67x00_probe_sie(&c67x00->sie[i], c67x00, i);
> +
> ret = request_irq(res2->start, c67x00_irq, 0, pdev->name, c67x00);
> if (ret) {
> dev_err(&pdev->dev, "Cannot claim IRQ\n");
> @@ -158,9 +161,6 @@ static int c67x00_drv_probe(struct platform_device *pdev)
> goto reset_failed;
> }
>
> - for (i = 0; i < C67X00_SIES; i++)
> - c67x00_probe_sie(&c67x00->sie[i], c67x00, i);
> -
> platform_set_drvdata(pdev, c67x00);
>
> return 0;
Have you tested this on hardware to verify it works properly?
thanks,
greg k-h
