On Mon, Oct 21, 2019 at 11:58:20AM +0100, Lee Jones wrote:
> If a child device calls mfd_cell_{en,dis}able() without an appropriate
> call-back being set, we are likely to encounter a panic.  Avoid this
> by adding suitable checking.
> 
> Signed-off-by: Lee Jones <lee.jo...@linaro.org>
> ---
>  drivers/mfd/mfd-core.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
> index 8126665bb2d8..90b43b44a15a 100644
> --- a/drivers/mfd/mfd-core.c
> +++ b/drivers/mfd/mfd-core.c
> @@ -28,6 +28,11 @@ int mfd_cell_enable(struct platform_device *pdev)
>       const struct mfd_cell *cell = mfd_get_cell(pdev);
>       int err = 0;
>  
> +     if (!cell->enable) {
> +             dev_dbg(&pdev->dev, "No .enable() call-back registered\n");
> +             return 0;
> +     }
> +
>       /* only call enable hook if the cell wasn't previously enabled */
>       if (atomic_inc_return(cell->usage_count) == 1)
>               err = cell->enable(pdev);
> @@ -45,6 +50,11 @@ int mfd_cell_disable(struct platform_device *pdev)
>       const struct mfd_cell *cell = mfd_get_cell(pdev);
>       int err = 0;
>  
> +     if (!cell->enable) {

Oops.

Cancel the R-B: ;-). Shouldn't this be !cell->disable() ?


Daniel.



> +             dev_dbg(&pdev->dev, "No .disable() call-back registered\n");
> +             return 0;
> +     }
> +
>       /* only disable if no other clients are using it */
>       if (atomic_dec_return(cell->usage_count) == 0)
>               err = cell->disable(pdev);
> -- 
> 2.17.1
> 

Reply via email to