On Fri 04 Oct 05:02 PDT 2019, Fabien Dessenne wrote:
> If the rproc driver is probed before the mailbox driver and if the rproc
> Device Tree node has some mailbox properties, the rproc driver probe
> shall be deferred instead of being probed without mailbox support.
>
> Signed-off-by: Fabien Dessenne <fabien.desse...@st.com>
> ---
> drivers/remoteproc/stm32_rproc.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/remoteproc/stm32_rproc.c
> b/drivers/remoteproc/stm32_rproc.c
> index 2cf4b29..410b794 100644
> --- a/drivers/remoteproc/stm32_rproc.c
> +++ b/drivers/remoteproc/stm32_rproc.c
> @@ -310,7 +310,7 @@ static const struct stm32_mbox
> stm32_rproc_mbox[MBOX_NB_MBX] = {
> }
> };
>
> -static void stm32_rproc_request_mbox(struct rproc *rproc)
> +static int stm32_rproc_request_mbox(struct rproc *rproc)
> {
> struct stm32_rproc *ddata = rproc->priv;
> struct device *dev = &rproc->dev;
> @@ -328,11 +328,15 @@ static void stm32_rproc_request_mbox(struct rproc
> *rproc)
> cl->dev = dev->parent;
>
> ddata->mb[i].chan = mbox_request_channel_byname(cl, name);
> - if (IS_ERR(ddata->mb[i].chan)) {
> + if (PTR_ERR(ddata->mb[i].chan) == -EPROBE_DEFER) {
You may not use PTR_ERR() without first checking IS_ERR(), apart from
that your patch looks good.
Regards,
Bjorn
> + return -EPROBE_DEFER;
> + } else if (IS_ERR(ddata->mb[i].chan)) {
> dev_warn(dev, "cannot get %s mbox\n", name);
> ddata->mb[i].chan = NULL;
> }
> }
> +
> + return 0;
> }
>
> static int stm32_rproc_set_hold_boot(struct rproc *rproc, bool hold)
> @@ -596,7 +600,9 @@ static int stm32_rproc_probe(struct platform_device *pdev)
> if (ret)
> goto free_rproc;
>
> - stm32_rproc_request_mbox(rproc);
> + ret = stm32_rproc_request_mbox(rproc);
> + if (ret)
> + goto free_rproc;
>
> ret = rproc_add(rproc);
> if (ret)
> --
> 2.7.4
>
