From: Suman Anna <s-anna@xxxxxx> The PRU remoteproc driver is not configured for 'auto-boot' by default, and allows to be booted either by in-kernel PRU client drivers or by userspace using the generic remoteproc sysfs interfaces. The sysfs interfaces should not be permitted to change the remoteproc firmwares or states when a PRU is being managed by an in-kernel client driver. Use the newly introduced remoteproc generic 'sysfs_read_only' flag to provide these restrictions by setting and clearing it appropriately during the PRU acquire and release steps. Signed-off-by: Suman Anna <s-anna@xxxxxx> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx> Signed-off-by: Puranjay Mohan <p-mohan@xxxxxx> --- drivers/remoteproc/pru_rproc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index 7a35b400287a..9fed3e0372d3 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -231,6 +231,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index, } pru->client_np = np; + rproc->sysfs_read_only = true; mutex_unlock(&pru->lock); @@ -265,6 +266,7 @@ void pru_rproc_put(struct rproc *rproc) } pru->client_np = NULL; + rproc->sysfs_read_only = false; mutex_unlock(&pru->lock); put_device(&rproc->dev); -- 2.17.1
