Re: [PATCH v6 2/2] rpmsg: char: Fix race between the release of rpmsg_eptdev and cdev

[Stephen Boyd]

Quoting Matthias Kaehlcke (2022-01-10 10:47:37)
> struct rpmsg_eptdev contains a struct cdev. The current code frees
> the rpmsg_eptdev struct in rpmsg_eptdev_destroy(), but the cdev is
> a managed object, therefore its release is not predictable and the
> rpmsg_eptdev could be freed before the cdev is entirely released.
>
> The cdev_device_add/del() API was created to address this issue
> (see commit 233ed09d7fda), use it instead of cdev add/del().
>
> Fixes: c0cdc19f84a4 ("rpmsg: Driver for user space endpoint interface")
> Suggested-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> ---

Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>