From: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> As fastrpc_rpmsg_remove() returns the rpdev of the channel context is no longer a valid object, so ensure to update the channel context to no longer reference the old object and guard in the invoke code path against dereferencing it. TEST=stop and start remote proc1 using sysfs Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> Signed-off-by: Mayank Chopra <mak.chopra@xxxxxxxxxxxxxx> Signed-off-by: Abhinav Asati <asatiabhi@xxxxxxxxxxxxxx> Signed-off-by: Vamsi Singamsetty <vamssi@xxxxxxxxxxxxxx> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> --- drivers/misc/fastrpc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index c019e867e7fa..59ee6de26229 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -913,6 +913,9 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, if (!fl->sctx) return -EINVAL; + if (!fl->cctx->rpdev) + return -EPIPE; + ctx = fastrpc_context_alloc(fl, kernel, sc, args); if (IS_ERR(ctx)) return PTR_ERR(ctx); @@ -1495,6 +1498,7 @@ static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) misc_deregister(&cctx->miscdev); of_platform_depopulate(&rpdev->dev); + cctx->rpdev = NULL; fastrpc_channel_ctx_put(cctx); } -- 2.21.0
