[PATCH] misc: fastrpc: Allocate message buffer from remote heap for sensors PD

[Piyush Raj Chouhan]

The sensors protection domain reaches the message buffer directly rather
than through its context bank, so it requires an allocation from the
reserved remote heap memory pool. Using a context-bank buffer allocation
leaves the DSP addressing memory that is not mapped in its address space,
triggering an SMMU context fault (e.g. 0x1fffff000) or bus stall.

Ensure the remote heap is used for SENSORS_PD invocations even when
a stream ID (sid) is present.

Suggested-by: Robin Snyders <robin@xxxxxxxxxxx>
Signed-off-by: Piyush Raj Chouhan <pc1598@xxxxxxxxxxxxxx>
---
 drivers/misc/fastrpc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index d4fac2caca86..8f39f4bed20e 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1099,7 +1099,7 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 
 	ctx->msg_sz = pkt_size;
 
-	if (ctx->fl->sctx->sid)
+	if (ctx->fl->sctx->sid && ctx->fl->pd != SENSORS_PD)
 		err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
 	else
 		err = fastrpc_remote_heap_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
-- 
2.55.0