linux-kernel - [PATCH 3/6] misc: fastrpc: Avoid updating PD type for capability request

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Date: Fri, 28 Jun 2024 12:44:58 +0100
From: srinivas.kandagatla@...aro.org
To: gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org,
	Ekansh Gupta <quic_ekangupt@...cinc.com>,
	stable <stable@...nel.org>,
	Caleb Connolly <caleb.connolly@...aro.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 3/6] misc: fastrpc: Avoid updating PD type for capability request

From: Ekansh Gupta <quic_ekangupt@...cinc.com>

When user is requesting for DSP capability, the process pd type is
getting updated to USER_PD which is incorrect as DSP will assume the
process which is making the request is a user PD and this will never
get updated back to the original value. The actual PD type should not
be updated for capability request and it should be serviced by the
respective PD on DSP side. Don't change process's PD type for DSP
capability request.

Fixes: 6c16fd8bdd40 ("misc: fastrpc: Add support to get DSP capabilities")
Cc: stable <stable@...nel.org>
Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
Reviewed-by: Caleb Connolly <caleb.connolly@...aro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/misc/fastrpc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 30b93012877f..3fef3eecb88c 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1707,7 +1707,6 @@ static int fastrpc_get_info_from_dsp(struct fastrpc_user *fl, uint32_t *dsp_attr
 	args[1].ptr = (u64)(uintptr_t)&dsp_attr_buf[1];
 	args[1].length = dsp_attr_buf_len * sizeof(u32);
 	args[1].fd = -1;
-	fl->pd = USER_PD;
 
 	return fastrpc_internal_invoke(fl, true, FASTRPC_DSP_UTILITIES_HANDLE,
 				       FASTRPC_SCALARS(0, 1, 1), args);
-- 
2.25.1