[PATCH 1/1] drm/amdgpu/display: use GFP_ATOMIC in dcn20_validate_bandwidth_internal

From: Daniel Kolesa <daniel@octaforge.org>
To: amd-gfx@lists.freedesktop.org
Cc: Daniel Kolesa <daniel@octaforge.org>
Subject: [PATCH 1/1] drm/amdgpu/display: use GFP_ATOMIC in dcn20_validate_bandwidth_internal
Date: Sat,  8 Aug 2020 22:42:35 +0200	[thread overview]
Message-ID: <20200808204235.12313-2-daniel@octaforge.org> (raw)
In-Reply-To: <20200808204235.12313-1-daniel@octaforge.org>

GFP_KERNEL may and will sleep, and this is being executed in
a non-preemptible context; this will mess things up since it's
called inbetween DC_FP_START/END, and rescheduling will result
in the DC_FP_END later being called in a different context (or
just crashing if any floating point/vector registers/instructions
are used after the call is resumed in a different context).

Signed-off-by: Daniel Kolesa <daniel@octaforge.org>
---
 drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
index 991eddd10952..c31d1f30e505 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c
@@ -3141,7 +3141,7 @@ static bool dcn20_validate_bandwidth_internal(struct dc *dc, struct dc_state *co
 	int vlevel = 0;
 	int pipe_split_from[MAX_PIPES];
 	int pipe_cnt = 0;
-	display_e2e_pipe_params_st *pipes = kzalloc(dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st), GFP_KERNEL);
+	display_e2e_pipe_params_st *pipes = kzalloc(dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st), GFP_ATOMIC);
 	DC_LOGGER_INIT(dc->ctx->logger);
 
 	BW_VAL_TRACE_COUNT();
-- 
2.28.0

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