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gpu: nvgpu: tsg: ensure unbound channel is disabled

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Multiple threads could be unbinding different channels from
the same tsg at the same time. At the point where we
remove the channel from the tsg's channel list, call
disable_channel again, in case another thread had
re-enabled the channel after we had disabled it.

Bug 200404549

Change-Id: I9abbc08dc11fe1f7a0abada88376c0ef96b56610
Signed-off-by: Peter Daifuku <pdaifuku@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2083337
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Satish Arora <satisha@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Peter Daifuku
2019-03-27 17:15:00 -07:00
committed by mobile promotions
parent e00804594b
commit 9e329ca39b
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
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@@ -1,7 +1,7 @@
/*
* GK20A Graphics FIFO (gr host)
*
* Copyright (c) 2011-2018, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2011-2019, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -2193,6 +2193,11 @@ int gk20a_fifo_tsg_unbind_channel(struct channel_gk20a *ch)
nvgpu_rwsem_down_write(&tsg->ch_list_lock);
nvgpu_list_del(&ch->ch_entry);
ch->tsgid = NVGPU_INVALID_TSG_ID;
/* another thread could have re-enabled the channel because it was
* still on the list at that time, so make sure it's truly disabled
*/
g->ops.fifo.disable_channel(ch);
nvgpu_rwsem_up_write(&tsg->ch_list_lock);
/*