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msm: ipa3: Update channel start as success in flow control state
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Observing race condition when we are starting the channel and
modem trying to offload flow_control on same channel. Add changes
to retrun success if channel state is flow control when trying to
start the channel.

Change-Id: Id254cd0e3e17c74e931d27cb96577224559c091e
Signed-off-by: Praveen Kurapati <[email protected]>
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Praveen Kurapati committed Aug 8, 2019
1 parent a92c2f5 commit eb922cd
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Showing 2 changed files with 6 additions and 3 deletions.
6 changes: 4 additions & 2 deletions drivers/platform/msm/gsi/gsi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -175,7 +175,8 @@ static void gsi_channel_state_change_wait(unsigned long chan_hdl,
}

if (op == GSI_CH_START) {
if (curr_state == GSI_CHAN_STATE_STARTED) {
if (curr_state == GSI_CHAN_STATE_STARTED ||
curr_state == GSI_CHAN_STATE_FLOW_CONTROL) {
ctx->state = curr_state;
return;
}
Expand Down Expand Up @@ -2697,7 +2698,8 @@ int gsi_start_channel(unsigned long chan_hdl)
ctx,
GSI_START_CMD_TIMEOUT_MS, op);

if (ctx->state != GSI_CHAN_STATE_STARTED) {
if (ctx->state != GSI_CHAN_STATE_STARTED &&
ctx->state != GSI_CHAN_STATE_FLOW_CONTROL) {
/*
* Hardware returned unexpected status, unexpected
* hardware state.
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3 changes: 2 additions & 1 deletion drivers/platform/msm/gsi/gsi.h
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
/* Copyright (c) 2015-2019, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
Expand Down Expand Up @@ -90,6 +90,7 @@ enum gsi_chan_state {
GSI_CHAN_STATE_STARTED = 0x2,
GSI_CHAN_STATE_STOPPED = 0x3,
GSI_CHAN_STATE_STOP_IN_PROC = 0x4,
GSI_CHAN_STATE_FLOW_CONTROL = 0x5,
GSI_CHAN_STATE_ERROR = 0xf
};

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4 comments on commit eb922cd

@kholk
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@kholk kholk commented on eb922cd Jul 29, 2020

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This one may fix or may spectacularly break the fragile Yoshino platform: please test it carefully!

@stefanhh0
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It already runs on yoshino/lilac and I have not seen any regression so far. I will do more reboot tests and report back

So maybe it is the the last missing piece for fixing sonyxperiadev/bug_tracker#580?

@stefanhh0
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After several reboots the issue is back, so sonyxperiadev/bug_tracker#580 has not been fixed implicitly by the commit.

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As well not a real change, it has been cherry-picked earlier: 96c6d1b

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