From 57a6a37fcdb808368e311a0096737f458dae8434 Mon Sep 17 00:00:00 2001
From: Alex Elder <elder@linaro.org>
Date: Mon, 22 Nov 2021 19:16:40 -0600
Subject: [PATCH 01/19] net: ipa: kill ipa_cmd_pipeline_clear()
Git-commit: e4e9bfb7c93d7e78aa4ad7e1c411a8df15386062
Patch-mainline: v5.16-rc3
References: git-fixes
Calling ipa_cmd_pipeline_clear() after stopping the channel
underlying the AP<-modem RX endpoint can lead to a deadlock.
This occurs in the ->runtime_suspend device power operation for the
IPA driver. While this callback is in progress, any other requests
for power will block until the callback returns.
Stopping the AP<-modem RX channel does not prevent the modem from
sending another packet to this endpoint. If a packet arrives for an
RX channel when the channel is stopped, an SUSPEND IPA interrupt
condition will be pending. Handling an IPA interrupt requires
power, so ipa_isr_thread() calls pm_runtime_get_sync() first thing.
The problem occurs because a "pipeline clear" command will not
complete while such a SUSPEND interrupt condition exists. So the
SUSPEND IPA interrupt handler won't proceed until it gets power;
that won't happen until the ->runtime_suspend callback (and its
"pipeline clear" command) completes; and that can't happen while
the SUSPEND interrupt condition exists.
It turns out that in this case there is no need to use the "pipeline
clear" command. There are scenarios in which clearing the pipeline
is required while suspending, but those are not (yet) supported
upstream. So a simple fix, avoiding the potential deadlock, is to
stop calling ipa_cmd_pipeline_clear() in ipa_endpoint_suspend().
This removes the only user of ipa_cmd_pipeline_clear(), so get rid
of that function. It can be restored again whenever it's needed.
This is basically a manual revert along with an explanation for
commit 6cb63ea6a39ea ("net: ipa: introduce ipa_cmd_tag_process()").
Fixes: 6cb63ea6a39ea ("net: ipa: introduce ipa_cmd_tag_process()")
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/ipa/ipa_cmd.c | 16 ----------------
drivers/net/ipa/ipa_cmd.h | 6 ------
drivers/net/ipa/ipa_endpoint.c | 2 --
3 files changed, 24 deletions(-)
diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index bda8677eae88..1d4d4c247897 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -664,22 +664,6 @@ void ipa_cmd_pipeline_clear_wait(struct ipa *ipa)
wait_for_completion(&ipa->completion);
}
-void ipa_cmd_pipeline_clear(struct ipa *ipa)
-{
- u32 count = ipa_cmd_pipeline_clear_count();
- struct gsi_trans *trans;
-
- trans = ipa_cmd_trans_alloc(ipa, count);
- if (trans) {
- ipa_cmd_pipeline_clear_add(trans);
- gsi_trans_commit_wait(trans);
- ipa_cmd_pipeline_clear_wait(ipa);
- } else {
- dev_err(&ipa->pdev->dev,
- "error allocating %u entry tag transaction\n", count);
- }
-}
-
static struct ipa_cmd_info *
ipa_cmd_info_alloc(struct ipa_endpoint *endpoint, u32 tre_count)
{
diff --git a/drivers/net/ipa/ipa_cmd.h b/drivers/net/ipa/ipa_cmd.h
index ea723419c826..cbea68d94c51 100644
--- a/drivers/net/ipa/ipa_cmd.h
+++ b/drivers/net/ipa/ipa_cmd.h
@@ -174,12 +174,6 @@ u32 ipa_cmd_pipeline_clear_count(void);
*/
void ipa_cmd_pipeline_clear_wait(struct ipa *ipa);
-/**
- * ipa_cmd_pipeline_clear() - Clear the hardware pipeline
- * @ipa: - IPA pointer
- */
-void ipa_cmd_pipeline_clear(struct ipa *ipa);
-
/**
* ipa_cmd_trans_alloc() - Allocate a transaction for the command TX endpoint
* @ipa: IPA pointer
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 7b8d0f560534..5182907c9c18 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1653,8 +1653,6 @@ void ipa_endpoint_suspend(struct ipa *ipa)
if (ipa->modem_netdev)
ipa_modem_suspend(ipa->modem_netdev);
- ipa_cmd_pipeline_clear(ipa);
-
ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_LAN_RX]);
ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX]);
}
--
2.16.4