| Message ID | 20211123011640.528936-1-elder@linaro.org (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | e4e9bfb7c93d7e78aa4ad7e1c411a8df15386062 |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [net] net: ipa: kill ipa_cmd_pipeline_clear() | expand |
Hello: This patch was applied to netdev/net.git (master) by David S. Miller <davem@davemloft.net>: On Mon, 22 Nov 2021 19:16:40 -0600 you wrote: > 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. > > [...] Here is the summary with links: - [net] net: ipa: kill ipa_cmd_pipeline_clear() https://git.kernel.org/netdev/net/c/e4e9bfb7c93d You are awesome, thank you!
diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c index cff51731195aa..d57472ea077f2 100644 --- a/drivers/net/ipa/ipa_cmd.c +++ b/drivers/net/ipa/ipa_cmd.c @@ -661,22 +661,6 @@ 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 69cd085d427db..05ed7e42e1842 100644 --- a/drivers/net/ipa/ipa_cmd.h +++ b/drivers/net/ipa/ipa_cmd.h @@ -163,12 +163,6 @@ 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 ef790fd0ab56a..03a1709934208 100644 --- a/drivers/net/ipa/ipa_endpoint.c +++ b/drivers/net/ipa/ipa_endpoint.c @@ -1636,8 +1636,6 @@ 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]); }
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> --- 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(-)