a20e6149b3
Deleted (upstreamed) patches: mediatek/patches-5.10/000-spi-fix-fifo.patch Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
54 lines
2.0 KiB
Diff
54 lines
2.0 KiB
Diff
From: Paolo Abeni <pabeni@redhat.com>
|
|
Date: Fri, 9 Apr 2021 17:24:17 +0200
|
|
Subject: [PATCH] net: fix hangup on napi_disable for threaded napi
|
|
|
|
napi_disable() is subject to an hangup, when the threaded
|
|
mode is enabled and the napi is under heavy traffic.
|
|
|
|
If the relevant napi has been scheduled and the napi_disable()
|
|
kicks in before the next napi_threaded_wait() completes - so
|
|
that the latter quits due to the napi_disable_pending() condition,
|
|
the existing code leaves the NAPI_STATE_SCHED bit set and the
|
|
napi_disable() loop waiting for such bit will hang.
|
|
|
|
This patch addresses the issue by dropping the NAPI_STATE_DISABLE
|
|
bit test in napi_thread_wait(). The later napi_threaded_poll()
|
|
iteration will take care of clearing the NAPI_STATE_SCHED.
|
|
|
|
This also addresses a related problem reported by Jakub:
|
|
before this patch a napi_disable()/napi_enable() pair killed
|
|
the napi thread, effectively disabling the threaded mode.
|
|
On the patched kernel napi_disable() simply stops scheduling
|
|
the relevant thread.
|
|
|
|
v1 -> v2:
|
|
- let the main napi_thread_poll() loop clear the SCHED bit
|
|
|
|
Reported-by: Jakub Kicinski <kuba@kernel.org>
|
|
Fixes: 29863d41bb6e ("net: implement threaded-able napi poll loop support")
|
|
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
|
|
Reviewed-by: Eric Dumazet <edumazet@google.com>
|
|
Link: https://lore.kernel.org/r/883923fa22745a9589e8610962b7dc59df09fb1f.1617981844.git.pabeni@redhat.com
|
|
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
|
|
---
|
|
|
|
--- a/net/core/dev.c
|
|
+++ b/net/core/dev.c
|
|
@@ -6991,7 +6991,7 @@ static int napi_thread_wait(struct napi_
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
- while (!kthread_should_stop() && !napi_disable_pending(napi)) {
|
|
+ while (!kthread_should_stop()) {
|
|
/* Testing SCHED_THREADED bit here to make sure the current
|
|
* kthread owns this napi and could poll on this napi.
|
|
* Testing SCHED bit is not enough because SCHED bit might be
|
|
@@ -7009,6 +7009,7 @@ static int napi_thread_wait(struct napi_
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
+
|
|
return -1;
|
|
}
|
|
|