This is a note to let you know that I've just added the patch titled
platform/x86/intel/ifs: release cpus_read_lock()
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
platform-x86-intel-ifs-release-cpus_read_lock.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2545deba314eec91dc5ca1a954fe97f91ef1cf07 Mon Sep 17 00:00:00 2001
From: Jithu Joseph <jithu.joseph@xxxxxxxxx>
Date: Wed, 27 Sep 2023 11:48:24 -0700
Subject: platform/x86/intel/ifs: release cpus_read_lock()
From: Jithu Joseph <jithu.joseph@xxxxxxxxx>
commit 2545deba314eec91dc5ca1a954fe97f91ef1cf07 upstream.
Couple of error paths in do_core_test() was returning directly without
doing a necessary cpus_read_unlock().
Following lockdep warning was observed when exercising these scenarios
with PROVE_RAW_LOCK_NESTING enabled:
[ 139.304775] ================================================
[ 139.311185] WARNING: lock held when returning to user space!
[ 139.317593] 6.6.0-rc2ifs01+ #11 Tainted: G S W I
[ 139.324499] ------------------------------------------------
[ 139.330908] bash/11476 is leaving the kernel with locks still held!
[ 139.338000] 1 lock held by bash/11476:
[ 139.342262] #0: ffffffffaa26c930 (cpu_hotplug_lock){++++}-{0:0}, at:
do_core_test+0x35/0x1c0 [intel_ifs]
Fix the flow so that all scenarios release the lock prior to returning
from the function.
Fixes: 5210fb4e1880 ("platform/x86/intel/ifs: Sysfs interface for Array BIST")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jithu Joseph <jithu.joseph@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230927184824.2566086-1-jithu.joseph@xxxxxxxxx
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/platform/x86/intel/ifs/runtest.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/x86/intel/ifs/runtest.c b/drivers/platform/x86/intel/ifs/runtest.c
index 1061eb7ec399..43c864add778 100644
--- a/drivers/platform/x86/intel/ifs/runtest.c
+++ b/drivers/platform/x86/intel/ifs/runtest.c
@@ -331,14 +331,15 @@ int do_core_test(int cpu, struct device *dev)
switch (test->test_num) {
case IFS_TYPE_SAF:
if (!ifsd->loaded)
- return -EPERM;
- ifs_test_core(cpu, dev);
+ ret = -EPERM;
+ else
+ ifs_test_core(cpu, dev);
break;
case IFS_TYPE_ARRAY_BIST:
ifs_array_test_core(cpu, dev);
break;
default:
- return -EINVAL;
+ ret = -EINVAL;
}
out:
cpus_read_unlock();
--
2.42.0
Patches currently in stable-queue which might be from jithu.joseph@xxxxxxxxx are
queue-6.5/platform-x86-intel-ifs-release-cpus_read_lock.patch
