From: "Zhiguang Liu" <zhiguang.liu@intel.com>
To: devel@edk2.groups.io
Cc: Zhiguang Liu <zhiguang.liu@intel.com>,
Liming Gao <gaoliming@byosoft.com.cn>,
Jiaxin Wu <jiaxin.wu@intel.com>, Ray Ni <ray.ni@intel.com>,
Laszlo Ersek <lersek@redhat.com>,
Ard Biesheuvel <ardb+tianocore@kernel.org>,
Sami Mujawar <sami.mujawar@arm.com>
Subject: [edk2-devel] [PATCH v3 3/4] StandaloneMmPkg: Support to unregister MMI handler inside MMI handler
Date: Fri, 1 Mar 2024 11:01:32 +0800 [thread overview]
Message-ID: <20240301030133.628-4-zhiguang.liu@intel.com> (raw)
In-Reply-To: <20240301030133.628-1-zhiguang.liu@intel.com>
To support unregister MMI handler inside MMI handler itself,
get next node before MMI handler is executed, since LIST_ENTRY that
Link points to may be freed if unregister MMI handler in MMI handler
itself.
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
---
StandaloneMmPkg/Core/Mmi.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/StandaloneMmPkg/Core/Mmi.c b/StandaloneMmPkg/Core/Mmi.c
index 0de6fd17fc..c1a1d76e85 100644
--- a/StandaloneMmPkg/Core/Mmi.c
+++ b/StandaloneMmPkg/Core/Mmi.c
@@ -154,9 +154,14 @@ MmiManage (
Head = &MmiEntry->MmiHandlers;
}
- for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {
+ for (Link = Head->ForwardLink; Link != Head;) {
MmiHandler = CR (Link, MMI_HANDLER, Link, MMI_HANDLER_SIGNATURE);
-
+ //
+ // To support unregister MMI handler inside MMI handler itself,
+ // get next node before handler is executed, since LIST_ENTRY that
+ // Link points to may be freed if unregister MMI handler.
+ //
+ Link = Link->ForwardLink;
Status = MmiHandler->Handler (
(EFI_HANDLE)MmiHandler,
Context,
--
2.31.1.windows.1
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next prev parent reply other threads:[~2024-03-01 3:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-01 3:01 [edk2-devel] [PATCH v3 0/4] Support to unregister SMI handler inside SMI handler Zhiguang Liu
2024-03-01 3:01 ` [edk2-devel] [PATCH v3 1/4] MdeModulePkg/SMM: " Zhiguang Liu
2024-03-01 3:01 ` [edk2-devel] [PATCH v3 2/4] MdeModulePkg/SMM: Disallow unregister SMI handler in other " Zhiguang Liu
2024-03-01 3:08 ` Ni, Ray
2024-03-01 12:17 ` Laszlo Ersek
2024-03-01 3:01 ` Zhiguang Liu [this message]
2024-03-01 3:01 ` [edk2-devel] [PATCH v3 4/4] StandaloneMmPkg: Disallow unregister MMI handler in other MMI handler Zhiguang Liu
2024-03-01 3:08 ` Ni, Ray
2024-03-01 12:18 ` Laszlo Ersek
2024-03-01 18:58 ` [edk2-devel] [PATCH v3 0/4] Support to unregister SMI handler inside SMI handler Laszlo Ersek
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