[Xen-changelog] [xen stable-4.2] ACPI, APEI: Add apei_exec_run_optional

[patchbot@xxxxxxx]

commit f51b14d1f25c96fba290882f0a80fc7baf0fe28e
Author:     Huang Ying <ying.huang@xxxxxxxxx>
AuthorDate: Tue Apr 2 11:01:40 2013 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Apr 2 11:01:40 2013 +0200

    ACPI, APEI: Add apei_exec_run_optional
    
    Some actions in APEI ERST and EINJ tables are optional, for example,
    ACPI_EINJ_BEGIN_OPERATION action is used to do some preparation for
    error injection, and firmware may choose to do nothing here.  While
    some other actions are mandatory, for example, firmware must provide
    ACPI_EINJ_GET_ERROR_TYPE implementation.
    
    Original implementation treats all actions as optional (that is, can
    have no instructions), that may cause issue if firmware does not
    provide some mandatory actions.  To fix this, this patch adds
    apei_exec_run_optional, which should be used for optional actions.
    The original apei_exec_run should be used for mandatory actions.
    
    Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Tested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master changeset: 72af01bf6f7489e54ad59270222a29d3e8c501d1
    master date: 2013-03-22 12:46:25 +0100
---
 xen/drivers/acpi/apei/apei-base.c     |    7 ++++---
 xen/drivers/acpi/apei/apei-internal.h |   13 ++++++++++++-
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/xen/drivers/acpi/apei/apei-base.c 
b/xen/drivers/acpi/apei/apei-base.c
index 0a365b7..43f8f98 100644
--- a/xen/drivers/acpi/apei/apei-base.c
+++ b/xen/drivers/acpi/apei/apei-base.c
@@ -154,9 +154,10 @@ int apei_exec_noop(struct apei_exec_context *ctx,
  * Interpret the specified action. Go through whole action table,
  * execute all instructions belong to the action.
  */
-int apei_exec_run(struct apei_exec_context *ctx, u8 action)
+int __apei_exec_run(struct apei_exec_context *ctx, u8 action,
+                   bool_t optional)
 {
-       int rc;
+       int rc = -ENOENT;
        u32 i, ip;
        struct acpi_whea_header *entry;
        apei_exec_ins_func_t run;
@@ -195,7 +196,7 @@ rewind:
                        goto rewind;
        }
 
-       return 0;
+       return !optional && rc < 0 ? rc : 0;
 }
 
 typedef int (*apei_exec_entry_func_t)(struct apei_exec_context *ctx,
diff --git a/xen/drivers/acpi/apei/apei-internal.h 
b/xen/drivers/acpi/apei/apei-internal.h
index 77f31fb..b813d55 100644
--- a/xen/drivers/acpi/apei/apei-internal.h
+++ b/xen/drivers/acpi/apei/apei-internal.h
@@ -48,7 +48,18 @@ static inline u64 apei_exec_ctx_get_output(struct 
apei_exec_context *ctx)
        return ctx->value;
 }
 
-int apei_exec_run(struct apei_exec_context *ctx, u8 action);
+int __apei_exec_run(struct apei_exec_context *ctx, u8 action, bool_t optional);
+
+static inline int apei_exec_run(struct apei_exec_context *ctx, u8 action)
+{
+       return __apei_exec_run(ctx, action, 0);
+}
+
+/* It is optional whether the firmware provides the action */
+static inline int apei_exec_run_optional(struct apei_exec_context *ctx, u8 
action)
+{
+       return __apei_exec_run(ctx, action, 1);
+}
 
 /* Common instruction implementation */
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.2

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