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Subject[PATCH v3 4/5] EDAC: add edac_get_owner() to check MC owner
Date
Only a single edac driver can be enabled for EDAC MC.  When ghes_edac
is enabled, a regular edac driver for the CPU type / platform still
attempts to register itself and fails in edac_mc_add_mc().

Add edac_get_owner() so that regular edac drivers can check the owner
of EDAC MC without calling edac_mc_add_mc().

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Suggested-by: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
---
drivers/edac/edac_mc.c | 7 ++++++-
drivers/edac/edac_mc.h | 8 ++++++++
2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 4800721..48193f5 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -53,7 +53,7 @@ static LIST_HEAD(mc_devices);
* Used to lock EDAC MC to just one module, avoiding two drivers e. g.
* apei/ghes and i7core_edac to be used at the same time.
*/
-static void const *edac_mc_owner;
+static const char *edac_mc_owner;

static struct bus_type mc_bus[EDAC_MAX_MCS];

@@ -701,6 +701,11 @@ struct mem_ctl_info *edac_mc_find(int idx)
}
EXPORT_SYMBOL(edac_mc_find);

+const char *edac_get_owner(void)
+{
+ return edac_mc_owner;
+}
+EXPORT_SYMBOL_GPL(edac_get_owner);

/* FIXME - should a warning be printed if no error detection? correction? */
int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
index 5357800..4165e15 100644
--- a/drivers/edac/edac_mc.h
+++ b/drivers/edac/edac_mc.h
@@ -128,6 +128,14 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
unsigned sz_pvt);

/**
+ * edac_get_owner - Return the owner's mod_name of EDAC MC
+ *
+ * Returns:
+ * Pointer to mod_name string when EDAC MC is owned. NULL otherwise.
+ */
+extern const char *edac_get_owner(void);
+
+/*
* edac_mc_add_mc_with_groups() - Insert the @mci structure into the mci
* global list and create sysfs entries associated with @mci structure.
*
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