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EDAC: Add helper which returns the loaded platform driver

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Only a single EDAC platform driver can be loaded. When ghes_edac is
enabled, an EDAC platform driver still attempts to register itself and
fails in edac_mc_add_mc().

Add edac_get_owner() so that EDAC platform drivers can check the owner
first.

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Suggested-by: Borislav Petkov <bp@alien8.de>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170823225447.15608-5-toshi.kani@hpe.com
[ Massage commit message. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Toshi Kani 2017-08-23 16:54:46 -06:00 committed by Borislav Petkov
parent 5deed6b6a4
commit 3877c7d1e2
2 changed files with 14 additions and 1 deletions
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7
drivers/edac/edac_mc.c
View File

@ -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,

8
drivers/edac/edac_mc.h
View File

@ -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.
*