After attempting to quickly retrieve known errors the kernel proceeds to
kick off a long running ARS. Add a module option to disable this
behavior at initialization time, or at new region discovery time.
Otherwise, ARS can be started manually regardless of the state of this
setting.

Co-developed-by: Dave Jiang <dave.ji...@intel.com>
Signed-off-by: Dave Jiang <dave.ji...@intel.com>
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
 drivers/acpi/nfit/core.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 2532294bbd68..7f3c70fde9a8 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -49,6 +49,10 @@ module_param(default_dsm_family, int, S_IRUGO);
 MODULE_PARM_DESC(default_dsm_family,
                "Try this DSM type first when identifying NVDIMM family");
 
+static bool no_init_ars;
+module_param(no_init_ars, bool, 0644);
+MODULE_PARM_DESC(no_init_ars, "Skip ARS run at nfit init time");
+
 LIST_HEAD(acpi_descs);
 DEFINE_MUTEX(acpi_desc_lock);
 
@@ -2816,6 +2820,9 @@ static int ars_register(struct acpi_nfit_desc *acpi_desc, 
struct nfit_spa *nfit_
 {
        int rc = *query_rc;
 
+       if (no_init_ars)
+               return acpi_nfit_register_region(acpi_desc, nfit_spa);
+
        set_bit(ARS_REQ, &nfit_spa->ars_state);
        set_bit(ARS_SHORT, &nfit_spa->ars_state);
 

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