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Subject[RFC PATCH v3 10/10] EDAC/amd64: Check for memory before fully initializing an instance
Date
From: Yazen Ghannam <yazen.ghannam@amd.com>

Return early before checking for ECC if the node does not have any
populated memory.

Free any cached hardware data before returning. Also, return 0 in this
case since this is not a failure. Other nodes may have memory and the
module should attempt to load an instance for them.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
drivers/edac/amd64_edac.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index c1cb0234f085..7230ed4ff665 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3505,6 +3505,23 @@ static int init_one_instance(struct amd64_pvt *pvt,
return ret;
}

+static bool instance_has_memory(struct amd64_pvt *pvt)
+{
+ bool cs_enabled = false;
+ int num_channels = 2;
+ int cs = 0, dct = 0;
+
+ if (pvt->umc)
+ num_channels = num_umcs;
+
+ for (dct = 0; dct < num_channels; dct++) {
+ for_each_chip_select(cs, dct, pvt)
+ cs_enabled |= csrow_enabled(cs, dct, pvt);
+ }
+
+ return cs_enabled;
+}
+
static int probe_one_instance(unsigned int nid)
{
struct pci_dev *F3 = node_to_amd_nb(nid)->misc;
@@ -3535,6 +3552,10 @@ static int probe_one_instance(unsigned int nid)
if (ret < 0)
goto err_enable;

+ ret = 0;
+ if (!instance_has_memory(pvt))
+ goto err_enable;
+
if (!ecc_enabled(pvt)) {
ret = 0;

--
2.17.1
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