linux-kernel - [v3,1/1] EDAC: (pnd2) Change the return value of function apl_check_ecc_active() & dnv_check_ecc_active() when installed the non-ECC memory device.

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Date:   Wed, 1 Apr 2020 11:05:55 +0800
From:   "she90122 ." <she90122@...il.com>
To:     she90122 <she90122@...il.com>
Cc:     Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        James Morse <james.morse@....com>,
        Robert Richter <rrichter@...vell.com>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Amy.Shih" <Amy.Shih@...antech.com.tw>,
        "Oakley.Ding" <Oakley.Ding@...antech.com.tw>
Subject: [v3,1/1] EDAC: (pnd2) Change the return value of function
 apl_check_ecc_active() & dnv_check_ecc_active() when installed the non-ECC
 memory device.

From: Amy Shih <amy.shih@...antech.com.tw>

Set function apl_check_ecc_active() &
dnv_check_ecc_active() to return -ENXIO when installed the non-ECC
memory device. And print the message in pnd2_init() accordingly.

Signed-off-by: Amy Shih <amy.shih@...antech.com.tw>
---
Changes in v3:
- Change the return value of function check_ecc when installed the
non-ECC memory device.
Changes in v2:
- Remove the word "error" from output message.
---
 drivers/edac/pnd2_edac.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c index
933f772..27172d7 100644
--- a/drivers/edac/pnd2_edac.c
+++ b/drivers/edac/pnd2_edac.c
@@ -1089,7 +1089,7 @@ static int apl_check_ecc_active(void)
  for (i = 0; i < APL_NUM_CHANNELS; i++)
  if (chan_mask & BIT(i))
  ret += check_channel(i);
- return ret ? -EINVAL : 0;
+ return ret ? -ENXIO : 0;
 }

 #define DIMMS_PRESENT(d) ((d)->rken0 + (d)->rken1 + (d)->rken2 +
(d)->rken3) @@ -1111,7 +1111,7 @@ static int
dnv_check_ecc_active(void)

  for (i = 0; i < DNV_NUM_CHANNELS; i++)
  ret += check_unit(i);
- return ret ? -EINVAL : 0;
+ return ret ? -ENXIO : 0;
 }

 static int get_memory_error_data(struct mem_ctl_info *mci, u64 addr,
@@ -1572,7 +1572,12 @@ static int __init pnd2_init(void)

  rc = pnd2_probe();
  if (rc < 0) {
- pnd2_printk(KERN_ERR, "Failed to register device with error %d.\n", rc);
+ if (rc == -ENXIO)
+ pnd2_printk(KERN_INFO, "System is not using ECC memory\n");
+ else
+ pnd2_printk(KERN_ERR,
+     "Failed to register device with error %d.\n",
+     rc);
  return rc;
  }

--
1.8.3.1