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Subject[PATCH] sb_edac: Fix detection on SNB machines
Date
From: Borislav Petkov <bp@suse.de>

Commit 50d1bb93672f ("sb_edac: add support for Haswell based systems")
broke the driver on my SNB box with PCI ID 0x3ca0:

3f:0e.0 System peripheral: Intel Corporation Xeon E5/Core i7 Processor Home Agent (rev 07)
00: 86 80 a0 3c 00 00 00 00 07 00 80 08 00 00 80 00
...

because its probe routine gets handed in pdev->device: 0x3ca0 but we're
matching for 0x3ca8, i.e. PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA and the
probing fails.

Adding 0x3ca0 fixes the issue and driver loads successfully again:

[ 2449.013120] EDAC DEBUG: sbridge_init:
[ 2449.017029] EDAC sbridge: Seeking for: PCI ID 8086:3ca0
[ 2449.022368] EDAC DEBUG: sbridge_get_onedevice: Detected 8086:3ca0
[ 2449.028498] EDAC sbridge: Seeking for: PCI ID 8086:3ca0
[ 2449.033768] EDAC sbridge: Seeking for: PCI ID 8086:3ca8
[ 2449.039028] EDAC DEBUG: sbridge_get_onedevice: Detected 8086:3ca8
[ 2449.045155] EDAC sbridge: Seeking for: PCI ID 8086:3ca8
...

Add a debug printk while at it to be able to catch the failure in the
future and dump driver version on successful load.

Cc: Tony Luck <tony.luck@intel.com>
Cc: Aristeu Rozanski <aris@redhat.com>
Cc: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
---
drivers/edac/sb_edac.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 63aa6730e89e..2e1c03a64751 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -2448,6 +2448,7 @@ static int sbridge_probe(struct pci_dev *pdev, const struct pci_device_id *id)
type = IVY_BRIDGE;
break;
case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA:
+ case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0:
rc = sbridge_get_all_devices(&num_mc, pci_dev_descr_sbridge_table);
type = SANDY_BRIDGE;
break;
@@ -2460,8 +2461,11 @@ static int sbridge_probe(struct pci_dev *pdev, const struct pci_device_id *id)
type = BROADWELL;
break;
}
- if (unlikely(rc < 0))
+ if (unlikely(rc < 0)) {
+ edac_dbg(0, "couldn't get all devices for 0x%x\n", pdev->device);
goto fail0;
+ }
+
mc = 0;

list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
@@ -2474,7 +2478,7 @@ static int sbridge_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto fail1;
}

- sbridge_printk(KERN_INFO, "Driver loaded.\n");
+ sbridge_printk(KERN_INFO, "%s\n", SBRIDGE_REVISION);

mutex_unlock(&sbridge_edac_lock);
return 0;
--
2.2.0.33.gc18b867


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