EDAC, sb_edac: Fix TAD presence check for sbridge_mci_bind_devs()

In commit

  7d375bffa524 ("sb_edac: Fix support for systems with two home agents per socket")

NUM_CHANNELS was changed to 8 and the channel space was renumerated to
handle EN, EP, and EX configurations.

The *_mci_bind_devs() functions - except for sbridge_mci_bind_devs() -
got a new device presence check in the form of saw_chan_mask. However,
sbridge_mci_bind_devs() still uses the NUM_CHANNELS for loop.

With the increase in NUM_CHANNELS, this loop fails at index 4 since
SB only has 4 TADs.  This results in the following error on SB machines:

  EDAC sbridge: Some needed devices are missing
  EDAC sbridge: Couldn't find mci handler
  EDAC sbridge: Couldn't find mci handle

This patch adapts the saw_chan_mask logic for sbridge_mci_bind_devs() as
well.

After this patch:

  EDAC MC0: Giving out device to module sbridge_edac.c controller Sandy Bridge Socket#0: DEV 0000:3f:0e.0 (POLLED)
  EDAC MC1: Giving out device to module sbridge_edac.c controller Sandy Bridge Socket#1: DEV 0000:7f:0e.0 (POLLED)

Signed-off-by: Seth Jennings <sjenning@redhat.com>
Acked-by: Aristeu Rozanski <aris@redhat.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org> # v4.2
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1438798561-10180-1-git-send-email-sjenning@redhat.com
Signed-off-by: Borislav Petkov <bp@suse.de>

diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index cf1268ddef0c058982ff45fb0bb0074a06d2f6b7..429309c62699ff9ea536a90b839dbb99b7305ecc 100644 (file)
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -1688,6 +1688,7 @@ static int sbridge_mci_bind_devs(struct mem_ctl_info *mci,
 {
        struct sbridge_pvt *pvt = mci->pvt_info;
        struct pci_dev *pdev;
+       u8 saw_chan_mask = 0;
        int i;
 
        for (i = 0; i < sbridge_dev->n_devs; i++) {
@@ -1721,6 +1722,7 @@ static int sbridge_mci_bind_devs(struct mem_ctl_info *mci,
                {
                        int id = pdev->device - PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0;
                        pvt->pci_tad[id] = pdev;
+                       saw_chan_mask |= 1 << id;
                }
                        break;
                case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_DDRIO:
@@ -1741,10 +1743,8 @@ static int sbridge_mci_bind_devs(struct mem_ctl_info *mci,
            !pvt-> pci_tad || !pvt->pci_ras  || !pvt->pci_ta)
                goto enodev;
 
-       for (i = 0; i < NUM_CHANNELS; i++) {
-               if (!pvt->pci_tad[i])
-                       goto enodev;
-       }
+       if (saw_chan_mask != 0x0f)
+               goto enodev;
        return 0;
 
 enodev: