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| author | Tony Luck <tony.luck@intel.com> | 2017-06-28 16:44:07 -0700 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2017-06-29 10:37:50 +0200 |
| commit | 164c29244d4beb9a105102c42821f4925e4a0c7a (patch) | |
| tree | 8612f51b61bcb4f3d4a8f629393660064a230007 /drivers/edac/pnd2_edac.c | |
| parent | a8c8261425649da58bdf08221570e5335ad33a31 (diff) | |
| download | linux-164c29244d4beb9a105102c42821f4925e4a0c7a.tar.gz linux-164c29244d4beb9a105102c42821f4925e4a0c7a.tar.bz2 linux-164c29244d4beb9a105102c42821f4925e4a0c7a.zip | |
EDAC, pnd2: Fix Apollo Lake DIMM detection
Non-existent or empty DIMM slots result in error return from
RD_REGP(). But we shouldn't give up on failure.
So long as we find at least one DIMM we can continue.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170628234407.21521-1-tony.luck@intel.com
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'drivers/edac/pnd2_edac.c')
| -rw-r--r-- | drivers/edac/pnd2_edac.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c index 407f239553f4..8e599490f6de 100644 --- a/drivers/edac/pnd2_edac.c +++ b/drivers/edac/pnd2_edac.c @@ -424,16 +424,21 @@ static void dnv_mk_region(char *name, struct region *rp, void *asym) static int apl_get_registers(void) { + int ret = -ENODEV; int i; if (RD_REG(&asym_2way, b_cr_asym_2way_mem_region_mchbar)) return -ENODEV; + /* + * RD_REGP() will fail for unpopulated or non-existent + * DIMM slots. Return success if we find at least one DIMM. + */ for (i = 0; i < APL_NUM_CHANNELS; i++) - if (RD_REGP(&drp0[i], d_cr_drp0, apl_dports[i])) - return -ENODEV; + if (!RD_REGP(&drp0[i], d_cr_drp0, apl_dports[i])) + ret = 0; - return 0; + return ret; } static int dnv_get_registers(void) |