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EDAC, pnd2: Fix Apollo Lake DIMM detection

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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 <[email protected]>
Cc: Qiuxu Zhuo <[email protected]>
Cc: linux-edac <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Borislav Petkov <[email protected]>
This commit is contained in:
Tony Luck 2017-06-28 16:44:07 -07:00 • committed by Borislav Petkov
commit 164c29244d
1 changed files with 8 additions and 3 deletions
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11
drivers/edac/pnd2_edac.c
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@ -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)