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PCI: rpaphp: Correctly match ibm, my-drc-index to drc-name when using drc-info

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The newer ibm,drc-info property is a condensed description of the old
ibm,drc-* properties (ie. names, types, indexes, and power-domains).
When matching a drc-index to a drc-name we need to verify that the
index is within the start and last drc-index range and map it to a
drc-name using the drc-name-prefix and logical index.

Fix the mapping by checking that the index is within the range of the
current drc-info entry, and build the name from the drc-name-prefix
concatenated with the starting drc-name-suffix value and the sequential
index obtained by subtracting ibm,my-drc-index from this entries
drc-start-index.

Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1573449697-5448-10-git-send-email-tyreld@linux.ibm.com
This commit is contained in:
Tyrel Datwyler 2019-11-10 23:21:36 -06:00 committed by Michael Ellerman
parent 0737686778
commit 4f9f2d3d7a
1 changed files with 3 additions and 2 deletions
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5
drivers/pci/hotplug/rpaphp_core.c
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@ -248,9 +248,10 @@ static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name,
/* Should now know end of current entry */
/* Found it */
if (my_index <= drc.last_drc_index) {
if (my_index >= drc.drc_index_start && my_index <= drc.last_drc_index) {
int index = my_index - drc.drc_index_start;
sprintf(cell_drc_name, "%s%d", drc.drc_name_prefix,
my_index);
drc.drc_name_suffix_start + index);
break;
}
}