Commit 4e8ca6ee authored by Kevin Hao's avatar Kevin Hao Committed by Rob Herring
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Revert "OF: base: match each node compatible against all given matches first"

This reverts commit 10535314

.
Stephen Chivers reported this is broken as we will get a match
entry '.type = "serial"' instead of the '.compatible = "ns16550"'
in the following scenario:
	serial0: serial@4500 {
		compatible = "fsl,ns16550", "ns16550";
	}

	struct of_device_id of_platform_serial_table[] = {
		{ .compatible = "ns8250",   .data = (void *)PORT_8250, },
		{ .compatible = "ns16450",  .data = (void *)PORT_16450, },
		{ .compatible = "ns16550a", .data = (void *)PORT_16550A, },
		{ .compatible = "ns16550",  .data = (void *)PORT_16550, },
		{ .compatible = "ns16750",  .data = (void *)PORT_16750, },
		{ .compatible = "ns16850",  .data = (void *)PORT_16850, },
		...
		{ .type = "serial",         .data = (void *)PORT_UNKNOWN, },
		{ /* end of list */ },
	};

So just revert this patch, we will use another implementation to find
the best compatible match in a follow-on patch.
Reported-by: default avatarStephen N Chivers <schivers@csc.com.au>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: default avatarKevin Hao <haokexin@gmail.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent 860a445c
......@@ -734,42 +734,24 @@ static
const struct of_device_id *__of_match_node(const struct of_device_id *matches,
const struct device_node *node)
{
const char *cp;
int cplen, l;
if (!matches)
return NULL;
cp = __of_get_property(node, "compatible", &cplen);
do {
const struct of_device_id *m = matches;
/* Check against matches with current compatible string */
while (m->name[0] || m->type[0] || m->compatible[0]) {
int match = 1;
if (m->name[0])
match &= node->name
&& !strcmp(m->name, node->name);
if (m->type[0])
match &= node->type
&& !strcmp(m->type, node->type);
if (m->compatible[0])
match &= cp
&& !of_compat_cmp(m->compatible, cp,
strlen(m->compatible));
if (match)
return m;
m++;
}
/* Get node's next compatible string */
if (cp) {
l = strlen(cp) + 1;
cp += l;
cplen -= l;
}
} while (cp && (cplen > 0));
while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
int match = 1;
if (matches->name[0])
match &= node->name
&& !strcmp(matches->name, node->name);
if (matches->type[0])
match &= node->type
&& !strcmp(matches->type, node->type);
if (matches->compatible[0])
match &= __of_device_is_compatible(node,
matches->compatible);
if (match)
return matches;
matches++;
}
return NULL;
}
......@@ -778,10 +760,7 @@ const struct of_device_id *__of_match_node(const struct of_device_id *matches,
* @matches: array of of device match structures to search in
* @node: the of device structure to match against
*
* Low level utility function used by device matching. Matching order
* is to compare each of the node's compatibles with all given matches
* first. This implies node's compatible is sorted from specific to
* generic while matches can be in any order.
* Low level utility function used by device matching.
*/
const struct of_device_id *of_match_node(const struct of_device_id *matches,
const struct device_node *node)
......
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