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DMI: allow omitting ident strings in DMI tables

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commit 75757507e0 upstream.

The purpose of dmi->ident is twofold - it may be used by DMI callback
functions when composing log messages; it is also used to determine
end of DMI table in dmi_check_system() and dmi_first_match(). However,
in case when callbacks are not interested in using ident at all it just
wastes memory. Let's make entries with empty first match slot serve as
end-of-table markers instead.

[needed for DMI table changes that need to be done by later patches - gkh]

Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dmitry Torokhov 2009-12-04 10:24:19 -08:00 committed by Greg Kroah-Hartman
parent 5172b4b0f1
commit 44d13be6ec
1 changed files with 12 additions and 3 deletions
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15
drivers/firmware/dmi_scan.c
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@ -429,7 +429,7 @@ static bool dmi_matches(const struct dmi_system_id *dmi)
for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
int s = dmi->matches[i].slot;
if (s == DMI_NONE)
continue;
break;
if (dmi_ident[s]
&& strstr(dmi_ident[s], dmi->matches[i].substr))
continue;
@ -439,6 +439,15 @@ static bool dmi_matches(const struct dmi_system_id *dmi)
return true;
}
/**
* dmi_is_end_of_table - check for end-of-table marker
* @dmi: pointer to the dmi_system_id structure to check
*/
static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
{
return dmi->matches[0].slot == DMI_NONE;
}
/**
* dmi_check_system - check system DMI data
* @list: array of dmi_system_id structures to match against
@ -457,7 +466,7 @@ int dmi_check_system(const struct dmi_system_id *list)
int count = 0;
const struct dmi_system_id *d;
for (d = list; d->ident; d++)
for (d = list; !dmi_is_end_of_table(d); d++)
if (dmi_matches(d)) {
count++;
if (d->callback && d->callback(d))
@ -484,7 +493,7 @@ const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
{
const struct dmi_system_id *d;
for (d = list; d->ident; d++)
for (d = list; !dmi_is_end_of_table(d); d++)
if (dmi_matches(d))
return d;