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author | Ingo Molnar <mingo@elte.hu> | 2008-09-18 12:50:18 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-09-18 12:52:29 +0200 |
commit | 9a22b6e76ba75fa0f3963cdec7829156d00a7173 (patch) | |
tree | a097e39127d0b2b7ad3adf1a1a8b2d6f47b67366 /drivers | |
parent | 8308c54d7e312f7a03e2ce2057d0837e6fe3843f (diff) | |
download | linux-9a22b6e76ba75fa0f3963cdec7829156d00a7173.tar.gz linux-9a22b6e76ba75fa0f3963cdec7829156d00a7173.tar.bz2 linux-9a22b6e76ba75fa0f3963cdec7829156d00a7173.zip |
dmi scan: warn about too early calls to dmi_check_system()
It happened to me recently that i added a dmi_check_system() quirk
in a too early codepath, and it was silently ignored because all the
DMI tables and strings were still empty.
As this situation is clearly a programming error / kernel bug,
warn when it happens, instead of silently ignoring quirks.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/firmware/dmi_scan.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c index 455575be3560..3e526b6d00cb 100644 --- a/drivers/firmware/dmi_scan.c +++ b/drivers/firmware/dmi_scan.c @@ -15,6 +15,11 @@ */ static char dmi_empty_string[] = " "; +/* + * Catch too early calls to dmi_check_system(): + */ +static int dmi_initialized; + static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s) { const u8 *bp = ((u8 *) dm) + dm->length; @@ -366,7 +371,7 @@ void __init dmi_scan_machine(void) if (efi_enabled) { if (efi.smbios == EFI_INVALID_TABLE_ADDR) - goto out; + goto error; /* This is called as a core_initcall() because it isn't * needed during early boot. This also means we can @@ -374,13 +379,13 @@ void __init dmi_scan_machine(void) */ p = dmi_ioremap(efi.smbios, 32); if (p == NULL) - goto out; + goto error; rc = dmi_present(p + 0x10); /* offset of _DMI_ string */ dmi_iounmap(p, 32); if (!rc) { dmi_available = 1; - return; + goto out; } } else { @@ -391,19 +396,22 @@ void __init dmi_scan_machine(void) */ p = dmi_ioremap(0xF0000, 0x10000); if (p == NULL) - goto out; + goto error; for (q = p; q < p + 0x10000; q += 16) { rc = dmi_present(q); if (!rc) { dmi_available = 1; dmi_iounmap(p, 0x10000); - return; + goto out; } } dmi_iounmap(p, 0x10000); } - out: printk(KERN_INFO "DMI not present or invalid.\n"); + error: + printk(KERN_INFO "DMI not present or invalid.\n"); + out: + dmi_initialized = 1; } /** @@ -424,6 +432,8 @@ int dmi_check_system(const struct dmi_system_id *list) int i, count = 0; const struct dmi_system_id *d = list; + WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n"); + while (d->ident) { for (i = 0; i < ARRAY_SIZE(d->matches); i++) { int s = d->matches[i].slot; |