[Issue]
A format of variable name has been updated to type, id, count and ctime
to support holding multiple logs.
Format of current variable name
dump-type0-1-2-12345678
type:0
id:1
count:2
ctime:12345678
On the other hand, if an old variable name before being updated
remains, users can't erase it via /dev/pstore.
Format of old variable name
dump-type0-1-12345678
type:0
id:1
ctime:12345678
[Solution]
This patch adds a format check for the old variable name in a erase callback to make it erasable.
Signed-off-by: Seiji Aguchi <seiji.aguchi@xxxxxxx>
---
drivers/firmware/efivars.c | 14 ++++++++++++--
1 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index dd228d5..b1cd028 100644
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -777,6 +777,8 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
struct efivars *efivars = psi->data;
struct efivar_entry *entry, *found = NULL;
int i;
+ unsigned int type_old, part_old;
+ unsigned long time_old;
sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count,
time.tv_sec);
@@ -796,8 +798,16 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
if (efi_guidcmp(entry->var.VendorGuid, vendor))
continue;
if (utf16_strncmp(entry->var.VariableName, efi_name,
- utf16_strlen(efi_name)))
- continue;
+ utf16_strlen(efi_name))) {
+ /*
+ * Check if an old format,
+ * which doesn't support holding
+ * multiple logs, remains.
+ */
+ if (sscanf(name, "dump-type%u-%u-%lu",
+ &type_old, &part_old, &time_old) != 3)
+ continue;
+ }
/* found */
found = entry;
-- 1.7.1
--
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