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| author | Lv Zheng <lv.zheng@intel.com> | 2014-04-04 06:38:35 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-04-20 22:59:38 +0200 |
| commit | 55df23f0d620c5194ecbd3b68ecdb2798778bf93 (patch) | |
| tree | 22d088acce0e908142f0d8bef2323849f192677f /drivers/acpi | |
| parent | ACPICA: Tables: Fix the issues in handling virtual addressed tables. (diff) | |
| download | linux-55df23f0d620c5194ecbd3b68ecdb2798778bf93.tar.xz linux-55df23f0d620c5194ecbd3b68ecdb2798778bf93.zip | |
ACPICA: Tables: Fix multiple ACPI_FREE()s around acpi_tb_add_table().
Currently there are following issues in acpi_tb_add_table():
Following logic is currently correct:
1. When a table is allocated in acpi_ex_load_op(), if a reloading happens,
the allocated memory is freed by acpi_tb_add_table() and AE_OK is
returned to the caller to avoid the caller to free it again.
Following logic is currently incorrect:
1. When a table is allocated in acpi_ex_load_op() or by the
acpi_load_table() caller, if the table is already loaded, there will be
twice ACPI_FREE() called for the same pointer when acpi_tb_add_table()
returns AE_ALREADY_EXISTS.
This patch only fixes the above incorrect logic in acpi_tb_add_table():
1. Only invoke acpi_tb_delete_table() if AE_OK is going to be returned.
2. After doing so, we do not invoke ACPI_FREE() when returning AE_OK;
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
[rjw: Subject]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpica/exconfig.c | 2 | ||||
| -rw-r--r-- | drivers/acpi/acpica/tbinstal.c | 7 |
2 files changed, 2 insertions, 7 deletions
diff --git a/drivers/acpi/acpica/exconfig.c b/drivers/acpi/acpica/exconfig.c index 649a8efef0f5..11a014ca3935 100644 --- a/drivers/acpi/acpica/exconfig.c +++ b/drivers/acpi/acpica/exconfig.c @@ -504,7 +504,7 @@ acpi_ex_load_op(union acpi_operand_object *obj_desc, /* Delete allocated table buffer */ - acpi_tb_delete_table(&table_desc); + ACPI_FREE(table_desc.pointer); return_ACPI_STATUS(status); } diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c index 144076ac21f0..0040e19b6d14 100644 --- a/drivers/acpi/acpica/tbinstal.c +++ b/drivers/acpi/acpica/tbinstal.c @@ -203,12 +203,6 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index) * need to be unregistered when they are unloaded, and slots in the * root table list should be reused when empty. */ - - /* - * Table is already registered. - * We can delete the table that was passed as a parameter. - */ - acpi_tb_delete_table(table_desc); *table_index = i; if (acpi_gbl_root_table_list.tables[i]. @@ -221,6 +215,7 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index) } else { /* Table was unloaded, allow it to be reloaded */ + acpi_tb_delete_table(table_desc); table_desc->pointer = acpi_gbl_root_table_list.tables[i].pointer; table_desc->address = |