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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-03-02 11:25:13 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-03-02 11:25:13 +0100
commite3cfabcd736a00c61c3a5ee322186b30c642993a (patch)
treebbda6ddb147ef09d247ba05790a1a3258ca07591 /drivers/acpi/ec.c
parent7247f0c24c17a46a9732a801e57b627fb6bbf294 (diff)
downloadlinux-e3cfabcd736a00c61c3a5ee322186b30c642993a.tar.bz2
ACPI: EC: Simplify acpi_ec_add()
First, notice that if the device ID in acpi_ec_add() is equal to ACPI_ECDT_HID, boot_ec_is_ecdt must be set, because this means that the device object passed to acpi_ec_add() comes from acpi_ec_ecdt_start() which fails if boot_ec_is_ecdt is unset. Accordingly, boot_ec_is_ecdt need not be set again in that case, so drop that redundant update of it from the code. Next, ec->handle must be a valid ACPI handle right before returning 0 from acpi_ec_add(), because it either is the handle of the device object passed to that function, or it is the boot EC handle coming from acpi_ec_ecdt_start() which fails if it cannot find a valid handle for the boot EC. Moreover, the object with that handle is regarded as a valid representation of the EC in all cases, so there is no reason to avoid the _DEP list update walk if that handle is the boot EC handle. Accordingly, drop the dep_update local variable from acpi_ec_add() and call acpi_walk_dep_device_list() for ec->handle unconditionally before returning 0 from it. Finally, the ec local variable in acpi_ec_add() need not be initialized to NULL and the status local variable declaration can be moved to the block in which it is used, so change the code in accordance with these observations. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r--drivers/acpi/ec.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 6f501d552e6e..116163add41b 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1605,19 +1605,18 @@ static bool acpi_ec_ecdt_get_handle(acpi_handle *phandle)
static int acpi_ec_add(struct acpi_device *device)
{
- struct acpi_ec *ec = NULL;
- bool dep_update = true;
- acpi_status status;
+ struct acpi_ec *ec;
int ret;
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
if (!strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) {
- boot_ec_is_ecdt = true;
+ /* Fast path: this device corresponds to the boot EC. */
ec = boot_ec;
- dep_update = false;
} else {
+ acpi_status status;
+
ec = acpi_ec_alloc();
if (!ec)
return -ENOMEM;
@@ -1660,10 +1659,9 @@ static int acpi_ec_add(struct acpi_device *device)
ret = !!request_region(ec->command_addr, 1, "EC cmd");
WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);
- if (dep_update) {
- /* Reprobe devices depending on the EC */
- acpi_walk_dep_device_list(ec->handle);
- }
+ /* Reprobe devices depending on the EC */
+ acpi_walk_dep_device_list(ec->handle);
+
acpi_handle_debug(ec->handle, "enumerated.\n");
return 0;