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ACPI: Verify device status after eject 

ACPI spec states that the OS evaluates _STA after calling _EJ0
in order to verify if eject was successful.  Added a check to
verify if the enabled bit of the status value is cleared after
_EJ0.

Note, the present bit is not checked since some FW implementations
do not clear the present bit until the hardware is physically
removed.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Toshi Kani 2013-03-13 19:29:26 +00:00 committed by Rafael J. Wysocki
parent ea6a4581ce
commit 882fd12e64
1 changed files with 17 additions and 1 deletions
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18
drivers/acpi/scan.c
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@ -127,6 +127,7 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
struct acpi_object_list arg_list;
union acpi_object arg;
acpi_status status;
unsigned long long sta;
/* If there is no handle, the device node has been unregistered. */
if (!handle) {
@ -164,10 +165,25 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
if (status == AE_NOT_FOUND) {
return -ENODEV;
} else {
acpi_handle_warn(handle, "Eject failed\n");
acpi_handle_warn(handle, "Eject failed (0x%x)\n",
status);
return -EIO;
}
}
/*
* Verify if eject was indeed successful. If not, log an error
* message. No need to call _OST since _EJ0 call was made OK.
*/
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status)) {
acpi_handle_warn(handle,
"Status check after eject failed (0x%x)\n", status);
} else if (sta & ACPI_STA_DEVICE_ENABLED) {
acpi_handle_warn(handle,
"Eject incomplete - status 0x%llx\n", sta);
}
return 0;
}