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[efi] Raise TPL within EFI_DRIVER_BINDING_PROTOCOL entry points 

Debugged-by: Rob Taglang <rob@privatemachines.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/69/merge
Michael Brown 2018-03-14 23:55:28 +00:00
parent d8c500b794
commit 10d083ffa9
1 changed files with 19 additions and 0 deletions
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19
src/interface/efi/efi_driver.c
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@ -95,7 +95,9 @@ struct efi_device * efidev_parent ( struct device *dev ) {
static EFI_STATUS EFIAPI
efi_driver_supported ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
EFI_HANDLE device, EFI_DEVICE_PATH_PROTOCOL *child ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct efi_driver *efidrv;
EFI_TPL saved_tpl;
int rc;
DBGCP ( device, "EFIDRV %s DRIVER_SUPPORTED",
@ -111,17 +113,22 @@ efi_driver_supported ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
return EFI_ALREADY_STARTED;
}
/* Raise TPL */
saved_tpl = bs->RaiseTPL ( TPL_CALLBACK );
/* Look for a driver claiming to support this device */
for_each_table_entry ( efidrv, EFI_DRIVERS ) {
if ( ( rc = efidrv->supported ( device ) ) == 0 ) {
DBGC ( device, "EFIDRV %s has driver \"%s\"\n",
efi_handle_name ( device ), efidrv->name );
bs->RestoreTPL ( saved_tpl );
return 0;
}
}
DBGCP ( device, "EFIDRV %s has no driver\n",
efi_handle_name ( device ) );
bs->RestoreTPL ( saved_tpl );
return EFI_UNSUPPORTED;
}
@ -145,6 +152,7 @@ efi_driver_start ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
} path;
EFI_DEVICE_PATH_PROTOCOL *path_end;
size_t path_len;
EFI_TPL saved_tpl;
EFI_STATUS efirc;
int rc;
@ -162,6 +170,9 @@ efi_driver_start ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
goto err_already_started;
}
/* Raise TPL */
saved_tpl = bs->RaiseTPL ( TPL_CALLBACK );
/* Do nothing if we are currently disconnecting drivers */
if ( efi_driver_disconnecting ) {
DBGC ( device, "EFIDRV %s refusing to start during "
@ -215,6 +226,7 @@ efi_driver_start ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
DBGC ( device, "EFIDRV %s using driver \"%s\"\n",
efi_handle_name ( device ),
efidev->driver->name );
bs->RestoreTPL ( saved_tpl );
return 0;
}
DBGC ( device, "EFIDRV %s could not start driver \"%s\": %s\n",
@ -232,6 +244,7 @@ efi_driver_start ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
}
err_open_path:
err_disconnecting:
bs->RestoreTPL ( saved_tpl );
err_already_started:
return efirc;
}
@ -250,8 +263,10 @@ static EFI_STATUS EFIAPI
efi_driver_stop ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
EFI_HANDLE device, UINTN num_children,
EFI_HANDLE *children ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
struct efi_driver *efidrv;
struct efi_device *efidev;
EFI_TPL saved_tpl;
UINTN i;
DBGC ( device, "EFIDRV %s DRIVER_STOP", efi_handle_name ( device ) );
@ -269,6 +284,9 @@ efi_driver_stop ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
return EFI_DEVICE_ERROR;
}
/* Raise TPL */
saved_tpl = bs->RaiseTPL ( TPL_CALLBACK );
/* Stop this device */
efidrv = efidev->driver;
assert ( efidrv != NULL );
@ -276,6 +294,7 @@ efi_driver_stop ( EFI_DRIVER_BINDING_PROTOCOL *driver __unused,
list_del ( &efidev->dev.siblings );
free ( efidev );
bs->RestoreTPL ( saved_tpl );
return 0;
}