platform/x86/amd/hsmp: Change the error type

When file is opened in WRITE only mode, then GET messages are not allowed
and when file is opened in READ only mode, SET messages are not allowed.
In these scenerios, return error EPERM to userspace instead of EINVAL.

Signed-off-by: Suma Hegde <suma.hegde@amd.com>
Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
Link: https://lore.kernel.org/r/20241112120450.2407125-2-suma.hegde@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: sumachidanand

drivers/platform/x86/amd/hsmp/hsmp.c

@@ -262,15 +262,15 @@ long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 		 * Execute only set/configure commands
 		 */
 		if (hsmp_msg_desc_table[msg.msg_id].type != HSMP_SET)
-			return -EINVAL;
+			return -EPERM;
 		break;
 	case FMODE_READ:
 		/*
 		 * Device is opened in O_RDONLY mode
 		 * Execute only get/monitor commands
 		 */
 		if (hsmp_msg_desc_table[msg.msg_id].type != HSMP_GET)
-			return -EINVAL;
+			return -EPERM;
 		break;
 	case FMODE_READ | FMODE_WRITE:
 		/*
@@ -279,7 +279,7 @@ long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 		 */
 		break;
 	default:
-		return -EINVAL;
+		return -EPERM;
 	}
 
 	ret = hsmp_send_message(&msg);