enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/drivers/usb/serial/kobil_sct.c
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@@ -499,7 +499,7 @@
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 		break;
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 	default:
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 		speed = 9600;
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-		/* fall through */
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+		fallthrough;
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 	case 9600:
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 		urb_val = SUSBCR_SBR_9600;
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 		break;
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@@ -526,6 +526,10 @@
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 		  0,
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 		  KOBIL_TIMEOUT
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 		);
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+	if (result) {
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+		dev_err(&port->dev, "failed to update line settings: %d\n",
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+				result);
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+	}
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 }
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 static int kobil_ioctl(struct tty_struct *tty,