add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/tty/serial/sunsab.c
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@@ -40,10 +40,6 @@
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 #include <asm/prom.h>
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 #include <asm/setup.h>
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-#if defined(CONFIG_SERIAL_SUNSAB_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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-#define SUPPORT_SYSRQ
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-#endif
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-
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 #include <linux/serial_core.h>
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 #include <linux/sunserialcore.h>
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@@ -890,7 +886,7 @@
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 	 * though...
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 	 */
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 	if (up->port.type != PORT_SUNSAB)
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-		return -1;
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+		return -EINVAL;
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 	printk("Console: ttyS%d (SAB82532)\n",
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 	       (sunsab_reg.minor - 64) + con->index);
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@@ -985,6 +981,7 @@
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 	up->port.fifosize = SAB82532_XMIT_FIFO_SIZE;
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 	up->port.iotype = UPIO_MEM;
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+	up->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_SUNSAB_CONSOLE);
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 	writeb(SAB82532_IPC_IC_ACT_LOW, &up->regs->w.ipc);
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@@ -1140,7 +1137,13 @@
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 		}
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 	}
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-	return platform_driver_register(&sab_driver);
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+	err = platform_driver_register(&sab_driver);
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+	if (err) {
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+		kfree(sunsab_ports);
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+		sunsab_ports = NULL;
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+	}
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+
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+	return err;
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 }
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 static void __exit sunsab_exit(void)