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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2cc32b18d1
Here, If ioremap_nocache will fail. It will return NULL. Kernel can run into a NULL-pointer dereference. This error check will avoid NULL pointer dereference. Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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* Serial Device Initialisation for Lasi/Asp/Wax/Dino
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*
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* (c) Copyright Matthew Wilcox <willy@debian.org> 2001-2002
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/serial_core.h>
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#include <linux/signal.h>
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#include <linux/types.h>
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#include <asm/hardware.h>
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#include <asm/parisc-device.h>
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#include <asm/io.h>
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#include "8250.h"
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static int __init serial_init_chip(struct parisc_device *dev)
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{
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struct uart_8250_port uart;
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unsigned long address;
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int err;
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#ifdef CONFIG_64BIT
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if (!dev->irq && (dev->id.sversion == 0xad))
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dev->irq = iosapic_serial_irq(dev);
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#endif
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if (!dev->irq) {
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/* We find some unattached serial ports by walking native
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* busses. These should be silently ignored. Otherwise,
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* what we have here is a missing parent device, so tell
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* the user what they're missing.
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*/
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if (parisc_parent(dev)->id.hw_type != HPHW_IOA)
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dev_info(&dev->dev,
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"Serial: device 0x%llx not configured.\n"
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"Enable support for Wax, Lasi, Asp or Dino.\n",
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(unsigned long long)dev->hpa.start);
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return -ENODEV;
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}
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address = dev->hpa.start;
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if (dev->id.sversion != 0x8d)
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address += 0x800;
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memset(&uart, 0, sizeof(uart));
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uart.port.iotype = UPIO_MEM;
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/* 7.272727MHz on Lasi. Assumed the same for Dino, Wax and Timi. */
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uart.port.uartclk = (dev->id.sversion != 0xad) ?
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7272727 : 1843200;
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uart.port.mapbase = address;
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uart.port.membase = ioremap_nocache(address, 16);
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if (!uart.port.membase) {
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dev_warn(&dev->dev, "Failed to map memory\n");
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return -ENOMEM;
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}
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uart.port.irq = dev->irq;
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uart.port.flags = UPF_BOOT_AUTOCONF;
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uart.port.dev = &dev->dev;
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err = serial8250_register_8250_port(&uart);
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if (err < 0) {
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dev_warn(&dev->dev,
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"serial8250_register_8250_port returned error %d\n",
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err);
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iounmap(uart.port.membase);
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return err;
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}
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return 0;
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}
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static struct parisc_device_id serial_tbl[] = {
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00075 },
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008c },
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008d },
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{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x000ad },
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{ 0 }
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};
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/* Hack. Some machines have SERIAL_0 attached to Lasi and SERIAL_1
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* attached to Dino. Unfortunately, Dino appears before Lasi in the device
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* tree. To ensure that ttyS0 == SERIAL_0, we register two drivers; one
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* which only knows about Lasi and then a second which will find all the
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* other serial ports. HPUX ignores this problem.
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*/
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static struct parisc_device_id lasi_tbl[] = {
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x03B, 0x0008C }, /* C1xx/C1xxL */
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x03C, 0x0008C }, /* B132L */
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x03D, 0x0008C }, /* B160L */
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x03E, 0x0008C }, /* B132L+ */
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x03F, 0x0008C }, /* B180L+ */
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x046, 0x0008C }, /* Rocky2 120 */
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x047, 0x0008C }, /* Rocky2 150 */
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x04E, 0x0008C }, /* Kiji L2 132 */
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{ HPHW_FIO, HVERSION_REV_ANY_ID, 0x056, 0x0008C }, /* Raven+ */
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{ 0 }
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};
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MODULE_DEVICE_TABLE(parisc, serial_tbl);
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static struct parisc_driver lasi_driver = {
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.name = "serial_1",
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.id_table = lasi_tbl,
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.probe = serial_init_chip,
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};
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static struct parisc_driver serial_driver = {
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.name = "serial",
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.id_table = serial_tbl,
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.probe = serial_init_chip,
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};
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static int __init probe_serial_gsc(void)
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{
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register_parisc_driver(&lasi_driver);
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register_parisc_driver(&serial_driver);
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return 0;
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}
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module_init(probe_serial_gsc);
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MODULE_LICENSE("GPL");
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