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DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Flag: NO X-Spam-Level: This driver has a number of issues (accesses arbitrary I/O ports without identifying the hardware, doesn't document what hardware it supports, suspiciously inconsistent locking model, doesn't implement WDIOC_SETTIMEOUT, potential integer overflow...) The driver was added in 2003 and there's no evidence that it has any recent user, all changes seem to be tree-wide, subsystem-wide, or the result of static code analysis. So I believe we should simply drop this legacy piece of code. Signed-off-by: Jean Delvare Message-ID: <20241011170710.484a257a@endymion.delvare> Reviewed-by: Guenter Roeck --- Documentation/watchdog/watchdog-parameters.rst | 10 drivers/watchdog/Kconfig | 8 drivers/watchdog/Makefile | 1 drivers/watchdog/cpu5wdt.c | 285 ------------------------- 4 files changed, 304 deletions(-) --- linux-6.11.orig/Documentation/watchdog/watchdog-parameters.rst +++ linux-6.11/Documentation/watchdog/watchdog-parameters.rst @@ -120,16 +120,6 @@ modules. ------------------------------------------------- -cpu5wdt: - port: - base address of watchdog card, default is 0x91 - verbose: - be verbose, default is 0 (no) - ticks: - count down ticks, default is 10000 - -------------------------------------------------- - cpwd: wd0_timeout: Default watchdog0 timeout in 1/10secs --- linux-6.11.orig/drivers/watchdog/Kconfig +++ linux-6.11/drivers/watchdog/Kconfig @@ -1524,14 +1524,6 @@ config SBC7240_WDT To compile this driver as a module, choose M here: the module will be called sbc7240_wdt. -config CPU5_WDT - tristate "SMA CPU5 Watchdog" - depends on (X86 || COMPILE_TEST) && HAS_IOPORT - help - TBD. - To compile this driver as a module, choose M here: the - module will be called cpu5wdt. - config SMSC_SCH311X_WDT tristate "SMSC SCH311X Watchdog Timer" depends on (X86 || COMPILE_TEST) && HAS_IOPORT --- linux-6.11.orig/drivers/watchdog/Makefile +++ linux-6.11/drivers/watchdog/Makefile @@ -136,7 +136,6 @@ obj-$(CONFIG_RDC321X_WDT) += rdc321x_wdt obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o obj-$(CONFIG_SBC8360_WDT) += sbc8360.o obj-$(CONFIG_SBC7240_WDT) += sbc7240_wdt.o -obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o obj-$(CONFIG_SMSC_SCH311X_WDT) += sch311x_wdt.o obj-$(CONFIG_SMSC37B787_WDT) += smsc37b787_wdt.o obj-$(CONFIG_TQMX86_WDT) += tqmx86_wdt.o --- linux-6.11.orig/drivers/watchdog/cpu5wdt.c +++ /dev/null @@ -1,285 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * sma cpu5 watchdog driver - * - * Copyright (C) 2003 Heiko Ronsdorf - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -/* adjustable parameters */ - -static int verbose; -static int port = 0x91; -static int ticks = 10000; -static DEFINE_SPINLOCK(cpu5wdt_lock); - -#define PFX "cpu5wdt: " - -#define CPU5WDT_EXTENT 0x0A - -#define CPU5WDT_STATUS_REG 0x00 -#define CPU5WDT_TIME_A_REG 0x02 -#define CPU5WDT_TIME_B_REG 0x03 -#define CPU5WDT_MODE_REG 0x04 -#define CPU5WDT_TRIGGER_REG 0x07 -#define CPU5WDT_ENABLE_REG 0x08 -#define CPU5WDT_RESET_REG 0x09 - -#define CPU5WDT_INTERVAL (HZ/10+1) - -/* some device data */ - -static struct { - struct completion stop; - int running; - struct timer_list timer; - int queue; - int default_ticks; - unsigned long inuse; -} cpu5wdt_device; - -/* generic helper functions */ - -static void cpu5wdt_trigger(struct timer_list *unused) -{ - if (verbose > 2) - pr_debug("trigger at %i ticks\n", ticks); - - if (cpu5wdt_device.running) - ticks--; - - spin_lock(&cpu5wdt_lock); - /* keep watchdog alive */ - outb(1, port + CPU5WDT_TRIGGER_REG); - - /* requeue?? */ - if (cpu5wdt_device.queue && ticks) - mod_timer(&cpu5wdt_device.timer, jiffies + CPU5WDT_INTERVAL); - else { - /* ticks doesn't matter anyway */ - complete(&cpu5wdt_device.stop); - } - spin_unlock(&cpu5wdt_lock); - -} - -static void cpu5wdt_reset(void) -{ - ticks = cpu5wdt_device.default_ticks; - - if (verbose) - pr_debug("reset (%i ticks)\n", (int) ticks); - -} - -static void cpu5wdt_start(void) -{ - unsigned long flags; - - spin_lock_irqsave(&cpu5wdt_lock, flags); - if (!cpu5wdt_device.queue) { - cpu5wdt_device.queue = 1; - outb(0, port + CPU5WDT_TIME_A_REG); - outb(0, port + CPU5WDT_TIME_B_REG); - outb(1, port + CPU5WDT_MODE_REG); - outb(0, port + CPU5WDT_RESET_REG); - outb(0, port + CPU5WDT_ENABLE_REG); - mod_timer(&cpu5wdt_device.timer, jiffies + CPU5WDT_INTERVAL); - } - /* if process dies, counter is not decremented */ - cpu5wdt_device.running++; - spin_unlock_irqrestore(&cpu5wdt_lock, flags); -} - -static int cpu5wdt_stop(void) -{ - unsigned long flags; - - spin_lock_irqsave(&cpu5wdt_lock, flags); - if (cpu5wdt_device.running) - cpu5wdt_device.running = 0; - ticks = cpu5wdt_device.default_ticks; - spin_unlock_irqrestore(&cpu5wdt_lock, flags); - if (verbose) - pr_crit("stop not possible\n"); - return -EIO; -} - -/* filesystem operations */ - -static int cpu5wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &cpu5wdt_device.inuse)) - return -EBUSY; - return stream_open(inode, file); -} - -static int cpu5wdt_release(struct inode *inode, struct file *file) -{ - clear_bit(0, &cpu5wdt_device.inuse); - return 0; -} - -static long cpu5wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - unsigned int value; - static const struct watchdog_info ident = { - .options = WDIOF_CARDRESET, - .identity = "CPU5 WDT", - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof(ident))) - return -EFAULT; - break; - case WDIOC_GETSTATUS: - value = inb(port + CPU5WDT_STATUS_REG); - value = (value >> 2) & 1; - return put_user(value, p); - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - case WDIOC_SETOPTIONS: - if (get_user(value, p)) - return -EFAULT; - if (value & WDIOS_ENABLECARD) - cpu5wdt_start(); - if (value & WDIOS_DISABLECARD) - cpu5wdt_stop(); - break; - case WDIOC_KEEPALIVE: - cpu5wdt_reset(); - break; - default: - return -ENOTTY; - } - return 0; -} - -static ssize_t cpu5wdt_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - if (!count) - return -EIO; - cpu5wdt_reset(); - return count; -} - -static const struct file_operations cpu5wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .unlocked_ioctl = cpu5wdt_ioctl, - .compat_ioctl = compat_ptr_ioctl, - .open = cpu5wdt_open, - .write = cpu5wdt_write, - .release = cpu5wdt_release, -}; - -static struct miscdevice cpu5wdt_misc = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &cpu5wdt_fops, -}; - -/* init/exit function */ - -static int cpu5wdt_init(void) -{ - unsigned int val; - int err; - - if (verbose) - pr_debug("port=0x%x, verbose=%i\n", port, verbose); - - init_completion(&cpu5wdt_device.stop); - cpu5wdt_device.queue = 0; - timer_setup(&cpu5wdt_device.timer, cpu5wdt_trigger, 0); - cpu5wdt_device.default_ticks = ticks; - - if (!request_region(port, CPU5WDT_EXTENT, PFX)) { - pr_err("request_region failed\n"); - err = -EBUSY; - goto no_port; - } - - /* watchdog reboot? */ - val = inb(port + CPU5WDT_STATUS_REG); - val = (val >> 2) & 1; - if (!val) - pr_info("sorry, was my fault\n"); - - err = misc_register(&cpu5wdt_misc); - if (err < 0) { - pr_err("misc_register failed\n"); - goto no_misc; - } - - - pr_info("init success\n"); - return 0; - -no_misc: - release_region(port, CPU5WDT_EXTENT); -no_port: - return err; -} - -static int cpu5wdt_init_module(void) -{ - return cpu5wdt_init(); -} - -static void cpu5wdt_exit(void) -{ - if (cpu5wdt_device.queue) { - cpu5wdt_device.queue = 0; - wait_for_completion(&cpu5wdt_device.stop); - timer_shutdown_sync(&cpu5wdt_device.timer); - } - - misc_deregister(&cpu5wdt_misc); - - release_region(port, CPU5WDT_EXTENT); - -} - -static void cpu5wdt_exit_module(void) -{ - cpu5wdt_exit(); -} - -/* module entry points */ - -module_init(cpu5wdt_init_module); -module_exit(cpu5wdt_exit_module); - -MODULE_AUTHOR("Heiko Ronsdorf "); -MODULE_DESCRIPTION("sma cpu5 watchdog driver"); -MODULE_LICENSE("GPL"); - -module_param_hw(port, int, ioport, 0); -MODULE_PARM_DESC(port, "base address of watchdog card, default is 0x91"); - -module_param(verbose, int, 0); -MODULE_PARM_DESC(verbose, "be verbose, default is 0 (no)"); - -module_param(ticks, int, 0); -MODULE_PARM_DESC(ticks, "count down ticks, default is 10000");