Messages in this thread | | | Date | Tue, 26 Apr 2011 11:52:22 +0100 | From | Alan Cox <> | Subject | Re: [PATCH 2/2] watchdog: add real function on MOXA V2100 watchdog driver |
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> + superio_set_logic_device(7); /* logic device 7 */ > + superio_set_reg((swtd_ack_time/1000), 0x73); /* Reg:F6,30 sec */ > +}
If the time is configurable then you want to support that ideally.
> +static void swtd_reboot(void *unused)
No - the watchdog driver needs to deal with hardware reboot, randomly trying to exec things which may not even be where you expect isn't safe. User space watchdog daemons can manage their own shutdown just fine. The watchdog is there to catch the actual hang case.
> + superio_set_reg(1000/1000, 0x73); > + > + return NOTIFY_OK; > + > + spin_unlock_bh(&swtd_lock);
Wrong order - your lock is left locked !
> +static struct miscdevice wdt_miscdev = { > + .minor = MOXA_WATCHDOG_MINOR, > + .name = "swtd", > + .fops = &moxa_swtd_fops, > +};
This should use the standard watchdog device
> +moxa_swtd_init_err3: > + remove_proc_entry("driver/swtd", NULL); > +moxa_swtd_init_err2: > + if (timer_pending(&timer_swtd)) > + del_timer(&timer_swtd);
del_timer_sync to ensure it has run
You also need to sort out locking.
There is also no test to ensure the hardware is present so the driver isn't safe to load on any PC hardware
Is there a magic signature to detect the hardware ?
Alan
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