Messages in this thread |  | | | Subject | Re: [KJ][PATCH] Correct misc_register return code handling in several drivers | | From | Benjamin Herrenschmidt <> | | Date | Tue, 24 Oct 2006 13:34:34 +1000 |
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On Mon, 2006-10-23 at 13:19 -0400, Neil Horman wrote: > Hey All- > Janitor patch to clean up return code handling and exit from failed > calls to misc_register accross several modules.
The patch doesn't match the description... What are those INIT_LIST_HEAD things ? Is this something I've missed or is this a new requirement for all misc devices ? Can't it be statically initialized instead ?
> Thanks & Regards > Neil > > Signed-off-by: Neil Horman <nhorman@tuxdriver.com> > > > drivers/char/mmtimer.c | 29 +++++++++++++++++++++++------ > drivers/char/tpm/tpm.c | 1 + > drivers/input/misc/hp_sdc_rtc.c | 6 +++++- > drivers/macintosh/apm_emu.c | 5 ++++- > drivers/net/tun.c | 2 ++ > fs/dlm/user.c | 1 + > 6 files changed, 36 insertions(+), 8 deletions(-) > > > diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c > --- a/drivers/char/mmtimer.c > +++ b/drivers/char/mmtimer.c > @@ -669,6 +669,7 @@ static struct k_clock sgi_clock = { > static int __init mmtimer_init(void) > { > unsigned i; > + int err = -1; > cnodeid_t node, maxn = -1; > > if (!ia64_platform_is("sn2")) > @@ -680,7 +681,7 @@ static int __init mmtimer_init(void) > if (sn_rtc_cycles_per_second < 100000) { > printk(KERN_ERR "%s: unable to determine clock frequency\n", > MMTIMER_NAME); > - return -1; > + goto out; > } > > mmtimer_femtoperiod = ((unsigned long)1E15 + sn_rtc_cycles_per_second / > @@ -689,13 +690,13 @@ static int __init mmtimer_init(void) > if (request_irq(SGI_MMTIMER_VECTOR, mmtimer_interrupt, IRQF_PERCPU, MMTIMER_NAME, NULL)) { > printk(KERN_WARNING "%s: unable to allocate interrupt.", > MMTIMER_NAME); > - return -1; > + goto out; > } > > if (misc_register(&mmtimer_miscdev)) { > printk(KERN_ERR "%s: failed to register device\n", > MMTIMER_NAME); > - return -1; > + goto out1; > } > > /* Get max numbered node, calculate slots needed */ > @@ -709,16 +710,18 @@ static int __init mmtimer_init(void) > if (timers == NULL) { > printk(KERN_ERR "%s: failed to allocate memory for device\n", > MMTIMER_NAME); > - return -1; > + goto out2; > } > > + memset(timers,0,(sizeof(mmtimer_t *)*maxn)); > + > /* Allocate mmtimer_t's for each online node */ > for_each_online_node(node) { > timers[node] = kmalloc_node(sizeof(mmtimer_t)*NUM_COMPARATORS, GFP_KERNEL, node); > if (timers[node] == NULL) { > printk(KERN_ERR "%s: failed to allocate memory for device\n", > MMTIMER_NAME); > - return -1; > + goto out3; > } > for (i=0; i< NUM_COMPARATORS; i++) { > mmtimer_t * base = timers[node] + i; > @@ -738,7 +741,21 @@ static int __init mmtimer_init(void) > printk(KERN_INFO "%s: v%s, %ld MHz\n", MMTIMER_DESC, MMTIMER_VERSION, > sn_rtc_cycles_per_second/(unsigned long)1E6); > > - return 0; > + err = 0; > +out: > + return err; > + > +out3: > + for_each_online_node(node) { > + if(timers[node] != NULL) > + kfree(timers[node]); > + } > +out2: > + misc_deregister(&mmtimer_miscdev); > +out1: > + free_irq(SGI_MMTIMER_VECTOR, NULL); > + goto out; > + > } > > module_init(mmtimer_init); > diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c > --- a/drivers/char/tpm/tpm.c > +++ b/drivers/char/tpm/tpm.c > @@ -1155,6 +1155,7 @@ #define DEVNAME_SIZE 7 > > if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { > list_del(&chip->list); > + misc_deregister(&chip->vendor.miscdev); > put_device(dev); > clear_bit(chip->dev_num, dev_mask); > kfree(chip); > diff --git a/drivers/input/misc/hp_sdc_rtc.c b/drivers/input/misc/hp_sdc_rtc.c > --- a/drivers/input/misc/hp_sdc_rtc.c > +++ b/drivers/input/misc/hp_sdc_rtc.c > @@ -693,9 +693,13 @@ static int __init hp_sdc_rtc_init(void) > > init_MUTEX(&i8042tregs); > > + INIT_LIST_HEAD(&hp_sdc_rtc_dev.list); > + > if ((ret = hp_sdc_request_timer_irq(&hp_sdc_rtc_isr))) > return ret; > - misc_register(&hp_sdc_rtc_dev); > + if (misc_register(&hp_sdc_rtc_dev) != 0) > + printk(KERN_INFO "Could not register misc. dev for sdc\n"); > + > create_proc_read_entry ("driver/rtc", 0, NULL, > hp_sdc_rtc_read_proc, NULL); > > diff --git a/drivers/macintosh/apm_emu.c b/drivers/macintosh/apm_emu.c > --- a/drivers/macintosh/apm_emu.c > +++ b/drivers/macintosh/apm_emu.c > @@ -520,6 +520,8 @@ static int __init apm_emu_init(void) > { > struct proc_dir_entry *apm_proc; > > + INIT_LIST_HEAD(&apm_device.list); > + > if (sys_ctrler != SYS_CTRLER_PMU) { > printk(KERN_INFO "apm_emu: Requires a machine with a PMU.\n"); > return -ENODEV; > @@ -529,7 +531,8 @@ static int __init apm_emu_init(void) > if (apm_proc) > apm_proc->owner = THIS_MODULE; > > - misc_register(&apm_device); > + if (misc_register(&apm_device) != 0) > + printk(KERN_INFO "Could not create misc. device for apm\n"); > > pmu_register_sleep_notifier(&apm_sleep_notifier); > > diff --git a/drivers/net/tun.c b/drivers/net/tun.c > --- a/drivers/net/tun.c > +++ b/drivers/net/tun.c > @@ -856,6 +856,8 @@ static int __init tun_init(void) > printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); > printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); > > + INIT_LIST_HEAD(&tun_miscdev.list); > + > ret = misc_register(&tun_miscdev); > if (ret) > printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); > diff --git a/fs/dlm/user.c b/fs/dlm/user.c > --- a/fs/dlm/user.c > +++ b/fs/dlm/user.c > @@ -773,6 +773,7 @@ int dlm_user_init(void) > ctl_device.name = "dlm-control"; > ctl_device.fops = &ctl_device_fops; > ctl_device.minor = MISC_DYNAMIC_MINOR; > + INIT_LIST_HEAD(&ctl_device.list); > > error = misc_register(&ctl_device); > if (error)
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