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ipmi_si: use smi_num for init_name

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Commit 1abf71e moved the creation of new_smi->dev to earlier in the init
sequence in order to provide infrastructure for log printing.

However, the init_name was created with a hard-coded value of zero. This
presents a problem in systems with more than one interface, producing a
call trace in dmesg.

To correct the problem, simply use smi_num instead of the hard-coded
value of zero.

Tested on a lenovo x3950.

Signed-off-by: Tony Camuso <tcamuso@redhat.com>

There was actually a more general problem, the platform device wasn't
being set correctly, either, and there was a possible (though extremely
unlikely) race on smi_num.  Add locks to clean up the race and use the
proper value for the platform device, too.

Tested on qemu in various configurations.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Tony Camuso 2017-04-10 12:22:13 -04:00 committed by Corey Minyard
parent 7ecaff7733
commit 3f724c408a
1 changed files with 16 additions and 3 deletions
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19
drivers/char/ipmi/ipmi_si_intf.c
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@ -1954,7 +1954,9 @@ static int hotmod_handler(const char *val, struct kernel_param *kp)
kfree(info);
goto out;
}
mutex_lock(&smi_infos_lock);
rv = try_smi_init(info);
mutex_unlock(&smi_infos_lock);
if (rv) {
cleanup_one_si(info);
goto out;
@ -2042,8 +2044,10 @@ static int hardcode_find_bmc(void)
info->slave_addr = slave_addrs[i];
if (!add_smi(info)) {
mutex_lock(&smi_infos_lock);
if (try_smi_init(info))
cleanup_one_si(info);
mutex_unlock(&smi_infos_lock);
ret = 0;
} else {
kfree(info);
@ -3492,6 +3496,11 @@ static int add_smi(struct smi_info *new_smi)
return rv;
}
/*
* Try to start up an interface. Must be called with smi_infos_lock
* held, primarily to keep smi_num consistent, we only one to do these
* one at a time.
*/
static int try_smi_init(struct smi_info *new_smi)
{
int rv = 0;
@ -3524,9 +3533,12 @@ static int try_smi_init(struct smi_info *new_smi)
goto out_err;
}
new_smi->intf_num = smi_num;
/* Do this early so it's available for logs. */
if (!new_smi->dev) {
init_name = kasprintf(GFP_KERNEL, "ipmi_si.%d", 0);
init_name = kasprintf(GFP_KERNEL, "ipmi_si.%d",
new_smi->intf_num);
/*
* If we don't already have a device from something
@ -3593,8 +3605,6 @@ static int try_smi_init(struct smi_info *new_smi)
new_smi->interrupt_disabled = true;
atomic_set(&new_smi->need_watch, 0);
new_smi->intf_num = smi_num;
smi_num++;
rv = try_enable_event_buffer(new_smi);
if (rv == 0)
@ -3661,6 +3671,9 @@ static int try_smi_init(struct smi_info *new_smi)
goto out_err_stop_timer;
}
/* Don't increment till we know we have succeeded. */
smi_num++;
dev_info(new_smi->dev, "IPMI %s interface initialized\n",
si_to_str[new_smi->si_type]);