diff options
| author | Tony Camuso <tcamuso@redhat.com> | 2017-04-10 12:22:13 -0400 |
|---|---|---|
| committer | Corey Minyard <cminyard@mvista.com> | 2017-04-10 12:42:10 -0500 |
| commit | 3f724c408a7bcf25609f6a0102b835d5970cadd3 (patch) | |
| tree | 018a97b7d1f977fe65204c4780181a0089bb5111 /drivers/char | |
| parent | 7ecaff7733b50da8e02d22be6719069892633c53 (diff) | |
| download | linux-3f724c408a7bcf25609f6a0102b835d5970cadd3.tar.bz2 | |
ipmi_si: use smi_num for init_name
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>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/ipmi/ipmi_si_intf.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c index 2a7c425ddfa7..b2b618f066e0 100644 --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -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 @@ out_err: 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]); |