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ipmi: Use a temporary BMC for an interface 

This is getting ready for the ability to redo the BMC if it's
information changes, we need a fallback mechanism.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Corey Minyard 2017-09-01 15:34:10 -05:00
parent 28f26ac7a9
commit c659ff34f6
1 changed files with 13 additions and 9 deletions
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22
drivers/char/ipmi/ipmi_msghandler.c
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@ -418,6 +418,7 @@ struct ipmi_smi {
*/
struct mutex bmc_reg_mutex;
struct bmc_device tmp_bmc;
struct bmc_device *bmc;
bool bmc_registered;
struct list_head bmc_link;
@ -2839,7 +2840,7 @@ static void ipmi_bmc_unregister(ipmi_smi_t intf)
mutex_lock(&bmc->dyn_mutex);
list_del(&intf->bmc_link);
mutex_unlock(&bmc->dyn_mutex);
intf->bmc = NULL;
intf->bmc = &intf->tmp_bmc;
mutex_lock(&ipmidriver_mutex);
kref_put(&bmc->usecount, cleanup_bmc_device);
mutex_unlock(&ipmidriver_mutex);
@ -2872,7 +2873,6 @@ static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum)
* otherwise register the new BMC device
*/
if (old_bmc) {
kfree(bmc);
bmc = old_bmc;
intf->bmc = old_bmc;
mutex_lock(&bmc->dyn_mutex);
@ -2886,6 +2886,14 @@ static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum)
bmc->id.product_id,
bmc->id.device_id);
} else {
bmc = kzalloc(sizeof(*bmc), GFP_KERNEL);
if (!bmc) {
rv = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&bmc->intfs);
mutex_init(&bmc->dyn_mutex);
bmc->pdev.name = "ipmi_bmc";
rv = ida_simple_get(&ipmi_bmc_ida, 0, 0, GFP_KERNEL);
@ -2968,7 +2976,7 @@ out_put_bmc:
mutex_lock(&bmc->dyn_mutex);
list_del(&intf->bmc_link);
mutex_unlock(&bmc->dyn_mutex);
intf->bmc = NULL;
intf->bmc = &intf->tmp_bmc;
mutex_lock(&ipmidriver_mutex);
kref_put(&bmc->usecount, cleanup_bmc_device);
mutex_unlock(&ipmidriver_mutex);
@ -2978,7 +2986,7 @@ out_list_del:
mutex_lock(&bmc->dyn_mutex);
list_del(&intf->bmc_link);
mutex_unlock(&bmc->dyn_mutex);
intf->bmc = NULL;
intf->bmc = &intf->tmp_bmc;
put_device(&bmc->pdev.dev);
goto out;
}
@ -3204,11 +3212,7 @@ int ipmi_register_smi(const struct ipmi_smi_handlers *handlers,
if (!intf)
return -ENOMEM;
intf->bmc = kzalloc(sizeof(*intf->bmc), GFP_KERNEL);
if (!intf->bmc) {
kfree(intf);
return -ENOMEM;
}
intf->bmc = &intf->tmp_bmc;
INIT_LIST_HEAD(&intf->bmc->intfs);
mutex_init(&intf->bmc->dyn_mutex);
INIT_LIST_HEAD(&intf->bmc_link);