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ipmi: Use is_visible callback for conditional sysfs entries 

Instead of manual calls of device_create_file() and
device_remove_file(), implement the condition in is_visible callback
for the attribute group and put these entries to the group, too.
This simplifies the code and avoids the possible races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Takashi Iwai 2015-02-04 15:36:14 +01:00 committed by Corey Minyard
parent bdf2829cb6
commit 2d06a0c9b3
1 changed files with 17 additions and 43 deletions
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60
drivers/char/ipmi/ipmi_msghandler.c
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@ -2366,11 +2366,28 @@ static struct attribute *bmc_dev_attrs[] = {
&dev_attr_additional_device_support.attr,
&dev_attr_manufacturer_id.attr,
&dev_attr_product_id.attr,
&dev_attr_aux_firmware_revision.attr,
&dev_attr_guid.attr,
NULL
};
static umode_t bmc_dev_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int idx)
{
struct device *dev = kobj_to_dev(kobj);
struct bmc_device *bmc = to_bmc_device(dev);
umode_t mode = attr->mode;
if (attr == &dev_attr_aux_firmware_revision.attr)
return bmc->id.aux_firmware_revision_set ? mode : 0;
if (attr == &dev_attr_guid.attr)
return bmc->guid_set ? mode : 0;
return mode;
}
static struct attribute_group bmc_dev_attr_group = {
.attrs = bmc_dev_attrs,
.is_visible = bmc_dev_attr_is_visible,
};
static const struct attribute_group *bmc_dev_attr_groups[] = {
@ -2393,13 +2410,6 @@ cleanup_bmc_device(struct kref *ref)
{
struct bmc_device *bmc = container_of(ref, struct bmc_device, usecount);
if (bmc->id.aux_firmware_revision_set)
device_remove_file(&bmc->pdev.dev,
&dev_attr_aux_firmware_revision);
if (bmc->guid_set)
device_remove_file(&bmc->pdev.dev,
&dev_attr_guid);
platform_device_unregister(&bmc->pdev);
}
@ -2420,33 +2430,6 @@ static void ipmi_bmc_unregister(ipmi_smi_t intf)
mutex_unlock(&ipmidriver_mutex);
}
static int create_bmc_files(struct bmc_device *bmc)
{
int err;
if (bmc->id.aux_firmware_revision_set) {
err = device_create_file(&bmc->pdev.dev,
&dev_attr_aux_firmware_revision);
if (err)
goto out;
}
if (bmc->guid_set) {
err = device_create_file(&bmc->pdev.dev,
&dev_attr_guid);
if (err)
goto out_aux_firm;
}
return 0;
out_aux_firm:
if (bmc->id.aux_firmware_revision_set)
device_remove_file(&bmc->pdev.dev,
&dev_attr_aux_firmware_revision);
out:
return err;
}
static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum)
{
int rv;
@ -2535,15 +2518,6 @@ static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum)
return rv;
}
rv = create_bmc_files(bmc);
if (rv) {
mutex_lock(&ipmidriver_mutex);
platform_device_unregister(&bmc->pdev);
mutex_unlock(&ipmidriver_mutex);
return rv;
}
dev_info(intf->si_dev, "Found new BMC (man_id: 0x%6.6x, "
"prod_id: 0x%4.4x, dev_id: 0x%2.2x)\n",
bmc->id.manufacturer_id,