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>

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 4891c39b3259518170bd02871b41562bfbac7eb6..d5a2bd7230b23d9abe778102c00cd95981ec0951 100644 (file)
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -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,