sony_acpi: Allow easier debugging for the unknown SNC methods.

Allow the existence of a setter method without a getter and viceversa,
additionaly set /proc file permissions reflecting it.
Fix also the error exit path.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 21 insertions, 9 deletions

diff --git a/drivers/acpi/sony_acpi.c b/drivers/acpi/sony_acpi.c
index 138f2b6184d3..69122ad778f5 100644
--- a/drivers/acpi/sony_acpi.c
+++ b/drivers/acpi/sony_acpi.c
@@ -296,6 +296,7 @@ static int sony_acpi_add(struct acpi_device *device)
         acpi_status status;
         int result;
         acpi_handle handle;
+        mode_t proc_file_mode;
         struct sony_acpi_value *item;
 
         sony_acpi_acpi_device = device;
@@ -334,20 +335,31 @@ static int sony_acpi_add(struct acpi_device *device)
         }
 
         for (item = sony_acpi_values; item->name; ++item) {
+                proc_file_mode = 0;
+
                 if (!debug && item->debug)
                         continue;
 
                 if (item->acpiget &&
-                    ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
+                    ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle,
                                  item->acpiget, &handle)))
-                        continue;
+                        proc_file_mode = S_IRUSR;
+                else
+                        printk(LOG_PFX "unable to get ACPI handle for %s (get)\n",
+                                        item->name);
 
                 if (item->acpiset &&
-                    ACPI_FAILURE(acpi_get_handle(sony_acpi_handle,
+                    ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle,
                                  item->acpiset, &handle)))
-                        continue;
+                        proc_file_mode |= S_IWUSR;
+                else
+                        printk(LOG_PFX "unable to get ACPI handle for %s (set)\n",
+                                        item->name);
+
+                if (proc_file_mode == 0)
+                        continue;
 
-                item->proc = create_proc_entry(item->name, 0666,
+                item->proc = create_proc_entry(item->name, proc_file_mode,
                                                acpi_device_dir(device));
                 if (!item->proc) {
                         printk(LOG_PFX "unable to create proc entry\n");
@@ -366,15 +378,15 @@ static int sony_acpi_add(struct acpi_device *device)
         return 0;
 
 outproc:
+        for (item = sony_acpi_values; item->name; ++item)
+                if (item->proc)
+                        remove_proc_entry(item->name, acpi_device_dir(device));
+outnotify:
         status = acpi_remove_notify_handler(sony_acpi_handle,
                                             ACPI_DEVICE_NOTIFY,
                                             sony_acpi_notify);
         if (ACPI_FAILURE(status))
                 printk(LOG_PFX "unable to remove notify handler\n");
-outnotify:
-        for (item = sony_acpi_values; item->name; ++item)
-                if (item->proc)
-                        remove_proc_entry(item->name, acpi_device_dir(device));
 outwalk:
         return result;
 }