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iwlwifi: fix userspace setting of sleep_level_override 

The sleep_level_override debugfs file is used by the user to request a
static power index instead of the dynamic sleep values. Users are expected
to provide value from 1 to 5 as an index or -1 to disable it.

The problem at the moment is that users can also provide 0 to this file
which, together with the value 1, is translated to index 1. This is
confusing and even more so when users write 0 to sleep_level_override and
then read 1 from it afterwards.

Modify checking to treat 0 as invalid.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Reinette Chatre 2009-10-09 13:20:25 -07:00 committed by John W. Linville
parent 55036d6602
commit 1a34c04380
1 changed files with 3 additions and 1 deletions
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4
drivers/net/wireless/iwlwifi/iwl-debugfs.c
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@ -801,7 +801,9 @@ static ssize_t iwl_dbgfs_sleep_level_override_write(struct file *file,
* valid here. However, let's not confuse them and present
* IWL_POWER_INDEX_1 as "1", not "0".
*/
if (value > 0)
if (value == 0)
return -EINVAL;
else if (value > 0)
value -= 1;
if (value != -1 && (value < 0 || value >= IWL_POWER_NUM))