iwlwifi: mvm: writing zero bytes to debugfs causes a crash

[karo-tx-linux.git] / drivers / net / wireless / intel / iwlwifi / mvm / debugfs.c

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index a260cd5032005bcbf520e98f8be188750c987439..077bfd8f4c0cd85505a3ef7de375bfbaf4cddef5 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -1056,6 +1056,8 @@ static ssize_t iwl_dbgfs_fw_dbg_collect_write(struct iwl_mvm *mvm,
 
        if (ret)
                return ret;
+       if (count == 0)
+               return 0;
 
        iwl_mvm_fw_dbg_collect(mvm, FW_DBG_TRIGGER_USER, buf,
                               (count - 1), NULL);