From: Emmanuel Grumbach Date: Thu, 8 May 2014 09:15:22 +0000 (+0300) Subject: iwlwifi: pcie: try to get ownership several times X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bc3e3ff65a157cc6ef43e2279cfac6cf7cdcbbbe;p=karo-tx-linux.git iwlwifi: pcie: try to get ownership several times commit 501fd9895c1d7d8161ed56698ae2fccb10ef14f5 upstream. Some races with the hardware can happen when we take ownership of the device. Don't give up after the first try. Reviewed-by: Johannes Berg Signed-off-by: Emmanuel Grumbach Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c index 8d42fd9b0811..16be0c07c64a 100644 --- a/drivers/net/wireless/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/iwlwifi/pcie/trans.c @@ -318,6 +318,7 @@ static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans) { int ret; int t = 0; + int iter; IWL_DEBUG_INFO(trans, "iwl_trans_prepare_card_hw enter\n"); @@ -326,18 +327,23 @@ static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans) if (ret >= 0) return 0; - /* If HW is not ready, prepare the conditions to check again */ - iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, - CSR_HW_IF_CONFIG_REG_PREPARE); + for (iter = 0; iter < 10; iter++) { + /* If HW is not ready, prepare the conditions to check again */ + iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG, + CSR_HW_IF_CONFIG_REG_PREPARE); + + do { + ret = iwl_pcie_set_hw_ready(trans); + if (ret >= 0) + return 0; - do { - ret = iwl_pcie_set_hw_ready(trans); - if (ret >= 0) - return 0; + usleep_range(200, 1000); + t += 200; + } while (t < 150000); + msleep(25); + } - usleep_range(200, 1000); - t += 200; - } while (t < 150000); + IWL_DEBUG_INFO(trans, "got NIC after %d iterations\n", iter); return ret; }