From: Emmanuel Grumbach Date: Mon, 24 Mar 2014 09:25:48 +0000 (+0200) Subject: iwlwifi: pcie: WARN upon traffic while flushing TX queues X-Git-Tag: v3.16-rc1~27^2~279^2^2~54^2~27 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=fa1a91fd76a1fda3ff59b84ed5ab7bf7fd72b2c4;p=~emulex%2Finfiniband.git iwlwifi: pcie: WARN upon traffic while flushing TX queues This must not happen - otherwise we might keep flushing forever. Reviewed-by: Johannes Berg Signed-off-by: Emmanuel Grumbach --- diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c index 0f20e73b259..4845d5019c4 100644 --- a/drivers/net/wireless/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/iwlwifi/pcie/trans.c @@ -1270,6 +1270,8 @@ static int iwl_trans_pcie_wait_txq_empty(struct iwl_trans *trans, u32 txq_bm) /* waiting for all the tx frames complete might take a while */ for (cnt = 0; cnt < trans->cfg->base_params->num_of_queues; cnt++) { + u8 wr_ptr; + if (cnt == trans_pcie->cmd_queue) continue; if (!test_bit(cnt, trans_pcie->queue_used)) @@ -1278,9 +1280,19 @@ static int iwl_trans_pcie_wait_txq_empty(struct iwl_trans *trans, u32 txq_bm) continue; txq = &trans_pcie->txq[cnt]; q = &txq->q; - while (q->read_ptr != q->write_ptr && !time_after(jiffies, - now + msecs_to_jiffies(IWL_FLUSH_WAIT_MS))) + wr_ptr = ACCESS_ONCE(q->write_ptr); + + while (q->read_ptr != ACCESS_ONCE(q->write_ptr) && + !time_after(jiffies, + now + msecs_to_jiffies(IWL_FLUSH_WAIT_MS))) { + u8 write_ptr = ACCESS_ONCE(q->write_ptr); + + if (WARN_ONCE(wr_ptr != write_ptr, + "WR pointer moved while flushing %d -> %d\n", + wr_ptr, write_ptr)) + return -ETIMEDOUT; msleep(1); + } if (q->read_ptr != q->write_ptr) { IWL_ERR(trans,