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iwlwifi: pcie: WARN upon traffic while flushing TX queues 

This must not happen - otherwise we might keep flushing
forever.

Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Emmanuel Grumbach 2014-03-24 11:25:48 +02:00
parent 3cafdbe6ad
commit fa1a91fd76
1 changed files with 14 additions and 2 deletions
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16
drivers/net/wireless/iwlwifi/pcie/trans.c
View File

@ -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,