openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

iwlwifi: pcie: don't init a Tx queue with an SSN > size of the queue 

The TVQM tells us the initial write pointer for a queue,
but that write pointer is in WiFi sequence number unit
and not in TFD index unit. Which means that the write
pointer in the TVQM's response can be bigger than the
Tx queue ring size.

Fix that by modulo'ing the write pointer from the TVQM
with the Tx queue size.

Fixes: 66128fa08806 ("iwlwifi: move to TVQM mode")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Emmanuel Grumbach 2017-07-13 09:49:32 +03:00 committed by Luca Coelho
parent 732d06e9d9
commit 39fff75993
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/wireless/intel/iwlwifi/pcie/tx-gen2.c
View File

@ -1033,6 +1033,7 @@ int iwl_trans_pcie_dyn_txq_alloc(struct iwl_trans *trans,
.flags = CMD_WANT_SKB,
};
int ret, qid;
u32 wr_ptr;
txq = kzalloc(sizeof(*txq), GFP_KERNEL);
if (!txq)
@ -1073,6 +1074,7 @@ int iwl_trans_pcie_dyn_txq_alloc(struct iwl_trans *trans,
rsp = (void *)hcmd.resp_pkt->data;
qid = le16_to_cpu(rsp->queue_number);
wr_ptr = le16_to_cpu(rsp->write_pointer);
if (qid >= ARRAY_SIZE(trans_pcie->txq)) {
WARN_ONCE(1, "queue index %d unsupported", qid);
@ -1088,10 +1090,11 @@ int iwl_trans_pcie_dyn_txq_alloc(struct iwl_trans *trans,
txq->id = qid;
trans_pcie->txq[qid] = txq;
wr_ptr &= (TFD_QUEUE_SIZE_MAX - 1);
/* Place first TFD at index corresponding to start sequence number */
txq->read_ptr = le16_to_cpu(rsp->write_pointer);
txq->write_ptr = le16_to_cpu(rsp->write_pointer);
txq->read_ptr = wr_ptr;
txq->write_ptr = wr_ptr;
iwl_write_direct32(trans, HBUS_TARG_WRPTR,
(txq->write_ptr) | (qid << 16));
IWL_DEBUG_TX_QUEUES(trans, "Activate queue %d\n", qid);