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iwlagn: check DMA mapping errors

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DMA mappings can fail, but the current code
doesn't check for that. Add checking, which
requires some restructuring for proper error
paths.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
This commit is contained in:
Johannes Berg 2011-04-28 07:27:10 -07:00 committed by Wey-Yi Guy
parent 94b00658ff
commit 2c46f72e06
2 changed files with 45 additions and 28 deletions
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60
drivers/net/wireless/iwlwifi/iwl-agn-tx.c
View file

@ -537,7 +537,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
struct iwl_tx_cmd *tx_cmd;
struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
int txq_id;
dma_addr_t phys_addr;
dma_addr_t phys_addr = 0;
dma_addr_t txcmd_phys;
dma_addr_t scratch_phys;
u16 len, firstlen, secondlen;
@ -564,7 +564,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
spin_lock_irqsave(&priv->lock, flags);
if (iwl_is_rfkill(priv)) {
IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
goto drop_unlock;
goto drop_unlock_priv;
}
fc = hdr->frame_control;
@ -585,7 +585,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
hdr->addr1);
goto drop_unlock;
goto drop_unlock_priv;
}
IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
@ -628,10 +628,10 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
if (ieee80211_is_data_qos(fc)) {
qc = ieee80211_get_qos_ctl(hdr);
tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
if (WARN_ON_ONCE(tid >= MAX_TID_COUNT)) {
spin_unlock(&priv->sta_lock);
goto drop_unlock;
}
if (WARN_ON_ONCE(tid >= MAX_TID_COUNT))
goto drop_unlock_sta;
seq_number = priv->stations[sta_id].tid[tid].seq_number;
seq_number &= IEEE80211_SCTL_SEQ;
hdr->seq_ctrl = hdr->seq_ctrl &
@ -649,18 +649,8 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
txq = &priv->txq[txq_id];
q = &txq->q;
if (unlikely(iwl_queue_space(q) < q->high_mark)) {
spin_unlock(&priv->sta_lock);
goto drop_unlock;
}
if (ieee80211_is_data_qos(fc)) {
priv->stations[sta_id].tid[tid].tfds_in_queue++;
if (!ieee80211_has_morefrags(fc))
priv->stations[sta_id].tid[tid].seq_number = seq_number;
}
spin_unlock(&priv->sta_lock);
if (unlikely(iwl_queue_space(q) < q->high_mark))
goto drop_unlock_sta;
/* Set up driver data for this TFD */
memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
@ -724,12 +714,10 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
txcmd_phys = pci_map_single(priv->pci_dev,
&out_cmd->hdr, firstlen,
PCI_DMA_BIDIRECTIONAL);
if (unlikely(pci_dma_mapping_error(priv->pci_dev, txcmd_phys)))
goto drop_unlock_sta;
dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
dma_unmap_len_set(out_meta, len, firstlen);
/* Add buffer containing Tx command and MAC(!) header to TFD's
* first entry */
priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
txcmd_phys, firstlen, 1, 0);
if (!ieee80211_has_morefrags(hdr->frame_control)) {
txq->need_update = 1;
@ -744,10 +732,30 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
if (secondlen > 0) {
phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
secondlen, PCI_DMA_TODEVICE);
if (unlikely(pci_dma_mapping_error(priv->pci_dev, phys_addr))) {
pci_unmap_single(priv->pci_dev,
dma_unmap_addr(out_meta, mapping),
dma_unmap_len(out_meta, len),
PCI_DMA_BIDIRECTIONAL);
goto drop_unlock_sta;
}
}
if (ieee80211_is_data_qos(fc)) {
priv->stations[sta_id].tid[tid].tfds_in_queue++;
if (!ieee80211_has_morefrags(fc))
priv->stations[sta_id].tid[tid].seq_number = seq_number;
}
spin_unlock(&priv->sta_lock);
/* Attach buffers to TFD */
priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
txcmd_phys, firstlen, 1, 0);
if (secondlen > 0)
priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
phys_addr, secondlen,
0, 0);
}
scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
offsetof(struct iwl_tx_cmd, scratch);
@ -813,7 +821,9 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
return 0;
drop_unlock:
drop_unlock_sta:
spin_unlock(&priv->sta_lock);
drop_unlock_priv:
spin_unlock_irqrestore(&priv->lock, flags);
return -1;
}

13
drivers/net/wireless/iwlwifi/iwl-tx.c
View file

@ -500,7 +500,6 @@ int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
}
memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
out_meta->flags = cmd->flags | CMD_MAPPED;
if (cmd->flags & CMD_WANT_SKB)
out_meta->source = cmd;
if (cmd->flags & CMD_ASYNC)
@ -538,13 +537,20 @@ int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
q->write_ptr, idx, priv->cmd_queue);
}
#endif
txq->need_update = 1;
phys_addr = pci_map_single(priv->pci_dev, &out_cmd->hdr,
fix_size, PCI_DMA_BIDIRECTIONAL);
if (unlikely(pci_dma_mapping_error(priv->pci_dev, phys_addr))) {
idx = -ENOMEM;
goto out;
}
dma_unmap_addr_set(out_meta, mapping, phys_addr);
dma_unmap_len_set(out_meta, len, fix_size);
out_meta->flags = cmd->flags | CMD_MAPPED;
txq->need_update = 1;
trace_iwlwifi_dev_hcmd(priv, &out_cmd->hdr, fix_size, cmd->flags);
priv->cfg->ops->lib->txq_attach_buf_to_tfd(priv, txq,
@ -555,6 +561,7 @@ int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
iwl_txq_update_write_ptr(priv, txq);
out:
spin_unlock_irqrestore(&priv->hcmd_lock, flags);
return idx;
}