iwlegacy: more checks for dma mapping errors

This patch check output of pci_map_single() calls. I missed them on
my previous patch "iwlegacy: check for dma mapping errors", which
fixed only pci_map_page() calls.

To handle remaining possible dma mappings errors, we need to rearrange
ilXXXX_tx_skb() and il_enqueue_hcmd() functions.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 59 insertions, 44 deletions

diff --git a/drivers/net/wireless/iwlegacy/3945-mac.c b/drivers/net/wireless/iwlegacy/3945-mac.c
index 83856d1a6101..3630a41df50d 100644
--- a/drivers/net/wireless/iwlegacy/3945-mac.c
+++ b/drivers/net/wireless/iwlegacy/3945-mac.c
@@ -572,26 +572,11 @@ il3945_tx_skb(struct il_priv *il,
         il3945_hw_build_tx_cmd_rate(il, out_cmd, info, hdr, sta_id);
 
         /* Total # bytes to be transmitted */
-        len = (u16) skb->len;
-        tx_cmd->len = cpu_to_le16(len);
+        tx_cmd->len = cpu_to_le16((u16) skb->len);
 
-        il_update_stats(il, true, fc, len);
         tx_cmd->tx_flags &= ~TX_CMD_FLG_ANT_A_MSK;
         tx_cmd->tx_flags &= ~TX_CMD_FLG_ANT_B_MSK;
 
-        if (!ieee80211_has_morefrags(hdr->frame_control)) {
-                txq->need_update = 1;
-        } else {
-                wait_write_ptr = 1;
-                txq->need_update = 0;
-        }
-
-        D_TX("sequence nr = 0X%x\n", le16_to_cpu(out_cmd->hdr.sequence));
-        D_TX("tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
-        il_print_hex_dump(il, IL_DL_TX, tx_cmd, sizeof(*tx_cmd));
-        il_print_hex_dump(il, IL_DL_TX, (u8 *) tx_cmd->hdr,
-                          ieee80211_hdrlen(fc));
-
         /*
          * Use the first empty entry in this queue's command buffer array
          * to contain the Tx command and MAC header concatenated together
@@ -610,14 +595,8 @@ il3945_tx_skb(struct il_priv *il,
          * within command buffer array. */
         txcmd_phys =
             pci_map_single(il->pci_dev, &out_cmd->hdr, len, PCI_DMA_TODEVICE);
-        /* we do not map meta data ... so we can safely access address to
-         * provide to unmap command*/
-        dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
-        dma_unmap_len_set(out_meta, len, len);
-
-        /* Add buffer containing Tx command and MAC(!) header to TFD's
-         * first entry */
-        il->ops->txq_attach_buf_to_tfd(il, txq, txcmd_phys, len, 1, 0);
+        if (unlikely(pci_dma_mapping_error(il->pci_dev, txcmd_phys)))
+                goto drop_unlock;
 
         /* Set up TFD's 2nd entry to point directly to remainder of skb,
          * if any (802.11 null frames have no payload). */
@@ -626,10 +605,34 @@ il3945_tx_skb(struct il_priv *il,
                 phys_addr =
                     pci_map_single(il->pci_dev, skb->data + hdr_len, len,
                                    PCI_DMA_TODEVICE);
+                if (unlikely(pci_dma_mapping_error(il->pci_dev, phys_addr)))
+                        goto drop_unlock;
+        }
+
+        /* Add buffer containing Tx command and MAC(!) header to TFD's
+         * first entry */
+        il->ops->txq_attach_buf_to_tfd(il, txq, txcmd_phys, len, 1, 0);
+        dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
+        dma_unmap_len_set(out_meta, len, len);
+        if (len)
                 il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, len, 0,
                                                U32_PAD(len));
+
+        if (!ieee80211_has_morefrags(hdr->frame_control)) {
+                txq->need_update = 1;
+        } else {
+                wait_write_ptr = 1;
+                txq->need_update = 0;
         }
 
+        il_update_stats(il, true, fc, skb->len);
+
+        D_TX("sequence nr = 0X%x\n", le16_to_cpu(out_cmd->hdr.sequence));
+        D_TX("tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
+        il_print_hex_dump(il, IL_DL_TX, tx_cmd, sizeof(*tx_cmd));
+        il_print_hex_dump(il, IL_DL_TX, (u8 *) tx_cmd->hdr,
+                          ieee80211_hdrlen(fc));
+
         /* Tell device the write idx *just past* this latest filled TFD */
         q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
         il_txq_update_write_ptr(il, txq);
diff --git a/drivers/net/wireless/iwlegacy/4965-mac.c b/drivers/net/wireless/iwlegacy/4965-mac.c
index 835662a449da..7941eb3a0166 100644
--- a/drivers/net/wireless/iwlegacy/4965-mac.c
+++ b/drivers/net/wireless/iwlegacy/4965-mac.c
@@ -1793,8 +1793,7 @@ il4965_tx_skb(struct il_priv *il,
         memcpy(tx_cmd->hdr, hdr, hdr_len);
 
         /* Total # bytes to be transmitted */
-        len = (u16) skb->len;
-        tx_cmd->len = cpu_to_le16(len);
+        tx_cmd->len = cpu_to_le16((u16) skb->len);
 
         if (info->control.hw_key)
                 il4965_tx_cmd_build_hwcrypto(il, info, tx_cmd, skb, sta_id);
@@ -1804,7 +1803,6 @@ il4965_tx_skb(struct il_priv *il,
 
         il4965_tx_cmd_build_rate(il, tx_cmd, info, sta, fc);
 
-        il_update_stats(il, true, fc, len);
         /*
          * Use the first empty entry in this queue's command buffer array
          * to contain the Tx command and MAC header concatenated together
@@ -1826,18 +1824,8 @@ il4965_tx_skb(struct il_priv *il,
         txcmd_phys =
             pci_map_single(il->pci_dev, &out_cmd->hdr, firstlen,
                            PCI_DMA_BIDIRECTIONAL);
-        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 */
-        il->ops->txq_attach_buf_to_tfd(il, txq, txcmd_phys, firstlen, 1, 0);
-
-        if (!ieee80211_has_morefrags(hdr->frame_control)) {
-                txq->need_update = 1;
-        } else {
-                wait_write_ptr = 1;
-                txq->need_update = 0;
-        }
+        if (unlikely(pci_dma_mapping_error(il->pci_dev, txcmd_phys)))
+                goto drop_unlock;
 
         /* Set up TFD's 2nd entry to point directly to remainder of skb,
          * if any (802.11 null frames have no payload). */
@@ -1846,8 +1834,24 @@ il4965_tx_skb(struct il_priv *il,
                 phys_addr =
                     pci_map_single(il->pci_dev, skb->data + hdr_len, secondlen,
                                    PCI_DMA_TODEVICE);
+                if (unlikely(pci_dma_mapping_error(il->pci_dev, phys_addr)))
+                        goto drop_unlock;
+        }
+
+        /* Add buffer containing Tx command and MAC(!) header to TFD's
+         * first entry */
+        il->ops->txq_attach_buf_to_tfd(il, txq, txcmd_phys, firstlen, 1, 0);
+        dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
+        dma_unmap_len_set(out_meta, len, firstlen);
+        if (secondlen)
                 il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, secondlen,
                                                0, 0);
+
+        if (!ieee80211_has_morefrags(hdr->frame_control)) {
+                txq->need_update = 1;
+        } else {
+                wait_write_ptr = 1;
+                txq->need_update = 0;
         }
 
         scratch_phys =
@@ -1860,6 +1864,8 @@ il4965_tx_skb(struct il_priv *il,
         tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
         tx_cmd->dram_msb_ptr = il_get_dma_hi_addr(scratch_phys);
 
+        il_update_stats(il, true, fc, skb->len);
+
         D_TX("sequence nr = 0X%x\n", le16_to_cpu(out_cmd->hdr.sequence));
         D_TX("tx_flags = 0X%x\n", le32_to_cpu(tx_cmd->tx_flags));
         il_print_hex_dump(il, IL_DL_TX, (u8 *) tx_cmd, sizeof(*tx_cmd));
diff --git a/drivers/net/wireless/iwlegacy/common.c b/drivers/net/wireless/iwlegacy/common.c
index 1f598604a79c..4ed2949f314d 100644
--- a/drivers/net/wireless/iwlegacy/common.c
+++ b/drivers/net/wireless/iwlegacy/common.c
@@ -3162,18 +3162,23 @@ il_enqueue_hcmd(struct il_priv *il, struct il_host_cmd *cmd)
                      idx, il->cmd_queue);
         }
 #endif
-        txq->need_update = 1;
-
-        if (il->ops->txq_update_byte_cnt_tbl)
-                /* Set up entry in queue's byte count circular buffer */
-                il->ops->txq_update_byte_cnt_tbl(il, txq, 0);
 
         phys_addr =
             pci_map_single(il->pci_dev, &out_cmd->hdr, fix_size,
                            PCI_DMA_BIDIRECTIONAL);
+        if (unlikely(pci_dma_mapping_error(il->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);
 
+        txq->need_update = 1;
+
+        if (il->ops->txq_update_byte_cnt_tbl)
+                /* Set up entry in queue's byte count circular buffer */
+                il->ops->txq_update_byte_cnt_tbl(il, txq, 0);
+
         il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, fix_size, 1,
                                             U32_PAD(cmd->len));
 
@@ -3181,6 +3186,7 @@ il_enqueue_hcmd(struct il_priv *il, struct il_host_cmd *cmd)
         q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
         il_txq_update_write_ptr(il, txq);
 
+out:
         spin_unlock_irqrestore(&il->hcmd_lock, flags);
         return idx;
 }