提交 7f42ace3 编写于 作者: S Stanislaw Gruszka 提交者: John W. Linville

iwl3945: fix length of dma buffers

commit bdb084b2
Author: Stanislaw Gruszka <sgruszka@redhat.com>
Date:   Wed Feb 13 15:49:08 2013 +0100

    iwlegacy: more checks for dma mapping errors

broke il3945_tx_skb() dma buffer length settings, what results on
firmware errors like showed below and make 3945 device non usable.

iwl3945 0000:02:00.0: Microcode SW error detected. Restarting 0x82000008.
iwl3945 0000:02:00.0: Loaded firmware version: 15.32.2.9
iwl3945 0000:02:00.0: Start IWL Error Log Dump:
iwl3945 0000:02:00.0: Status: 0x000202E4, count: 1
iwl3945 0000:02:00.0: Desc 	Time	   asrtPC blink2 ilink1  nmiPC   Line
iwl3945 0000:02:00.0: SYSASSERT     (0x5) 0000208934 0x008B6 0x0035E 0x00320 0x00000 267
iwl3945 0000:02:00.0: Error Reply type 0x00000001 cmd
Reported-by: NZdenek Kabelac <zkabelac@redhat.com>
Reported-by: NKrzysztof Kolasa <kkolasa@winsoft.pl>
Reported-by: NPedro Francisco <pedrogfrancisco@gmail.com>
Signed-off-by: NStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
上级 8fa48cbd
......@@ -475,6 +475,7 @@ il3945_tx_skb(struct il_priv *il,
dma_addr_t txcmd_phys;
int txq_id = skb_get_queue_mapping(skb);
u16 len, idx, hdr_len;
u16 firstlen, secondlen;
u8 id;
u8 unicast;
u8 sta_id;
......@@ -589,21 +590,22 @@ il3945_tx_skb(struct il_priv *il,
len =
sizeof(struct il3945_tx_cmd) + sizeof(struct il_cmd_header) +
hdr_len;
len = (len + 3) & ~3;
firstlen = (len + 3) & ~3;
/* Physical address of this Tx command's header (not MAC header!),
* within command buffer array. */
txcmd_phys =
pci_map_single(il->pci_dev, &out_cmd->hdr, len, PCI_DMA_TODEVICE);
pci_map_single(il->pci_dev, &out_cmd->hdr, firstlen,
PCI_DMA_TODEVICE);
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). */
len = skb->len - hdr_len;
if (len) {
secondlen = skb->len - hdr_len;
if (secondlen > 0) {
phys_addr =
pci_map_single(il->pci_dev, skb->data + hdr_len, len,
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;
......@@ -611,12 +613,12 @@ il3945_tx_skb(struct il_priv *il,
/* 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);
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, len);
if (len)
il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, len, 0,
U32_PAD(len));
dma_unmap_len_set(out_meta, len, firstlen);
if (secondlen > 0)
il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, secondlen, 0,
U32_PAD(secondlen));
if (!ieee80211_has_morefrags(hdr->frame_control)) {
txq->need_update = 1;
......
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