diff options
| author | Tyrel Datwyler <tyreld@linux.vnet.ibm.com> | 2018-12-31 15:43:01 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-09 16:16:39 +0100 |
| commit | b3ebeeb7efe0672e42b1b209fb22dbea69b7a8b9 (patch) | |
| tree | 517a39fd293245e52a3d87ddd1adfdc0b4391890 /drivers/net | |
| parent | c39b8fd4997bf99503b8e48d8cb0eedb1d9a54f0 (diff) | |
ibmveth: fix DMA unmap error in ibmveth_xmit_start error path
[ Upstream commit 756af9c642329d54f048bac2a62f829b391f6944 ]
Commit 33a48ab105a7 ("ibmveth: Fix DMA unmap error") fixed an issue in the
normal code path of ibmveth_xmit_start() that was originally introduced by
Commit 6e8ab30ec677 ("ibmveth: Add scatter-gather support"). This original
fix missed the error path where dma_unmap_page is wrongly called on the
header portion in descs[0] which was mapped with dma_map_single. As a
result a failure to DMA map any of the frags results in a dmesg warning
when CONFIG_DMA_API_DEBUG is enabled.
------------[ cut here ]------------
DMA-API: ibmveth 30000002: device driver frees DMA memory with wrong function
[device address=0x000000000a430000] [size=172 bytes] [mapped as page] [unmapped as single]
WARNING: CPU: 1 PID: 8426 at kernel/dma/debug.c:1085 check_unmap+0x4fc/0xe10
...
<snip>
...
DMA-API: Mapped at:
ibmveth_start_xmit+0x30c/0xb60
dev_hard_start_xmit+0x100/0x450
sch_direct_xmit+0x224/0x490
__qdisc_run+0x20c/0x980
__dev_queue_xmit+0x1bc/0xf20
This fixes the API misuse by unampping descs[0] with dma_unmap_single.
Fixes: 6e8ab30ec677 ("ibmveth: Add scatter-gather support")
Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/ibm/ibmveth.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c index b375ae9f98ef..4996228fd7e6 100644 --- a/drivers/net/ethernet/ibm/ibmveth.c +++ b/drivers/net/ethernet/ibm/ibmveth.c @@ -1162,11 +1162,15 @@ out: map_failed_frags: last = i+1; - for (i = 0; i < last; i++) + for (i = 1; i < last; i++) dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address, descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK, DMA_TO_DEVICE); + dma_unmap_single(&adapter->vdev->dev, + descs[0].fields.address, + descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK, + DMA_TO_DEVICE); map_failed: if (!firmware_has_feature(FW_FEATURE_CMO)) netdev_err(netdev, "tx: unable to map xmit buffer\n"); |