diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2014-02-27 05:52:58 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-12 03:10:10 +0400 |
| commit | f2da4cebeffec9908b92ecb131b1108c3ef43769 (patch) | |
| tree | 75073b94bbb42f1ebb931030d88ff0fd49c44fc8 /drivers/net/wireless | |
| parent | af720fc6ae76ea10216ede42b48ee0550d65e36f (diff) | |
| download | linux-f2da4cebeffec9908b92ecb131b1108c3ef43769.tar.xz | |
iwlwifi: handle DMA mapping failures
commit 7c34158231b2eda8dcbd297be2bb1559e69cb433 upstream.
The RX replenish code doesn't handle DMA mapping failures,
which will cause issues if there actually is a failure. This
was reported by Shuah Khan who found a DMA mapping framework
warning ("device driver failed to check map error").
Reported-by: Shuah Khan <shuah.khan@hp.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[bwh: Backported to 3.2:
- Adjust filename, context, indentation
- Use bus(trans) instead of trans where necessary
- Use hw_params(trans).rx_page_order instead of trans_pcie->rx_page_order]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
[wujg: Backported to 3.4:
- Adjust context
- Use trans instead of bus(trans)
- Use hw_params(trans).rx_page_order instead of trans_pcie->rx_page_order]
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/wireless')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c index e43f152d1a79..7bcaeaf4d42e 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c @@ -315,6 +315,14 @@ static void iwlagn_rx_allocate(struct iwl_trans *trans, gfp_t priority) rxb->page_dma = dma_map_page(trans->dev, page, 0, PAGE_SIZE << hw_params(trans).rx_page_order, DMA_FROM_DEVICE); + if (dma_mapping_error(trans->dev, rxb->page_dma)) { + rxb->page = NULL; + spin_lock_irqsave(&rxq->lock, flags); + list_add(&rxb->list, &rxq->rx_used); + spin_unlock_irqrestore(&rxq->lock, flags); + __free_pages(page, hw_params(trans).rx_page_order); + return; + } /* dma address must be no more than 36 bits */ BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36)); /* and also 256 byte aligned! */ @@ -450,8 +458,19 @@ static void iwl_rx_handle_rxbuf(struct iwl_trans *trans, dma_map_page(trans->dev, rxb->page, 0, PAGE_SIZE << hw_params(trans).rx_page_order, DMA_FROM_DEVICE); - list_add_tail(&rxb->list, &rxq->rx_free); - rxq->free_count++; + if (dma_mapping_error(trans->dev, rxb->page_dma)) { + /* + * free the page(s) as well to not break + * the invariant that the items on the used + * list have no page(s) + */ + __free_pages(rxb->page, hw_params(trans).rx_page_order); + rxb->page = NULL; + list_add_tail(&rxb->list, &rxq->rx_used); + } else { + list_add_tail(&rxb->list, &rxq->rx_free); + rxq->free_count++; + } } else list_add_tail(&rxb->list, &rxq->rx_used); spin_unlock_irqrestore(&rxq->lock, flags); |