diff options
author | Philip J Kelleher <pjk1939@linux.vnet.ibm.com> | 2013-09-04 18:59:02 (GMT) |
---|---|---|
committer | Jens Axboe <axboe@kernel.dk> | 2013-11-08 16:10:28 (GMT) |
commit | e5feab229f199dadee91073fbef5b507046086fd (patch) | |
tree | a5a5f75cd2ad53ecda8a9e2b3e95046e119be148 /drivers/block/rsxx/dma.c | |
parent | ef7e7c82e02b602f29c2b87f42dcd6143a6777da (diff) | |
download | linux-e5feab229f199dadee91073fbef5b507046086fd.tar.xz |
rsxx: Handling failed pci_map_page on PowerPC and double free.
The rsxx driver was not checking the correct value during a
pci_map_page failure. Fixing this also uncovered a
double free if the bio was returned before it was
broken up into indiviadual 4k dmas, that is also
fixed here.
Signed-off-by: Philip J Kelleher <pjk1939@linux.vnet.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/rsxx/dma.c')
-rw-r--r-- | drivers/block/rsxx/dma.c | 47 |
1 files changed, 27 insertions, 20 deletions
diff --git a/drivers/block/rsxx/dma.c b/drivers/block/rsxx/dma.c index bed32f1..71d1ca2 100644 --- a/drivers/block/rsxx/dma.c +++ b/drivers/block/rsxx/dma.c @@ -221,6 +221,19 @@ static void dma_intr_coal_auto_tune(struct rsxx_cardinfo *card) } /*----------------- RSXX DMA Handling -------------------*/ +static void rsxx_free_dma(struct rsxx_dma_ctrl *ctrl, struct rsxx_dma *dma) +{ + if (!pci_dma_mapping_error(ctrl->card->dev, dma->dma_addr)) { + pci_unmap_page(ctrl->card->dev, dma->dma_addr, + get_dma_size(dma), + dma->cmd == HW_CMD_BLK_WRITE ? + PCI_DMA_TODEVICE : + PCI_DMA_FROMDEVICE); + } + + kmem_cache_free(rsxx_dma_pool, dma); +} + static void rsxx_complete_dma(struct rsxx_dma_ctrl *ctrl, struct rsxx_dma *dma, unsigned int status) @@ -232,21 +245,14 @@ static void rsxx_complete_dma(struct rsxx_dma_ctrl *ctrl, if (status & DMA_CANCELLED) ctrl->stats.dma_cancelled++; - if (dma->dma_addr) - pci_unmap_page(ctrl->card->dev, dma->dma_addr, - get_dma_size(dma), - dma->cmd == HW_CMD_BLK_WRITE ? - PCI_DMA_TODEVICE : - PCI_DMA_FROMDEVICE); - if (dma->cb) dma->cb(ctrl->card, dma->cb_data, status ? 1 : 0); - kmem_cache_free(rsxx_dma_pool, dma); + rsxx_free_dma(ctrl, dma); } int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl, - struct list_head *q) + struct list_head *q, unsigned int done) { struct rsxx_dma *dma; struct rsxx_dma *tmp; @@ -254,7 +260,10 @@ int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl, list_for_each_entry_safe(dma, tmp, q, list) { list_del(&dma->list); - rsxx_complete_dma(ctrl, dma, DMA_CANCELLED); + if (done & COMPLETE_DMA) + rsxx_complete_dma(ctrl, dma, DMA_CANCELLED); + else + rsxx_free_dma(ctrl, dma); cnt++; } @@ -370,7 +379,7 @@ static void dma_engine_stalled(unsigned long data) /* Clean up the DMA queue */ spin_lock(&ctrl->queue_lock); - cnt = rsxx_cleanup_dma_queue(ctrl, &ctrl->queue); + cnt = rsxx_cleanup_dma_queue(ctrl, &ctrl->queue, COMPLETE_DMA); spin_unlock(&ctrl->queue_lock); cnt += rsxx_dma_cancel(ctrl); @@ -623,7 +632,7 @@ static int rsxx_queue_dma(struct rsxx_cardinfo *card, dma->dma_addr = pci_map_page(card->dev, page, pg_off, dma_len, dir ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); - if (!dma->dma_addr) { + if (pci_dma_mapping_error(card->dev, dma->dma_addr)) { kmem_cache_free(rsxx_dma_pool, dma); return -ENOMEM; } @@ -736,11 +745,9 @@ int rsxx_dma_queue_bio(struct rsxx_cardinfo *card, return 0; bvec_err: - for (i = 0; i < card->n_targets; i++) { - spin_lock_bh(&card->ctrl[i].queue_lock); - rsxx_cleanup_dma_queue(&card->ctrl[i], &dma_list[i]); - spin_unlock_bh(&card->ctrl[i].queue_lock); - } + for (i = 0; i < card->n_targets; i++) + rsxx_cleanup_dma_queue(&card->ctrl[i], &dma_list[i], + FREE_DMA); return st; } @@ -990,7 +997,7 @@ void rsxx_dma_destroy(struct rsxx_cardinfo *card) /* Clean up the DMA queue */ spin_lock_bh(&ctrl->queue_lock); - rsxx_cleanup_dma_queue(ctrl, &ctrl->queue); + rsxx_cleanup_dma_queue(ctrl, &ctrl->queue, COMPLETE_DMA); spin_unlock_bh(&ctrl->queue_lock); rsxx_dma_cancel(ctrl); @@ -1045,7 +1052,7 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card) card->ctrl[i].e_cnt = 0; list_for_each_entry(dma, &card->ctrl[i].queue, list) { - if (dma->dma_addr) + if (!pci_dma_mapping_error(card->dev, dma->dma_addr)) pci_unmap_page(card->dev, dma->dma_addr, get_dma_size(dma), dma->cmd == HW_CMD_BLK_WRITE ? @@ -1073,7 +1080,7 @@ int rsxx_eeh_remap_dmas(struct rsxx_cardinfo *card) dma->cmd == HW_CMD_BLK_WRITE ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); - if (!dma->dma_addr) { + if (pci_dma_mapping_error(card->dev, dma->dma_addr)) { spin_unlock_bh(&card->ctrl[i].queue_lock); kmem_cache_free(rsxx_dma_pool, dma); return -ENOMEM; |