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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>
This commit is contained in:
Philip J Kelleher 2013-09-04 13:59:02 -05:00 committed by Jens Axboe
parent ef7e7c82e0
commit e5feab229f
3 changed files with 37 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/block/rsxx/core.c
View File

@ -654,7 +654,8 @@ static void rsxx_eeh_failure(struct pci_dev *dev)
for (i = 0; i < card->n_targets; i++) {
spin_lock_bh(&card->ctrl[i].queue_lock);
cnt = rsxx_cleanup_dma_queue(&card->ctrl[i],
&card->ctrl[i].queue);
&card->ctrl[i].queue,
COMPLETE_DMA);
spin_unlock_bh(&card->ctrl[i].queue_lock);
cnt += rsxx_dma_cancel(&card->ctrl[i]);

47
drivers/block/rsxx/dma.c
View File

@ -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;

9
drivers/block/rsxx/rsxx_priv.h
View File

@ -345,6 +345,11 @@ enum rsxx_creg_stat {
CREG_STAT_TAG_MASK = 0x0000ff00,
};
enum rsxx_dma_finish {
FREE_DMA = 0x0,
COMPLETE_DMA = 0x1,
};
static inline unsigned int CREG_DATA(int N)
{
return CREG_DATA0 + (N << 2);
@ -379,7 +384,9 @@ typedef void (*rsxx_dma_cb)(struct rsxx_cardinfo *card,
int rsxx_dma_setup(struct rsxx_cardinfo *card);
void rsxx_dma_destroy(struct rsxx_cardinfo *card);
int rsxx_dma_init(void);
int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl, struct list_head *q);
int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl,
struct list_head *q,
unsigned int done);
int rsxx_dma_cancel(struct rsxx_dma_ctrl *ctrl);
void rsxx_dma_cleanup(void);
void rsxx_dma_queue_reset(struct rsxx_cardinfo *card);