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| author | Philip J Kelleher <pjk1939@linux.vnet.ibm.com> | 2013-06-18 21:38:26 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-06-19 13:52:09 +0200 |
| commit | 31a70bb4440c963e69ce210389d8119c70b5c39d (patch) | |
| tree | 70bb10af0da9ad240fef12bcd44968142d4bb202 /drivers/block/rsxx/dma.c | |
| parent | rsxx: Restructured DMA cancel scheme. (diff) | |
| download | linux-31a70bb4440c963e69ce210389d8119c70b5c39d.tar.xz linux-31a70bb4440c963e69ce210389d8119c70b5c39d.zip | |
rsxx: Fixes soft-lockup issues during DMAs.
The workqueue mechanism has been reworked to prevent soft
lockup issues from occuring by adding in mutex sychronization.
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 | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/drivers/block/rsxx/dma.c b/drivers/block/rsxx/dma.c index 213e40e4bd92..b485a65b8de1 100644 --- a/drivers/block/rsxx/dma.c +++ b/drivers/block/rsxx/dma.c @@ -381,15 +381,13 @@ static void dma_engine_stalled(unsigned long data) } } -static void rsxx_issue_dmas(struct work_struct *work) +static void rsxx_issue_dmas(struct rsxx_dma_ctrl *ctrl) { - struct rsxx_dma_ctrl *ctrl; struct rsxx_dma *dma; int tag; int cmds_pending = 0; struct hw_cmd *hw_cmd_buf; - ctrl = container_of(work, struct rsxx_dma_ctrl, issue_dma_work); hw_cmd_buf = ctrl->cmd.buf; if (unlikely(ctrl->card->halt) || @@ -469,9 +467,8 @@ static void rsxx_issue_dmas(struct work_struct *work) } } -static void rsxx_dma_done(struct work_struct *work) +static void rsxx_dma_done(struct rsxx_dma_ctrl *ctrl) { - struct rsxx_dma_ctrl *ctrl; struct rsxx_dma *dma; unsigned long flags; u16 count; @@ -479,7 +476,6 @@ static void rsxx_dma_done(struct work_struct *work) u8 tag; struct hw_status *hw_st_buf; - ctrl = container_of(work, struct rsxx_dma_ctrl, dma_done_work); hw_st_buf = ctrl->status.buf; if (unlikely(ctrl->card->halt) || @@ -555,6 +551,28 @@ static void rsxx_dma_done(struct work_struct *work) spin_unlock_bh(&ctrl->queue_lock); } +static void rsxx_schedule_issue(struct work_struct *work) +{ + struct rsxx_dma_ctrl *ctrl; + + ctrl = container_of(work, struct rsxx_dma_ctrl, issue_dma_work); + + mutex_lock(&ctrl->work_lock); + rsxx_issue_dmas(ctrl); + mutex_unlock(&ctrl->work_lock); +} + +static void rsxx_schedule_done(struct work_struct *work) +{ + struct rsxx_dma_ctrl *ctrl; + + ctrl = container_of(work, struct rsxx_dma_ctrl, dma_done_work); + + mutex_lock(&ctrl->work_lock); + rsxx_dma_done(ctrl); + mutex_unlock(&ctrl->work_lock); +} + static int rsxx_queue_discard(struct rsxx_cardinfo *card, struct list_head *q, unsigned int laddr, @@ -789,6 +807,7 @@ static int rsxx_dma_ctrl_init(struct pci_dev *dev, spin_lock_init(&ctrl->trackers->lock); spin_lock_init(&ctrl->queue_lock); + mutex_init(&ctrl->work_lock); INIT_LIST_HEAD(&ctrl->queue); setup_timer(&ctrl->activity_timer, dma_engine_stalled, @@ -802,8 +821,8 @@ static int rsxx_dma_ctrl_init(struct pci_dev *dev, if (!ctrl->done_wq) return -ENOMEM; - INIT_WORK(&ctrl->issue_dma_work, rsxx_issue_dmas); - INIT_WORK(&ctrl->dma_done_work, rsxx_dma_done); + INIT_WORK(&ctrl->issue_dma_work, rsxx_schedule_issue); + INIT_WORK(&ctrl->dma_done_work, rsxx_schedule_done); st = rsxx_hw_buffers_init(dev, ctrl); if (st) |