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| author | Alexandre Bounine <alexandre.bounine@idt.com> | 2016-03-22 14:27:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-22 15:36:02 -0700 |
| commit | e680b672a2b47748ee548229242b543a23b902c1 (patch) | |
| tree | b4280e3880b2d130f3b134515d69f6d43e1edc35 /drivers | |
| parent | 83472457505c454592d91807754135d0ad34b125 (diff) | |
| download | linux-e680b672a2b47748ee548229242b543a23b902c1.tar.bz2 | |
rapidio/tsi721_dma: fix synchronization issues
Fix synchronization issues found during testing using multiple DMA
transfer requests to the same channel:
- lost MSI-X interrupt notifications
- non-synchronized attempts to start DMA channel HW resulting in error
message from the driver
- cookie tracking/update race conditions resulting in incorrect DMA
transfer status report
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Reported-by: Barry Wood <barry.wood@idt.com>
Tested-by: Barry Wood <barry.wood@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Cc: Barry Wood <barry.wood@idt.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/rapidio/devices/tsi721_dma.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/drivers/rapidio/devices/tsi721_dma.c b/drivers/rapidio/devices/tsi721_dma.c index 5bc9071ebcae..03637330c482 100644 --- a/drivers/rapidio/devices/tsi721_dma.c +++ b/drivers/rapidio/devices/tsi721_dma.c @@ -84,7 +84,7 @@ static int tsi721_bdma_ch_init(struct tsi721_bdma_chan *bdma_chan, int bd_num) */ bd_ptr = dma_zalloc_coherent(dev, (bd_num + 1) * sizeof(struct tsi721_dma_desc), - &bd_phys, GFP_KERNEL); + &bd_phys, GFP_ATOMIC); if (!bd_ptr) return -ENOMEM; @@ -102,7 +102,7 @@ static int tsi721_bdma_ch_init(struct tsi721_bdma_chan *bdma_chan, int bd_num) sts_size = roundup_pow_of_two(sts_size); sts_ptr = dma_zalloc_coherent(dev, sts_size * sizeof(struct tsi721_dma_sts), - &sts_phys, GFP_KERNEL); + &sts_phys, GFP_ATOMIC); if (!sts_ptr) { /* Free space allocated for DMA descriptors */ dma_free_coherent(dev, @@ -297,7 +297,8 @@ static irqreturn_t tsi721_bdma_msix(int irq, void *ptr) { struct tsi721_bdma_chan *bdma_chan = ptr; - tsi721_bdma_handler(bdma_chan); + if (bdma_chan->active) + tasklet_schedule(&bdma_chan->tasklet); return IRQ_HANDLED; } #endif /* CONFIG_PCI_MSI */ @@ -618,14 +619,14 @@ static void tsi721_dma_tasklet(unsigned long data) } list_add(&desc->desc_node, &bdma_chan->free_list); bdma_chan->active_tx = NULL; + tsi721_advance_work(bdma_chan, NULL); spin_unlock(&bdma_chan->lock); if (callback) callback(param); - spin_lock(&bdma_chan->lock); + } else { + tsi721_advance_work(bdma_chan, bdma_chan->active_tx); + spin_unlock(&bdma_chan->lock); } - - tsi721_advance_work(bdma_chan, bdma_chan->active_tx); - spin_unlock(&bdma_chan->lock); } /* Re-Enable BDMA channel interrupts */ @@ -681,7 +682,7 @@ static int tsi721_alloc_chan_resources(struct dma_chan *dchan) /* Allocate queue of transaction descriptors */ desc = kcalloc(TSI721_DMA_TX_QUEUE_SZ, sizeof(struct tsi721_tx_desc), - GFP_KERNEL); + GFP_ATOMIC); if (!desc) { tsi_err(&dchan->dev->device, "DMAC%d Failed to allocate logical descriptors", @@ -744,7 +745,13 @@ static enum dma_status tsi721_tx_status(struct dma_chan *dchan, dma_cookie_t cookie, struct dma_tx_state *txstate) { - return dma_cookie_status(dchan, cookie, txstate); + struct tsi721_bdma_chan *bdma_chan = to_tsi721_chan(dchan); + enum dma_status status; + + spin_lock_bh(&bdma_chan->lock); + status = dma_cookie_status(dchan, cookie, txstate); + spin_unlock_bh(&bdma_chan->lock); + return status; } static void tsi721_issue_pending(struct dma_chan *dchan) |