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author | Tudor Ambarus <tudor.ambarus@microchip.com> | 2021-12-15 13:01:14 +0200 |
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committer | Vinod Koul <vkoul@kernel.org> | 2022-01-05 15:50:04 +0530 |
commit | a61210cae80cac0701d5aca9551466a389717fd2 (patch) | |
tree | 03d7539f5444b57ae60bcecea8be34f44508e7d4 /drivers/dma/at_xdmac.c | |
parent | 912f7c6f7fac273f40e621447cf17d14b50d6e5b (diff) | |
download | linux-stable-a61210cae80cac0701d5aca9551466a389717fd2.tar.gz linux-stable-a61210cae80cac0701d5aca9551466a389717fd2.tar.bz2 linux-stable-a61210cae80cac0701d5aca9551466a389717fd2.zip |
dmaengine: at_xdmac: Remove a level of indentation in at_xdmac_tasklet()
Apart of making the code easier to read, this patch is a prerequisite for
a functional change: tasklets run with interrupts enabled, so we need to
protect atchan->irq_status with spin_lock_irq() otherwise the tasklet can
be interrupted by the IRQ that modifies irq_status. atchan->irq_status
will be protected in a further patch.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20211215110115.191749-12-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/at_xdmac.c')
-rw-r--r-- | drivers/dma/at_xdmac.c | 70 |
1 files changed, 34 insertions, 36 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index abe8c4615e65..ba727751a9f6 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -1667,53 +1667,51 @@ static void at_xdmac_tasklet(struct tasklet_struct *t) { struct at_xdmac_chan *atchan = from_tasklet(atchan, t, tasklet); struct at_xdmac_desc *desc; + struct dma_async_tx_descriptor *txd; u32 error_mask; dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08x\n", __func__, atchan->irq_status); - error_mask = AT_XDMAC_CIS_RBEIS - | AT_XDMAC_CIS_WBEIS - | AT_XDMAC_CIS_ROIS; - - if (at_xdmac_chan_is_cyclic(atchan)) { - at_xdmac_handle_cyclic(atchan); - } else if ((atchan->irq_status & AT_XDMAC_CIS_LIS) - || (atchan->irq_status & error_mask)) { - struct dma_async_tx_descriptor *txd; - - if (atchan->irq_status & error_mask) - at_xdmac_handle_error(atchan); - - spin_lock_irq(&atchan->lock); - desc = list_first_entry(&atchan->xfers_list, - struct at_xdmac_desc, - xfer_node); - dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); - if (!desc->active_xfer) { - dev_err(chan2dev(&atchan->chan), "Xfer not active: exiting"); - spin_unlock_irq(&atchan->lock); - return; - } + if (at_xdmac_chan_is_cyclic(atchan)) + return at_xdmac_handle_cyclic(atchan); - txd = &desc->tx_dma_desc; - dma_cookie_complete(txd); - /* Remove the transfer from the transfer list. */ - list_del(&desc->xfer_node); - spin_unlock_irq(&atchan->lock); + error_mask = AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS | + AT_XDMAC_CIS_ROIS; - if (txd->flags & DMA_PREP_INTERRUPT) - dmaengine_desc_get_callback_invoke(txd, NULL); + if (!(atchan->irq_status & AT_XDMAC_CIS_LIS) && + !(atchan->irq_status & error_mask)) + return; - dma_run_dependencies(txd); + if (atchan->irq_status & error_mask) + at_xdmac_handle_error(atchan); - spin_lock_irq(&atchan->lock); - /* Move the xfer descriptors into the free descriptors list. */ - list_splice_tail_init(&desc->descs_list, - &atchan->free_descs_list); - at_xdmac_advance_work(atchan); + spin_lock_irq(&atchan->lock); + desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, + xfer_node); + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); + if (!desc->active_xfer) { + dev_err(chan2dev(&atchan->chan), "Xfer not active: exiting"); spin_unlock_irq(&atchan->lock); + return; } + + txd = &desc->tx_dma_desc; + dma_cookie_complete(txd); + /* Remove the transfer from the transfer list. */ + list_del(&desc->xfer_node); + spin_unlock_irq(&atchan->lock); + + if (txd->flags & DMA_PREP_INTERRUPT) + dmaengine_desc_get_callback_invoke(txd, NULL); + + dma_run_dependencies(txd); + + spin_lock_irq(&atchan->lock); + /* Move the xfer descriptors into the free descriptors list. */ + list_splice_tail_init(&desc->descs_list, &atchan->free_descs_list); + at_xdmac_advance_work(atchan); + spin_unlock_irq(&atchan->lock); } static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id) |