| Message ID | 20170616181059.19206-4-hch@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Jun 16, 2017 at 11:10 AM, Christoph Hellwig <hch@lst.de> wrote: > DMA_ERROR_CODE is not a public API and will go away. Instead properly > unwind based on the loop counter. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > Acked-by: Dave Jiang <dave.jiang@intel.com> > Acked-By: Vinod Koul <vinod.koul@intel.com> > --- > drivers/dma/ioat/init.c | 24 +++++++----------------- > 1 file changed, 7 insertions(+), 17 deletions(-) > > diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c > index 6ad4384b3fa8..ed8ed1192775 100644 > --- a/drivers/dma/ioat/init.c > +++ b/drivers/dma/ioat/init.c > @@ -839,8 +839,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) > goto free_resources; > } > > - for (i = 0; i < IOAT_NUM_SRC_TEST; i++) > - dma_srcs[i] = DMA_ERROR_CODE; > for (i = 0; i < IOAT_NUM_SRC_TEST; i++) { > dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE, > DMA_TO_DEVICE); > @@ -910,8 +908,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) > > xor_val_result = 1; > > - for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) > - dma_srcs[i] = DMA_ERROR_CODE; > for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { > dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, > DMA_TO_DEVICE); > @@ -965,8 +961,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) > op = IOAT_OP_XOR_VAL; > > xor_val_result = 0; > - for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) > - dma_srcs[i] = DMA_ERROR_CODE; > for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { > dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, > DMA_TO_DEVICE); > @@ -1017,18 +1011,14 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) > goto free_resources; > dma_unmap: > if (op == IOAT_OP_XOR) { > - if (dest_dma != DMA_ERROR_CODE) > - dma_unmap_page(dev, dest_dma, PAGE_SIZE, > - DMA_FROM_DEVICE); > - for (i = 0; i < IOAT_NUM_SRC_TEST; i++) > - if (dma_srcs[i] != DMA_ERROR_CODE) > - dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, > - DMA_TO_DEVICE); > + while (--i >= 0) > + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, > + DMA_TO_DEVICE); > + dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); > } else if (op == IOAT_OP_XOR_VAL) { > - for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) > - if (dma_srcs[i] != DMA_ERROR_CODE) > - dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, > - DMA_TO_DEVICE); > + while (--i >= 0) > + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, > + DMA_TO_DEVICE); Wouldn't it make more sense to pull out the while loop and just call dma_unmap_page on dest_dma if "op == IOAT_OP_XOR"? Odds are it is what the compiler is already generating and will save a few lines of code so what you end up with is something like: while (--i >= 0) dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE); if (op == IOAT_OP_XOR) dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); > } > free_resources: > dma->device_free_chan_resources(dma_chan); > -- > 2.11.0 >
On Fri, Jun 16, 2017 at 01:40:24PM -0700, Alexander Duyck wrote: > dma_unmap_page on dest_dma if "op == IOAT_OP_XOR"? Odds are it is what > the compiler is already generating and will save a few lines of code > so what you end up with is something like: Honestly wanted to touch the code as little as possible :) If we want to make it prettier and more readable it needs to be refactored. If you're interested I can take a stab at that, but I'd like to keep it out of this already giant series.
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c index 6ad4384b3fa8..ed8ed1192775 100644 --- a/drivers/dma/ioat/init.c +++ b/drivers/dma/ioat/init.c @@ -839,8 +839,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) goto free_resources; } - for (i = 0; i < IOAT_NUM_SRC_TEST; i++) - dma_srcs[i] = DMA_ERROR_CODE; for (i = 0; i < IOAT_NUM_SRC_TEST; i++) { dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE, DMA_TO_DEVICE); @@ -910,8 +908,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) xor_val_result = 1; - for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) - dma_srcs[i] = DMA_ERROR_CODE; for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, DMA_TO_DEVICE); @@ -965,8 +961,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) op = IOAT_OP_XOR_VAL; xor_val_result = 0; - for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) - dma_srcs[i] = DMA_ERROR_CODE; for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, DMA_TO_DEVICE); @@ -1017,18 +1011,14 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma) goto free_resources; dma_unmap: if (op == IOAT_OP_XOR) { - if (dest_dma != DMA_ERROR_CODE) - dma_unmap_page(dev, dest_dma, PAGE_SIZE, - DMA_FROM_DEVICE); - for (i = 0; i < IOAT_NUM_SRC_TEST; i++) - if (dma_srcs[i] != DMA_ERROR_CODE) - dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, - DMA_TO_DEVICE); + while (--i >= 0) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, + DMA_TO_DEVICE); + dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); } else if (op == IOAT_OP_XOR_VAL) { - for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) - if (dma_srcs[i] != DMA_ERROR_CODE) - dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, - DMA_TO_DEVICE); + while (--i >= 0) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, + DMA_TO_DEVICE); } free_resources: dma->device_free_chan_resources(dma_chan);