diff options
author | Alex Smith <alex.smith@imgtec.com> | 2015-07-24 17:24:22 +0100 |
---|---|---|
committer | Vinod Koul <vinod.koul@intel.com> | 2015-08-18 22:28:49 +0530 |
commit | 839896ef3fdacf3a27460b6f6dabc6ac1475a00c (patch) | |
tree | a8e2c9dbdf9187c39253b9b1822415f47095c8a9 | |
parent | dc578f314e2471ca93a4c1f80988ecc781836f72 (diff) | |
download | linux-839896ef3fdacf3a27460b6f6dabc6ac1475a00c.tar.gz linux-839896ef3fdacf3a27460b6f6dabc6ac1475a00c.tar.bz2 linux-839896ef3fdacf3a27460b6f6dabc6ac1475a00c.zip |
dmaengine: jz4780: Fix error handling/signedness issues
There are a some signedness bugs such as testing for < 0 on unsigned
return values. Additionally there are some cases where functions which
should return NULL on error actually return a PTR_ERR value which can
result in oopses on error. Fix these issues.
Signed-off-by: Alex Smith <alex.smith@imgtec.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Cc: dmaengine@vger.kernel.org
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
-rw-r--r-- | drivers/dma/dma-jz4780.c | 33 |
1 files changed, 17 insertions, 16 deletions
diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c index 7af886fc47af..e4a291c67e2a 100644 --- a/drivers/dma/dma-jz4780.c +++ b/drivers/dma/dma-jz4780.c @@ -250,7 +250,7 @@ static uint32_t jz4780_dma_transfer_size(unsigned long val, uint32_t *shift) } } -static uint32_t jz4780_dma_setup_hwdesc(struct jz4780_dma_chan *jzchan, +static int jz4780_dma_setup_hwdesc(struct jz4780_dma_chan *jzchan, struct jz4780_dma_hwdesc *desc, dma_addr_t addr, size_t len, enum dma_transfer_direction direction) { @@ -301,6 +301,7 @@ static uint32_t jz4780_dma_setup_hwdesc(struct jz4780_dma_chan *jzchan, desc->dcm |= width << JZ_DMA_DCM_DP_SHIFT; desc->dtc = len >> jzchan->transfer_shift; + return 0; } static struct dma_async_tx_descriptor *jz4780_dma_prep_slave_sg( @@ -319,12 +320,11 @@ static struct dma_async_tx_descriptor *jz4780_dma_prep_slave_sg( for (i = 0; i < sg_len; i++) { err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], - sg_dma_address(&sgl[i]), - sg_dma_len(&sgl[i]), - direction); + sg_dma_address(&sgl[i]), + sg_dma_len(&sgl[i]), + direction); if (err < 0) - return ERR_PTR(err); - + return NULL; desc->desc[i].dcm |= JZ_DMA_DCM_TIE; @@ -366,9 +366,9 @@ static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_cyclic( for (i = 0; i < periods; i++) { err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], buf_addr, - period_len, direction); + period_len, direction); if (err < 0) - return ERR_PTR(err); + return NULL; buf_addr += period_len; @@ -417,7 +417,7 @@ struct dma_async_tx_descriptor *jz4780_dma_prep_dma_memcpy( tsz << JZ_DMA_DCM_TSZ_SHIFT | JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_SP_SHIFT | JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_DP_SHIFT; - desc->desc[0].dtc = len >> ord; + desc->desc[0].dtc = len >> jzchan->transfer_shift; return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags); } @@ -580,8 +580,8 @@ static enum dma_status jz4780_dma_tx_status(struct dma_chan *chan, txstate->residue = 0; if (vdesc && jzchan->desc && vdesc == &jzchan->desc->vdesc - && jzchan->desc->status & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT)) - status = DMA_ERROR; + && jzchan->desc->status & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT)) + status = DMA_ERROR; spin_unlock_irqrestore(&jzchan->vchan.lock, flags); return status; @@ -756,17 +756,19 @@ static int jz4780_dma_probe(struct platform_device *pdev) if (IS_ERR(jzdma->base)) return PTR_ERR(jzdma->base); - jzdma->irq = platform_get_irq(pdev, 0); - if (jzdma->irq < 0) { + ret = platform_get_irq(pdev, 0); + if (ret < 0) { dev_err(dev, "failed to get IRQ: %d\n", ret); - return jzdma->irq; + return ret; } + jzdma->irq = ret; + ret = devm_request_irq(dev, jzdma->irq, jz4780_dma_irq_handler, 0, dev_name(dev), jzdma); if (ret) { dev_err(dev, "failed to request IRQ %u!\n", jzdma->irq); - return -EINVAL; + return ret; } jzdma->clk = devm_clk_get(dev, NULL); @@ -803,7 +805,6 @@ static int jz4780_dma_probe(struct platform_device *pdev) dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; - /* * Enable DMA controller, mark all channels as not programmable. * Also set the FMSC bit - it increases MSC performance, so it makes |