diff options
| author | Magnus Damm <damm@opensource.se> | 2011-05-24 14:31:20 +0400 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2011-05-25 06:36:15 +0400 |
| commit | 300e5f97d2a32196cbe03104cd6ffe2af97d9338 (patch) | |
| tree | 1863d889aa757365d321e5b6a48db3c92979ac79 /drivers/dma | |
| parent | 26fc02ab5551349b2e593829a76cb44328ee7f61 (diff) | |
| download | linux-300e5f97d2a32196cbe03104cd6ffe2af97d9338.tar.xz | |
dmaengine: shdma: Fix SH_DMAC_MAX_CHANNELS handling
Fix the shdma.c handing of SH_DMAC_MAX_CHANNELS
to avoid overwriting the chan_irq[] and chan_flag[]
arrays in the case of pdata->channel_num is larger
than SH_DMAC_MAX_CHANNELS.
With this patch applied up to SH_DMAC_MAX_CHANNELS
will be used by the shdma.c driver. If more channels
are available in the platform data the user will
be notified on the console.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/shdma.c | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c index 3391b157d057..636e40925b16 100644 --- a/drivers/dma/shdma.c +++ b/drivers/dma/shdma.c @@ -1083,7 +1083,7 @@ static int __init sh_dmae_probe(struct platform_device *pdev) unsigned long irqflags = IRQF_DISABLED, chan_flag[SH_DMAC_MAX_CHANNELS] = {}; int errirq, chan_irq[SH_DMAC_MAX_CHANNELS]; - int err, i, irq_cnt = 0, irqres = 0; + int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; struct sh_dmae_device *shdev; struct resource *chan, *dmars, *errirq_res, *chanirq_res; @@ -1208,8 +1208,13 @@ static int __init sh_dmae_probe(struct platform_device *pdev) !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { /* Special case - all multiplexed */ for (; irq_cnt < pdata->channel_num; irq_cnt++) { - chan_irq[irq_cnt] = chanirq_res->start; - chan_flag[irq_cnt] = IRQF_SHARED; + if (irq_cnt < SH_DMAC_MAX_CHANNELS) { + chan_irq[irq_cnt] = chanirq_res->start; + chan_flag[irq_cnt] = IRQF_SHARED; + } else { + irq_cap = 1; + break; + } } } else { do { @@ -1223,22 +1228,32 @@ static int __init sh_dmae_probe(struct platform_device *pdev) "Found IRQ %d for channel %d\n", i, irq_cnt); chan_irq[irq_cnt++] = i; + + if (irq_cnt >= SH_DMAC_MAX_CHANNELS) + break; + } + + if (irq_cnt >= SH_DMAC_MAX_CHANNELS) { + irq_cap = 1; + break; } chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, ++irqres); } while (irq_cnt < pdata->channel_num && chanirq_res); } - if (irq_cnt < pdata->channel_num) - goto eirqres; - /* Create DMA Channel */ - for (i = 0; i < pdata->channel_num; i++) { + for (i = 0; i < irq_cnt; i++) { err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]); if (err) goto chan_probe_err; } + if (irq_cap) + dev_notice(&pdev->dev, "Attempting to register %d DMA " + "channels when a maximum of %d are supported.\n", + pdata->channel_num, SH_DMAC_MAX_CHANNELS); + pm_runtime_put(&pdev->dev); platform_set_drvdata(pdev, shdev); @@ -1248,7 +1263,7 @@ static int __init sh_dmae_probe(struct platform_device *pdev) chan_probe_err: sh_dmae_chan_remove(shdev); -eirqres: + #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) free_irq(errirq, shdev); eirq_err: |