diff options
| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2010-04-19 08:39:39 +0000 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-04-26 16:04:48 +0900 |
| commit | 83515bc7df812555e20cda48614674e2f346f9f5 (patch) | |
| tree | c0ca604767a430ae328c5e44a6e3e0dada89345f /drivers/dma | |
| parent | e3a4317e1d9970c56ba19d29393e4289809a1aa5 (diff) | |
| download | linux-stable-83515bc7df812555e20cda48614674e2f346f9f5.tar.gz linux-stable-83515bc7df812555e20cda48614674e2f346f9f5.tar.bz2 linux-stable-83515bc7df812555e20cda48614674e2f346f9f5.zip | |
SH: fix error paths in DMA driver
If channel allocation is failing, mark the channel unused and give PM a chance
to power down the hardware.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/shdma.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c index 7cc31b3f40d8..6f25a20de99f 100644 --- a/drivers/dma/shdma.c +++ b/drivers/dma/shdma.c @@ -290,6 +290,7 @@ static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) struct sh_dmae_chan *sh_chan = to_sh_chan(chan); struct sh_desc *desc; struct sh_dmae_slave *param = chan->private; + int ret; pm_runtime_get_sync(sh_chan->dev); @@ -301,11 +302,15 @@ static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) struct sh_dmae_slave_config *cfg; cfg = sh_dmae_find_slave(sh_chan, param->slave_id); - if (!cfg) - return -EINVAL; + if (!cfg) { + ret = -EINVAL; + goto efindslave; + } - if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) - return -EBUSY; + if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) { + ret = -EBUSY; + goto etestused; + } param->config = cfg; @@ -334,10 +339,20 @@ static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) } spin_unlock_bh(&sh_chan->desc_lock); - if (!sh_chan->descs_allocated) - pm_runtime_put(sh_chan->dev); + if (!sh_chan->descs_allocated) { + ret = -ENOMEM; + goto edescalloc; + } return sh_chan->descs_allocated; + +edescalloc: + if (param) + clear_bit(param->slave_id, sh_dmae_slave_used); +etestused: +efindslave: + pm_runtime_put(sh_chan->dev); + return ret; } /* |