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>
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index 7cc31b3..6f25a20 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -290,6 +290,7 @@
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 @@
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 @@
}
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;
}
/*