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dmaengine: cppi41: More PM runtime fixes

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Fix use of u32 instead of int for checking for negative errors values
as pointed out by Dan Carpenter <dan.carpenter@oracle.com>.

And while testing the PM runtime error path by randomly returning
failed values in runtime resume, I noticed two more places that need
fixing:

- If pm_runtime_get_sync() fails in probe, we still need to do
  pm_runtime_put_sync() to keep the use count happy. We could call
  pm_runtime_put_noidle() on the error path, but we're just going
  to call pm_runtime_disable() after that so pm_runtime_put_sync()
  will do what we want

- We should print an error if pm_runtime_get_sync() fails in
  cppi41_dma_alloc_chan_resources() so we know where it happens

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 740b4be3f7 ("dmaengine: cpp41: Fix handling of error path")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Tony Lindgren 2016-11-16 10:24:15 -08:00 committed by Vinod Koul
parent 740b4be3f7
commit d5afc1b68a
1 changed files with 7 additions and 4 deletions
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11
drivers/dma/cppi41.c
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@ -317,11 +317,12 @@ static irqreturn_t cppi41_irq(int irq, void *data)
while (val) {
u32 desc, len;
int error;
status = pm_runtime_get(cdd->ddev.dev);
if (status < 0)
error = pm_runtime_get(cdd->ddev.dev);
if (error < 0)
dev_err(cdd->ddev.dev, "%s pm runtime get: %i\n",
__func__, status);
__func__, error);
q_num = __fls(val);
val &= ~(1 << q_num);
@ -367,6 +368,8 @@ static int cppi41_dma_alloc_chan_resources(struct dma_chan *chan)
error = pm_runtime_get_sync(cdd->ddev.dev);
if (error < 0) {
dev_err(cdd->ddev.dev, "%s pm runtime get: %i\n",
__func__, error);
pm_runtime_put_noidle(cdd->ddev.dev);
return error;
@ -1072,8 +1075,8 @@ static int cppi41_dma_probe(struct platform_device *pdev)
deinit_cppi41(dev, cdd);
err_init_cppi:
pm_runtime_dont_use_autosuspend(dev);
pm_runtime_put_sync(dev);
err_get_sync:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
iounmap(cdd->usbss_mem);
iounmap(cdd->ctrl_mem);