dmaengine: cppi41: More PM runtime fixes

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: 740b4be3f742 ("dmaengine: cpp41: Fix handling of error path")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
index 4b52126c13cf..d5ba43a87a68 100644
--- a/drivers/dma/cppi41.c
+++ b/drivers/dma/cppi41.c
@@ -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 @@ err_chans:
         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);