Re: [PATCH 1/4 v2] firmware: stratix10-svc: Fix genpool creation error handling

Re: [PATCH 1/4 v2] firmware: stratix10-svc: Fix genpool creation error handling

[Markus Elfring]

> 'svc_create_memory_pool()' returns an error pointer on error, not NULL.

Such information is helpful.


> Fix the corresponding test and return value accordingly.
>
> Move the genpool allocation after a few devm_kzalloc in order to ease
> error handling.

How do you think about a wording variant like the following?

   Change description:
   * Use a check of the failure predicate which is documented for
     the svc_create_memory_pool() function in the same source file.

   * Move the genpool allocation behind a few devm_kzalloc() calls
     in order to ease exception handling.

Regards,
Markus

[PATCH 0/4 v2] firmware: stratix10-svc: Fix some error handling code

[Christophe JAILLET]

This serie was previously sent as a single patch.
After a comment from Dan Carpenter about an error handling path that could be
improved, I've looked deeper at the code and found other issues.

The previous patch corresponds to patch 3/4 in this serie.
This v2 takes Dan's comment into account and fix another resource leak.

Patch 1/4: svc_create_memory_pool returns an error code on error, not NULL 
Patch 2/4: undo a memremap on error path and remove funtion
Patch 3/4: improve error handling in the probe function
Patch 4/4: unrelated clean-up

Christophe JAILLET (4):
  firmware: stratix10-svc: Fix genpool creation error handling
  firmware: stratix10-svc: Unmap some previously memremap'ed memory
  firmware: stratix10-svc: Fix some error handling paths in
    'stratix10_svc_drv_probe()'
  firmware: stratix10-svc: Slighly simplify call

 drivers/firmware/stratix10-svc.c | 42 +++++++++++++++++++-------------
 1 file changed, 25 insertions(+), 17 deletions(-)

-- 
2.25.1

[PATCH 1/4 v2] firmware: stratix10-svc: Fix genpool creation error handling

[Christophe JAILLET]

'svc_create_memory_pool()' returns an error pointer on error, not NULL.
Fix the corresponding test and return value accordingly.

Move the genpool allocation after a few devm_kzalloc in order to ease
error handling.

Fixes: 7ca5ce896524 ("firmware: add Intel Stratix10 service layer driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
 drivers/firmware/stratix10-svc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
index d5f0769f3761..3a176e62754a 100644
--- a/drivers/firmware/stratix10-svc.c
+++ b/drivers/firmware/stratix10-svc.c
@@ -997,10 +997,6 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	genpool = svc_create_memory_pool(pdev, sh_memory);
-	if (!genpool)
-		return -ENOMEM;
-
 	/* allocate service controller and supporting channel */
 	controller = devm_kzalloc(dev, sizeof(*controller), GFP_KERNEL);
 	if (!controller)
@@ -1011,6 +1007,10 @@ static int stratix10_svc_drv_probe(struct platform_device *pdev)
 	if (!chans)
 		return -ENOMEM;
 
+	genpool = svc_create_memory_pool(pdev, sh_memory);
+	if (IS_ERR(genpool))
+		return PTR_ERR(genpool);
+
 	controller->dev = dev;
 	controller->num_chans = SVC_NUM_CHANNEL;
 	controller->num_active_client = 0;
-- 
2.25.1