Patchwork [3/20,V2] drivers/net/can/sja1000/peak_pci.c: fix error return code

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Submitter Peter Senna Tschudin
Date Oct. 5, 2012, 8:41 p.m.
Message ID <1349469667-6137-3-git-send-email-peter.senna@gmail.com>
Download mbox | patch
Permalink /patch/189595/
State Not Applicable
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Comments

Peter Senna Tschudin - Oct. 5, 2012, 8:41 p.m.
From: Peter Senna Tschudin <peter.senna@gmail.com>

The function peak_pci_probe() return 0 for success and negative value
for most of its internal tests failures. There are two exceptions
that are error cases going to failure_*:. Fore this two cases the
function abort its success execution path, but returns non negative
value, making it dificult for a caller function to notice the error.

This patch fixes the error cases that do not return negative values.

This was found by Coccinelle, but the code change was made by hand.
This patch is not robot generated.

A simplified version of the semantic match that finds this problem is
as follows: (http://coccinelle.lip6.fr/)

// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>

---
Change from V1:
	Updated commit message. See: 
	http://www.kernelhub.org/?p=2&msg=139319

 drivers/net/can/sja1000/peak_pci.c |    2 ++
 1 file changed, 2 insertions(+)


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Marc Kleine-Budde - Oct. 5, 2012, 9:06 p.m.
On 10/05/2012 10:41 PM, Peter Senna Tschudin wrote:
> From: Peter Senna Tschudin <peter.senna@gmail.com>
> 
> The function peak_pci_probe() return 0 for success and negative value
> for most of its internal tests failures. There are two exceptions
> that are error cases going to failure_*:. Fore this two cases the
> function abort its success execution path, but returns non negative
> value, making it dificult for a caller function to notice the error.
> 
> This patch fixes the error cases that do not return negative values.
> 
> This was found by Coccinelle, but the code change was made by hand.
> This patch is not robot generated.
> 
> A simplified version of the semantic match that finds this problem is
> as follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> (
> if@p1 (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret@p1 = 0
> )
> ... when != ret = e1
>     when != &ret
> *if(...)
> {
>   ... when != ret = e2
>       when forall
>  return ret;
> }
> // </smpl>
> 
> Signed-off-by: Peter Senna Tschudin <peter.senna@gmail.com>

Too late, v1 of this patch is already in net/master

regards, Marc
David Miller - Oct. 7, 2012, 6:38 p.m.
This patch was already in the tree.

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Patch

diff --git a/drivers/net/can/sja1000/peak_pci.c b/drivers/net/can/sja1000/peak_pci.c
index f0a1296..f5b82ae 100644
--- a/drivers/net/can/sja1000/peak_pci.c
+++ b/drivers/net/can/sja1000/peak_pci.c
@@ -583,12 +583,14 @@  static int __devinit peak_pci_probe(struct pci_dev *pdev,
 	cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
 	if (!cfg_base) {
 		dev_err(&pdev->dev, "failed to map PCI resource #0\n");
+		err = -ENOMEM;
 		goto failure_release_regions;
 	}
 
 	reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
 	if (!reg_base) {
 		dev_err(&pdev->dev, "failed to map PCI resource #1\n");
+		err = -ENOMEM;
 		goto failure_unmap_cfg_base;
 	}