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authorJulien Brunel <brunel@diku.dk>2008-09-24 18:00:36 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 14:41:02 -0700
commitce5dee50edc8b1ac8028c17040d40a78c4b33232 (patch)
tree67db148cdf739274f7950cfcba0b6be550ea9efb /drivers
parentf0d781d59cb621e1795d510039df973d0f8b23fc (diff)
USB: isp1760: Use an IS_ERR test rather than a NULL test
In case of error, the function isp1760_register returns an ERR pointer, but never returns a NULL pointer. So after a call to this function, a NULL test should be replaced by an IS_ERR test. Moreover, we have noticed that: (1) the result of isp1760_register is assigned through the function pci_set_drvdata without an error test, (2) if the call to isp1760_register fails, the current function (isp1761_pci_probe) returns 0, and if it succeeds, it returns -ENOMEM, which seems odd. Thus, we suggest to move the test before the call to pci_set_drvdata to correct (1), and to turn it into a non IS_ERR test to correct (2). The semantic match that finds this problem is as follows: (http://www.emn.fr/x-info/coccinelle/) // <smpl> @bad_null_test@ expression x,E; statement S1, S2; @@ x = isp1760_register(...) ... when != x = E * if (x == NULL) S1 else S2 // </smpl> Signed-off-by: Julien Brunel <brunel@diku.dk> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/host/isp1760-if.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/host/isp1760-if.c b/drivers/usb/host/isp1760-if.c
index 051ef7b6bdc6..ad44bd60df98 100644
--- a/drivers/usb/host/isp1760-if.c
+++ b/drivers/usb/host/isp1760-if.c
@@ -232,9 +232,10 @@ static int __devinit isp1761_pci_probe(struct pci_dev *dev,
hcd = isp1760_register(pci_mem_phy0, length, dev->irq,
IRQF_SHARED | IRQF_DISABLED, &dev->dev, dev_name(&dev->dev),
devflags);
- pci_set_drvdata(dev, hcd);
- if (!hcd)
+ if (!IS_ERR(hcd)) {
+ pci_set_drvdata(dev, hcd);
return 0;
+ }
clean:
status = -ENODEV;
iounmap(iobase);