Hello Zhaolei,
The patch cfa3fa405a5e: "Fix debugfs_create_*'s error checking method
for wireless/rt2x00/" from Oct 22, 2008, leads to the following
static checker warning:
drivers/net/wireless/ralink/rt2x00/rt2x00debug.c:674
rt2x00debug_register()
warn: 'intf->driver_entry' isn't an ERR_PTR
drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
651 void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
652 {
653 const struct rt2x00debug *debug = rt2x00dev->ops->debugfs;
654 struct rt2x00debug_intf *intf;
655
656 intf = kzalloc(sizeof(struct rt2x00debug_intf), GFP_KERNEL);
657 if (!intf) {
658 rt2x00_err(rt2x00dev, "Failed to allocate debug
handler\n");
659 return;
660 }
661
662 intf->debug = debug;
663 intf->rt2x00dev = rt2x00dev;
664 rt2x00dev->debugfs_intf = intf;
665
666 intf->driver_folder =
667 debugfs_create_dir(intf->rt2x00dev->ops->name,
668 rt2x00dev->hw->wiphy->debugfsdir);
669 if (IS_ERR(intf->driver_folder) || !intf->driver_folder)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
This code ensures that debugfs is enabled.
670 goto exit;
671
672 intf->driver_entry =
673 rt2x00debug_create_file_driver("driver", intf,
&intf->driver_blob);
674 if (IS_ERR(intf->driver_entry) || !intf->driver_entry)
^^^^^^^^^^^^^^^^^^^^^^^^^^
So there is no need to check again.
rt2x00debug_create_file_driver() is not a raw debugfs call, but
generally the correct thing is that we should not check debugfs
functions for errors. Debugfs functions are designed so that, for
example, if debugfs_create_dir() fails then the files will just be
created in the root directory. You don't need to have error checking
for debugfs_create_dir(), even if it returns null that's handled.
675 goto exit;
676
677 intf->chipset_entry =
678 rt2x00debug_create_file_chipset("chipset",
679 intf, &intf->chipset_blob);
680 if (IS_ERR(intf->chipset_entry) || !intf->chipset_entry)
681 goto exit;
682
683 intf->dev_flags = debugfs_create_file("dev_flags", S_IRUSR,
684 intf->driver_folder, intf,
685
&rt2x00debug_fop_dev_flags);
686 if (IS_ERR(intf->dev_flags) || !intf->dev_flags)
687 goto exit;
688
regards,
dan carpenter
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