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cfg80211: fix wdev tracing crash

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Arend reported a crash in tracing if the driver returns an
ERR_PTR() value from the add_virtual_intf() callback. This
is due to the tracing then still attempting to dereference
the "pointer", fix this by using IS_ERR_OR_NULL().

Reported-by: Arend van Spriel <arend@broadcom.com>
Tested-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2013-03-19 20:26:57 +01:00
parent 07e5a5f5ab
commit ce1eadda6b
1 changed files with 2 additions and 1 deletions
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3
net/wireless/trace.h
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@ -27,7 +27,8 @@
#define WIPHY_PR_ARG __entry->wiphy_name
#define WDEV_ENTRY __field(u32, id)
#define WDEV_ASSIGN (__entry->id) = (wdev ? wdev->identifier : 0)
#define WDEV_ASSIGN (__entry->id) = (!IS_ERR_OR_NULL(wdev) \
? wdev->identifier : 0)
#define WDEV_PR_FMT "wdev(%u)"
#define WDEV_PR_ARG (__entry->id)