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| author | Jiri Kosina <jkosina@suse.cz> | 2007-11-30 11:12:58 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2008-01-28 14:51:22 +0100 |
| commit | c4124c9b68bf8ecf1e8afedad3a22e18666cb6f3 (patch) | |
| tree | e94678db134f72037fa61ddf412bdeb98bf88de7 /drivers/hid/hid-core.c | |
| parent | 0887b4cb2102e281c123abf1408f218c15fd3ba3 (diff) | |
| download | lwn-c4124c9b68bf8ecf1e8afedad3a22e18666cb6f3.tar.gz lwn-c4124c9b68bf8ecf1e8afedad3a22e18666cb6f3.zip | |
HID: remove redundant WARN_ON()s in order not to scare users
The WARN_ON() in implement() and extract() spit out stacktraces and
a lot of other information that might make users think that there is
something seriously wrong with the system. WARN_ON() should not be
deliberately triggerable by userspace application, which these can be.
Usually this WARN_ON() triggers when hid2hci utility is sending the
data that don't correspond to the device's report descriptor.
Convert these messages to more friendly printk().
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-core.c')
| -rw-r--r-- | drivers/hid/hid-core.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 2884b036495a..d73a768e176e 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -26,6 +26,7 @@ #include <linux/input.h> #include <linux/wait.h> #include <linux/vmalloc.h> +#include <linux/sched.h> #include <linux/hid.h> #include <linux/hiddev.h> @@ -758,7 +759,9 @@ static __inline__ __u32 extract(__u8 *report, unsigned offset, unsigned n) { u64 x; - WARN_ON(n > 32); + if (n > 32) + printk(KERN_WARNING "HID: extract() called with n (%d) > 32! (%s)\n", + n, current->comm); report += offset >> 3; /* adjust byte index */ offset &= 7; /* now only need bit offset into one byte */ @@ -780,8 +783,13 @@ static __inline__ void implement(__u8 *report, unsigned offset, unsigned n, __u3 __le64 x; u64 m = (1ULL << n) - 1; - WARN_ON(n > 32); + if (n > 32) + printk(KERN_WARNING "HID: implement() called with n (%d) > 32! (%s)\n", + n, current->comm); + if (value > m) + printk(KERN_WARNING "HID: implement() called with too large value %d! (%s)\n", + value, current->comm); WARN_ON(value > m); value &= m; |