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>

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 2884b03..d73a768 100644 (file)
--- 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;