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Ignore USB keyboard driver calls from critical sections.

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Reported by:	Oliver Pinter <oliver.pntr@gmail.com>
MFC after:	1 week
This commit is contained in:
Hans Petter Selasky 2014-03-10 08:52:30 +00:00
parent bbd4b4346c
commit cdea3bef22
1 changed files with 6 additions and 0 deletions
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6
sys/dev/usb/input/ukbd.c
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@ -1908,6 +1908,12 @@ ukbd_ioctl(keyboard_t *kbd, u_long cmd, caddr_t arg)
{
int result;
/*
* XXX Check of someone is calling us from a critical section:
*/
if (curthread->td_critnest != 0)
return (EDEADLK);
/*
* XXX KDGKBSTATE, KDSKBSTATE and KDSETLED can be called from any
* context where printf(9) can be called, which among other things