Author: hselasky
Date: Mon Mar 10 08:52:30 2014
New Revision: 262972
URL: http://svnweb.freebsd.org/changeset/base/262972
Log:
Ignore USB keyboard driver calls from critical sections.
Reported by: Oliver Pinter <oliver.p...@gmail.com>
MFC after: 1 week
Modified:
head/sys/dev/usb/input/ukbd.c
Modified: head/sys/dev/usb/input/ukbd.c
==============================================================================
--- head/sys/dev/usb/input/ukbd.c Mon Mar 10 06:41:48 2014
(r262971)
+++ head/sys/dev/usb/input/ukbd.c Mon Mar 10 08:52:30 2014
(r262972)
@@ -1909,6 +1909,12 @@ ukbd_ioctl(keyboard_t *kbd, u_long cmd,
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
* includes interrupt filters and threads with any kinds of locks
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