tree 76a3c469248217a1d2e1648f749ad93864fe2856
parent 0a765329ed656ef08915c8be4aba9031ba467ee4
author Jeff Dike <jdike@addtoit.com> 1196540190 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1196698397 -0800

uml: work around host tcsetattr bug

Under the conditions that UML uses it, tcgetattr is guaranteed to return
-EINTR when the console is attached to /dev/ptmx, making generic_console_write
hang because it loops, calling tcgetattr until it succeeds.  This is a host
bug - see http://marc.info/?l=linux-kernel&m=119618990807182&w=2 for the
details.

This patch works around it by blocking SIGIO while the terminal attributes are
being fiddled.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>