From: Jeff Dike <jdike@addtoit.com>
Date: Sat, 1 Dec 2007 20:16:30 +0000 (-0800)
Subject: uml: work around host tcsetattr bug
X-Git-Tag: v2.6.24-rc4~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce3b642d42f36406112ab474c03d81c5941d9398;p=pandora-kernel.git

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>
---

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