From: Alexander Gordeev Date: Fri, 9 Mar 2012 13:59:59 +0000 (+0100) Subject: genirq: Get rid of unnecessary IRQTF_DIED flag X-Git-Tag: v3.4-rc1~193^2~3 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5234ffb9f74cfa8993d174782bc861dd9b7b5bfb;p=pandora-kernel.git genirq: Get rid of unnecessary IRQTF_DIED flag Currently IRQTF_DIED flag is set when a IRQ thread handler calls do_exit() But also PF_EXITING per process flag gets set when a thread exits. This fix eliminates the duplicate by using PF_EXITING flag. Also, there is a race condition in exit_irq_thread(). In case a thread's bit is cleared in desc->threads_oneshot (and the IRQ line gets unmasked), but before IRQTF_DIED flag is set, a new interrupt might come in and set just cleared bit again, this time forever. This fix throws IRQTF_DIED flag away, eliminating the race as a result. [ tglx: Test THREAD_EXITING first as suggested by Oleg ] Reported-by: Oleg Nesterov Signed-off-by: Alexander Gordeev Link: http://lkml.kernel.org/r/20120309135958.GD2114@dhcp-26-207.brq.redhat.com Signed-off-by: Thomas Gleixner --- Reading git-diff-tree failed