scsi: qla2xxx: Use local_irq_save_nort() in qla2x00_poll

RT triggers the following:

[   11.307652]  [<ffffffff81077b27>] __might_sleep+0xe7/0x110
[   11.307663]  [<ffffffff8150e524>] rt_spin_lock+0x24/0x60
[   11.307670]  [<ffffffff8150da78>] ? rt_spin_lock_slowunlock+0x78/0x90
[   11.307703]  [<ffffffffa0272d83>] qla24xx_intr_handler+0x63/0x2d0 [qla2xxx]
[   11.307736]  [<ffffffffa0262307>] qla2x00_poll+0x67/0x90 [qla2xxx]

Function qla2x00_poll does local_irq_save() before calling qla24xx_intr_handler
which has a spinlock. Since spinlocks are sleepable on rt, it is not allowed
to call them with interrupts disabled. Therefore we use local_irq_save_nort()
instead which saves flags without disabling interrupts.

This fix needs to be applied to v3.0-rt, v3.2-rt and v3.4-rt

Suggested-by: Thomas Gleixner
Signed-off-by: John Kacur <jkacur@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: David Sommerseth <davids@redhat.com>
Link: http://lkml.kernel.org/r/1335523726-10024-1-git-send-email-jkacur@redhat.com



Signed-off-by: Thomas Gleixner <tglx@linutronix.de>