From: John Kacur <jkacur@xxxxxxxxxx> 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@xxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: David Sommerseth <davids@xxxxxxxxxx> Link: http://lkml.kernel.org/r/1335523726-10024-1-git-send-email-jkacur@xxxxxxxxxx Cc: stable-rt@xxxxxxxxxxxxxxx Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx> --- drivers/scsi/qla2xxx/qla_inline.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h index 4c8167e..e5e99e9 100644 --- a/drivers/scsi/qla2xxx/qla_inline.h +++ b/drivers/scsi/qla2xxx/qla_inline.h @@ -36,12 +36,12 @@ qla2x00_poll(struct rsp_que *rsp) { unsigned long flags; struct qla_hw_data *ha = rsp->hw; - local_irq_save(flags); + local_irq_save_nort(flags); if (IS_QLA82XX(ha)) qla82xx_poll(0, rsp); else ha->isp_ops->intr_handler(0, rsp); - local_irq_restore(flags); + local_irq_restore_nort(flags); } static inline uint8_t * -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
