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| author | Bhanu Gollapudi <bprakash@broadcom.com> | 2011-03-21 18:51:13 -0700 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2011-03-23 12:53:06 -0500 |
| commit | fee787129d4d6a5e967a69ea3dea3e38ba556b3d (patch) | |
| tree | aa81010d8a41fe15eebbca19e7d0e9d970860129 | |
| parent | 2dcb0a61041a003f439bbd38005b6e454c368be0 (diff) | |
| download | blackbird-op-linux-fee787129d4d6a5e967a69ea3dea3e38ba556b3d.tar.gz blackbird-op-linux-fee787129d4d6a5e967a69ea3dea3e38ba556b3d.zip | |
[SCSI] bnx2fc: IO completion not processed due to missed wakeup
Driver does not detect a new CQE (completion queue entry) if a thread receives
the wakup when it is in TASK_RUNNING state. Fix is to set the state to
TASK_INTERRUPTIBLE while holding the fp_work_lock.
Also, Use __set_current_task() since it is now set inside a spinlock with
synchronization.
Two other related optimizations:
1. After we exit the while (!kthread_should_stop()) loop, use
__set_current_state() since synchronization is no longer needed.
2. Remove set_current_state(TASK_RUNNING) after schedule() since it
should always be TASK_RUNNING after schedule().
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
| -rw-r--r-- | drivers/scsi/bnx2fc/bnx2fc_fcoe.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c index 2056890b437a..e2e647509a73 100644 --- a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c +++ b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c @@ -437,17 +437,16 @@ static int bnx2fc_l2_rcv_thread(void *arg) set_current_state(TASK_INTERRUPTIBLE); while (!kthread_should_stop()) { schedule(); - set_current_state(TASK_RUNNING); spin_lock_bh(&bg->fcoe_rx_list.lock); while ((skb = __skb_dequeue(&bg->fcoe_rx_list)) != NULL) { spin_unlock_bh(&bg->fcoe_rx_list.lock); bnx2fc_recv_frame(skb); spin_lock_bh(&bg->fcoe_rx_list.lock); } + __set_current_state(TASK_INTERRUPTIBLE); spin_unlock_bh(&bg->fcoe_rx_list.lock); - set_current_state(TASK_INTERRUPTIBLE); } - set_current_state(TASK_RUNNING); + __set_current_state(TASK_RUNNING); return 0; } @@ -569,7 +568,6 @@ int bnx2fc_percpu_io_thread(void *arg) set_current_state(TASK_INTERRUPTIBLE); while (!kthread_should_stop()) { schedule(); - set_current_state(TASK_RUNNING); spin_lock_bh(&p->fp_work_lock); while (!list_empty(&p->work_list)) { list_splice_init(&p->work_list, &work_list); @@ -583,10 +581,10 @@ int bnx2fc_percpu_io_thread(void *arg) spin_lock_bh(&p->fp_work_lock); } + __set_current_state(TASK_INTERRUPTIBLE); spin_unlock_bh(&p->fp_work_lock); - set_current_state(TASK_INTERRUPTIBLE); } - set_current_state(TASK_RUNNING); + __set_current_state(TASK_RUNNING); return 0; } |
