diff options
author | Vasu Dev <vasu.dev@intel.com> | 2009-02-27 10:54:57 -0800 |
---|---|---|
committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-03-06 15:37:49 -0600 |
commit | bc0e17f691085315ae9303eb5b0883fe16dfe6b1 (patch) | |
tree | 53138e80aec810604d4eca4626e4f8df65376ccc /include | |
parent | a7e84f2b83f17f8f11da34ccef3ba5a862dc0182 (diff) | |
download | linux-3.10-bc0e17f691085315ae9303eb5b0883fe16dfe6b1.tar.gz linux-3.10-bc0e17f691085315ae9303eb5b0883fe16dfe6b1.tar.bz2 linux-3.10-bc0e17f691085315ae9303eb5b0883fe16dfe6b1.zip |
[SCSI] libfc, fcoe: fixed locking issues with lport->lp_mutex around lport->link_status
The fcoe_xmit could call fc_pause in case the pending skb queue len is larger
than FCOE_MAX_QUEUE_DEPTH, the fc_pause was trying to grab lport->lp_muex to
change lport->link_status and that had these issues :-
1. The fcoe_xmit was getting called with bh disabled, thus causing
"BUG: scheduling while atomic" when grabbing lport->lp_muex with bh disabled.
2. fc_linkup and fc_linkdown function calls lport_enter function with
lport->lp_mutex held and these enter function in turn calls fcoe_xmit to send
lport related FC frame, e.g. fc_linkup => fc_lport_enter_flogi to send flogi
req. In this case grabbing the same lport->lp_mutex again in fc_puase from
fcoe_xmit would cause deadlock.
The lport->lp_mutex was used for setting FC_PAUSE in fcoe_xmit path but
FC_PAUSE bit was not used anywhere beside just setting and clear this
bit in lport->link_status, instead used a separate field qfull in fc_lport
to eliminate need for lport->lp_mutex to track pending queue full condition
and in turn avoid above described two locking issues.
Also added check for lp->qfull in fc_fcp_lport_queue_ready to trigger
SCSI_MLQUEUE_HOST_BUSY when lp->qfull is set to prevent more scsi-ml cmds
while lp->qfull is set.
This patch eliminated FC_LINK_UP and FC_PAUSE and instead used dedicated
fields in fc_lport for this, this simplified all related conditional
code.
Also removed fc_pause and fc_unpause functions and instead used newly added
lport->qfull directly in fcoe.
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'include')
-rw-r--r-- | include/scsi/libfc.h | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h index 042f4ade73d..b9e6c1cd891 100644 --- a/include/scsi/libfc.h +++ b/include/scsi/libfc.h @@ -68,9 +68,6 @@ /* * FC HBA status */ -#define FC_PAUSE (1 << 1) -#define FC_LINK_UP (1 << 0) - enum fc_lport_state { LPORT_ST_NONE = 0, LPORT_ST_FLOGI, @@ -603,7 +600,8 @@ struct fc_lport { /* Operational Information */ struct libfc_function_template tt; - u16 link_status; + u8 link_up; + u8 qfull; enum fc_lport_state state; unsigned long boot_time; @@ -704,12 +702,6 @@ void fc_linkup(struct fc_lport *); void fc_linkdown(struct fc_lport *); /* - * Pause and unpause traffic. - */ -void fc_pause(struct fc_lport *); -void fc_unpause(struct fc_lport *); - -/* * Configure the local port. */ int fc_lport_config(struct fc_lport *); |