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| author | mdr@sgi.com <mdr@sgi.com> | 2006-05-01 13:07:04 -0500 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.il.steeleye.com> | 2006-05-10 09:54:42 -0500 |
| commit | 6dd727da92290193d0f74fa39f3ad53f423524db (patch) | |
| tree | 156b847c2d65ab8679ab6805256244e5cf80805f /drivers | |
| parent | 0b18ac42aa036c7fa217f178aa6a02c66e19e0a1 (diff) | |
| download | linux-3.10-6dd727da92290193d0f74fa39f3ad53f423524db.tar.gz linux-3.10-6dd727da92290193d0f74fa39f3ad53f423524db.tar.bz2 linux-3.10-6dd727da92290193d0f74fa39f3ad53f423524db.zip | |
[SCSI] mptfc: race between mptfc_register_dev and mptfc_target_alloc
A race condition exists in mptfc between the thread registering a device
with the fc transport and the scan work generated by the transport.
This race existed prior to the application of the mptfc bug fix patch.
mptfc_register_dev() calls fc_remote_port_add() with the FC_RPORT_ROLE_TARGET
bit set in the rport ids passed to the function. Having this bit set causes
fc_remote_port_add() to schedule a scan of the device.
This scan can execute before mptfc_register_dev() can fill in the dd_data
in the rport structure. When this happens, mptfc_target_alloc() will fail
because dd_data is null.
Attached is a patch which fixes the problem. The patch changes the rport ids
passed to fc_remote_port_add() to not have the TARGET bit set. This prevents
the scan from being scheduled. After mptfc_register_dev() fills in the rport
dd_data field, fc_remote_port_rolechg() is called, changing the role of the
rport to TARGET. Thus, the scan is scheduled after dd_data is filled
in which prevents the failure in mptfc_target_alloc().
Signed-off-by: Michael Reed <mdr@sgi.com>
Signed-off-by: Eric Moore <Eric.Moore@lsil.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/message/fusion/mptfc.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/message/fusion/mptfc.c b/drivers/message/fusion/mptfc.c index e1fb5a16636..856487741ef 100644 --- a/drivers/message/fusion/mptfc.c +++ b/drivers/message/fusion/mptfc.c @@ -341,9 +341,6 @@ mptfc_generate_rport_ids(FCDevicePage0_t *pg0, struct fc_rport_identifiers *rid) rid->port_name = ((u64)pg0->WWPN.High) << 32 | (u64)pg0->WWPN.Low; rid->port_id = pg0->PortIdentifier; rid->roles = FC_RPORT_ROLE_UNKNOWN; - rid->roles |= FC_RPORT_ROLE_FCP_TARGET; - if (pg0->Protocol & MPI_FC_DEVICE_PAGE0_PROT_FCP_INITIATOR) - rid->roles |= FC_RPORT_ROLE_FCP_INITIATOR; return 0; } @@ -357,10 +354,15 @@ mptfc_register_dev(MPT_ADAPTER *ioc, int channel, FCDevicePage0_t *pg0) int new_ri = 1; u64 pn, nn; VirtTarget *vtarget; + u32 roles = FC_RPORT_ROLE_UNKNOWN; if (mptfc_generate_rport_ids(pg0, &rport_ids) < 0) return; + roles |= FC_RPORT_ROLE_FCP_TARGET; + if (pg0->Protocol & MPI_FC_DEVICE_PAGE0_PROT_FCP_INITIATOR) + roles |= FC_RPORT_ROLE_FCP_INITIATOR; + /* scan list looking for a match */ list_for_each_entry(ri, &ioc->fc_rports, list) { pn = (u64)ri->pg0.WWPN.High << 32 | (u64)ri->pg0.WWPN.Low; @@ -400,8 +402,9 @@ mptfc_register_dev(MPT_ADAPTER *ioc, int channel, FCDevicePage0_t *pg0) vtarget->bus_id = pg0->CurrentBus; } } - /* once dd_data is filled in, commands will issue to hardware */ *((struct mptfc_rport_info **)rport->dd_data) = ri; + /* scan will be scheduled once rport becomes a target */ + fc_remote_port_rolechg(rport,roles); pn = (u64)ri->pg0.WWPN.High << 32 | (u64)ri->pg0.WWPN.Low; nn = (u64)ri->pg0.WWNN.High << 32 | (u64)ri->pg0.WWNN.Low; |