Even with my workaround... the QLA4xxx driver isn't stable.  The controller seems to die after the server has been up for a few days:

[490752.920691] qla4xxx 0000:05:07.3: scsi(1:0:2:1): ADAPTER RESET ISSUED.
[490752.943274] qla4xxx 0000:05:07.1: scsi(0:0:2:1): ADAPTER RESET ISSUED.
[490782.168479] qla4xxx 0000:05:07.3: HOST RESET FAILED.
[490782.168487] sd 1:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.168491] sd 1:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.168494] sd 1:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.168496] sd 1:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.168550] sd 1:0:2:1: SCSI error: return code = 0x06000000
[490782.168554] end_request: I/O error, dev sdb, sector 268182896
[490782.168558] device-mapper: multipath: Failing path 8:16.
[490782.168600] sd 1:0:2:1: rejecting I/O to offline device
[490782.179202] sd 1:0:2:1: rejecting I/O to offline device
[490782.189793] sd 1:0:2:1: rejecting I/O to offline device
[490782.200394] sd 1:0:2:1: rejecting I/O to offline device
[490782.210985] sd 1:0:2:1: rejecting I/O to offline device
[490782.221572] sd 1:0:2:1: rejecting I/O to offline device
[490782.232163] sd 1:0:2:1: rejecting I/O to offline device
[490782.242754] sd 1:0:2:1: rejecting I/O to offline device
[490782.253387] sd 1:0:2:1: SCSI error: return code = 0x00010000
[490782.253390] end_request: I/O error, dev sdb, sector 34413984
[490782.253473] sd 1:0:2:1: SCSI error: return code = 0x06000000
[490782.253476] end_request: I/O error, dev sdb, sector 268184216
[490782.253555] sd 1:0:2:1: SCSI error: return code = 0x06000000
[490782.253558] end_request: I/O error, dev sdb, sector 268186264
[490782.253624] sd 1:0:2:1: SCSI error: return code = 0x06000000
[490782.253627] end_request: I/O error, dev sdb, sector 268187296
[490782.254018] qla4xxx 0000:05:07.1: HOST RESET FAILED.
[490782.254022] sd 0:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.254027] sd 0:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.254030] sd 0:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.254033] sd 0:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.254035] sd 0:0:2:1: scsi: Device offlined - not ready after error recovery
[490782.254077] sd 0:0:2:1: SCSI error: return code = 0x06000000
[490782.254080] end_request: I/O error, dev sdf, sector 145109696
[490782.254083] device-mapper: multipath: Failing path 8:80.
[490782.254111] sd 0:0:2:1: rejecting I/O to offline device
[490782.264705] sd 0:0:2:1: rejecting I/O to offline device
[490782.275294] sd 0:0:2:1: rejecting I/O to offline device
[490782.285897] sd 0:0:2:1: rejecting I/O to offline device
[490782.296488] sd 0:0:2:1: rejecting I/O to offline device
[490782.307080] sd 0:0:2:1: rejecting I/O to offline device
[490782.317682] sd 0:0:2:1: rejecting I/O to offline device
[490782.328273] sd 0:0:2:1: rejecting I/O to offline device
[490782.338875] sd 0:0:2:1: rejecting I/O to offline device
[490782.349481] sd 0:0:2:1: rejecting I/O to offline device
[490782.360074] sd 0:0:2:1: rejecting I/O to offline device
[490782.370672] sd 0:0:2:1: rejecting I/O to offline device
[490782.381270] sd 0:0:2:1: rejecting I/O to offline device
[490782.391859] sd 0:0:2:1: rejecting I/O to offline device
[490782.402467] sd 0:0:2:1: SCSI error: return code = 0x00010000
[490782.402470] end_request: I/O error, dev sdf, sector 336062128
[490782.402547] sd 0:0:2:1: SCSI error: return code = 0x06000000
[490782.402550] end_request: I/O error, dev sdf, sector 145110720
[490782.402625] sd 0:0:2:1: SCSI error: return code = 0x06000000
[490782.402628] end_request: I/O error, dev sdf, sector 145111744
[490782.402703] sd 0:0:2:1: SCSI error: return code = 0x06000000
[490782.402706] end_request: I/O error, dev sdf, sector 268179824
[490782.402787] sd 0:0:2:1: SCSI error: return code = 0x06000000
[490782.402789] end_request: I/O error, dev sdf, sector 268180848