Messages in this thread |  | | Date | Mon, 29 Oct 2001 12:57:39 -0700 | From | Khalid Aziz <> | Subject | To SCSI driver maintainers: 16-byte CDB support in SCSI interface drivers |
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ac series kernels starting with 2.4.10-ac5 contain a patch that enables SCSI midlayer to send SCSI commands larger than 12 bytes to the interface drivers. Before sending a larger command, midlayer will check the command size against Scsi_Host->max_cmd_len. If Scsi_Host->max_cmd_len is larger than or equal to the command size, the command will be sent to the interface driver else it will be terminated with an error. scsi_register() sets Scsi_Host->max_cmd_len to 12 by default for every interface. If a driver and the interface can support larger commands, the driver should set Scsi_Host->max_cmd_len to the correct value after calling scsi_register(). Please make this change to your driver if you would like to support larger SCSI commands. Non-ac kernels will not be affected by this change since Scsi_Host->max_cmd_len is unused on those kernels.
-- Khalid
==================================================================== Khalid Aziz Linux Systems Operation R&D (970)898-9214 Hewlett-Packard khalid@fc.hp.com Fort Collins, CO - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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