Certain drives report that they support QAS, but it some cases can have trouble with it causing bus resets. This patch optionally disables QAS for the MPT Fusion spi driver. QAS is disabled using the mpt_qas module parameter. Andrew Signed-off-by: Andrew Patterson <andrew.patterson@xxxxxx> -- Andrew Patterson Hewlett-Packard Index: scsi-misc-2.6/drivers/message/fusion/mptscsih.h =================================================================== --- scsi-misc-2.6.orig/drivers/message/fusion/mptscsih.h 2006-06-02 12:29:31.000000000 -0600 +++ scsi-misc-2.6/drivers/message/fusion/mptscsih.h 2006-06-02 14:32:07.000000000 -0600 @@ -66,6 +66,7 @@ #define MPTSCSIH_DOMAIN_VALIDATION 1 #define MPTSCSIH_MAX_WIDTH 1 #define MPTSCSIH_MIN_SYNC 0x08 +#define MPTSCSIH_QAS 1 #define MPTSCSIH_SAF_TE 0 #define MPTSCSIH_PT_CLEAR 0 Index: scsi-misc-2.6/drivers/message/fusion/mptspi.c =================================================================== --- scsi-misc-2.6.orig/drivers/message/fusion/mptspi.c 2006-06-02 12:29:31.000000000 -0600 +++ scsi-misc-2.6/drivers/message/fusion/mptspi.c 2006-06-02 14:32:07.000000000 -0600 @@ -87,6 +87,10 @@ static int mpt_pq_filter = 0; module_param(mpt_pq_filter, int, 0); MODULE_PARM_DESC(mpt_pq_filter, " Enable peripheral qualifier filter: enable=1 (default=0)"); +static int mpt_qas = MPTSCSIH_QAS; +module_param(mpt_qas, int, 1); +MODULE_PARM_DESC(mpt_qas, " Quick Arbitration and Selection (QAS) enabled=1, disabled=0 (default=MPTSCSIH_QAS=1)"); + static void mptspi_write_offset(struct scsi_target *, int); static void mptspi_write_width(struct scsi_target *, int); static int mptspi_write_spi_device_pg1(struct scsi_target *, @@ -607,7 +611,8 @@ static void mptspi_write_qas(struct scsi VirtTarget *vtarget = starget->hostdata; u32 nego; - if ((vtarget->negoFlags & MPT_TARGET_NO_NEGO_QAS) || + if (!mpt_qas || + (vtarget->negoFlags & MPT_TARGET_NO_NEGO_QAS) || hd->ioc->spi_data.noQas) spi_qas(starget) = 0; else @@ -989,7 +994,7 @@ mptspi_probe(struct pci_dev *pdev, const ioc->name, mpt_saf_te, mpt_pq_filter)); - ioc->spi_data.noQas = 0; + ioc->spi_data.noQas = mpt_qas ? 0 : MPT_TARGET_NO_NEGO_QAS; init_waitqueue_head(&hd->scandv_waitq); hd->scandv_wait_done = 0; - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
