diff options
| author | Brian King <brking@linux.vnet.ibm.com> | 2008-12-17 17:19:33 -0600 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-01-02 10:59:57 -0600 |
| commit | 4f10aae0d1a285df6b16bf6ca5abd366140fd371 (patch) | |
| tree | e324caadd488d8e50f64beede6b77fcfc8d0e37b /drivers/scsi | |
| parent | 372bd282900c2d480152622a82942b369b98d49a (diff) | |
[SCSI] ibmvscsi: Make max_requests module parameter more accurate
In a previous patch to fix an issue with error recovery,
the behavior of the max_requests module paramater was also
changed. If, for some reason, max_requests is set to one by
the user, we will end up with a negative number for can_queue.
Fix this by making max_requests not include the two event structs
needed to do error recovery.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvscsi.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index 868d35ea01b..5c541f7850f 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -89,6 +89,7 @@ static int max_id = 64; static int max_channel = 3; static int init_timeout = 5; static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT; +static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2; static struct scsi_transport_template *ibmvscsi_transport_template; @@ -1633,7 +1634,7 @@ static struct scsi_host_template driver_template = { static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev) { /* iu_storage data allocated in initialize_event_pool */ - unsigned long desired_io = max_requests * sizeof(union viosrp_iu); + unsigned long desired_io = max_events * sizeof(union viosrp_iu); /* add io space for sg data */ desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 * @@ -1657,7 +1658,6 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) vdev->dev.driver_data = NULL; - driver_template.can_queue = max_requests - 2; host = scsi_host_alloc(&driver_template, sizeof(*hostdata)); if (!host) { dev_err(&vdev->dev, "couldn't allocate host data\n"); @@ -1673,12 +1673,12 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) atomic_set(&hostdata->request_limit, -1); hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT; - rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_requests); + rc = ibmvscsi_ops->init_crq_queue(&hostdata->queue, hostdata, max_events); if (rc != 0 && rc != H_RESOURCE) { dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc); goto init_crq_failed; } - if (initialize_event_pool(&hostdata->pool, max_requests, hostdata) != 0) { + if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) { dev_err(&vdev->dev, "couldn't initialize event pool\n"); goto init_pool_failed; } @@ -1730,7 +1730,7 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) add_host_failed: release_event_pool(&hostdata->pool, hostdata); init_pool_failed: - ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_requests); + ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, max_events); init_crq_failed: scsi_host_put(host); scsi_host_alloc_failed: @@ -1742,7 +1742,7 @@ static int ibmvscsi_remove(struct vio_dev *vdev) struct ibmvscsi_host_data *hostdata = vdev->dev.driver_data; release_event_pool(&hostdata->pool, hostdata); ibmvscsi_ops->release_crq_queue(&hostdata->queue, hostdata, - max_requests); + max_events); srp_remove_host(hostdata->host); scsi_remove_host(hostdata->host); @@ -1779,6 +1779,10 @@ int __init ibmvscsi_module_init(void) { int ret; + /* Ensure we have two requests to do error recovery */ + driver_template.can_queue = max_requests; + max_events = max_requests + 2; + if (firmware_has_feature(FW_FEATURE_ISERIES)) ibmvscsi_ops = &iseriesvscsi_ops; else if (firmware_has_feature(FW_FEATURE_VIO)) |