From: Stephen Cameron Date: Fri, 23 Jan 2015 22:42:59 +0000 (-0600) Subject: hpsa: reserve some commands for use by driver X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d54c5c24870ff4d581ce17f09d0c5fcb728c1d02;p=linux-beck.git hpsa: reserve some commands for use by driver We need to reserve some commands for device rescans, aborts, and the pass through ioctls, etc. so we cannot give them all to the scsi mid layer. This is in preparation for removing cmd_special_alloc and cmd_special_free so that we can stop queuing commands internally in the driver so that we can remove the locks thta protect the queue that we will no longer have. Reviewed-by: Scott Teel Signed-off-by: Don Brace Signed-off-by: Christoph Hellwig --- diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index bee24b21c1c4..99c32a0ea15b 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -4064,11 +4064,14 @@ static int hpsa_register_scsi(struct ctlr_info *h) sh->max_cmd_len = MAX_COMMAND_SIZE; sh->max_lun = HPSA_MAX_LUN; sh->max_id = HPSA_MAX_LUN; - sh->can_queue = h->nr_cmds; + sh->can_queue = h->nr_cmds - + HPSA_CMDS_RESERVED_FOR_ABORTS - + HPSA_CMDS_RESERVED_FOR_DRIVER - + HPSA_MAX_CONCURRENT_PASSTHRUS; if (h->hba_mode_enabled) sh->cmd_per_lun = 7; else - sh->cmd_per_lun = h->nr_cmds; + sh->cmd_per_lun = sh->can_queue; sh->sg_tablesize = h->maxsgentries; h->scsi_host = sh; sh->hostdata[0] = (unsigned long) h; diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h index 8e06d9e280ec..5ee6c6a73b0c 100644 --- a/drivers/scsi/hpsa.h +++ b/drivers/scsi/hpsa.h @@ -115,6 +115,8 @@ struct ctlr_info { void __iomem *vaddr; unsigned long paddr; int nr_cmds; /* Number of commands allowed on this controller */ +#define HPSA_CMDS_RESERVED_FOR_ABORTS 2 +#define HPSA_CMDS_RESERVED_FOR_DRIVER 1 struct CfgTable __iomem *cfgtable; int interrupts_enabled; int max_commands;