arcmsr: limit max. number of SCSI command request

This patch limits the max. number of SCSI commmand request to avoid command
overflow.

Signed-off-by: Ching Huang <ching2048@areca.com.tw>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/scsi/arcmsr/arcmsr.h b/drivers/scsi/arcmsr/arcmsr.h
index 1c64b60a3dcf7d507f1648778e117e07423f62a7..0ae0ce31bb46f8367d314db35db114c48b5ece2b 100644 (file)
--- a/drivers/scsi/arcmsr/arcmsr.h
+++ b/drivers/scsi/arcmsr/arcmsr.h
@@ -45,11 +45,12 @@
 #include <linux/interrupt.h>
 struct device_attribute;
 /*The limit of outstanding scsi command that firmware can handle*/
-#define ARCMSR_MAX_OUTSTANDING_CMD                                             256
 #ifdef CONFIG_XEN
        #define ARCMSR_MAX_FREECCB_NUM  160
+#define ARCMSR_MAX_OUTSTANDING_CMD     155
 #else
        #define ARCMSR_MAX_FREECCB_NUM  320
+#define ARCMSR_MAX_OUTSTANDING_CMD     255
 #endif
 #define ARCMSR_DRIVER_VERSION          "v1.30.00.04-20140428"
 #define ARCMSR_SCSI_INITIATOR_ID                                               255
@@ -598,6 +599,7 @@ struct AdapterControlBlock
                                #define FW_DEADLOCK     0x0010
        atomic_t                        rq_map_token;
        atomic_t                        ante_token_value;
+       uint32_t        maxOutstanding;
        int             msix_vector_count;
 };/* HW_DEVICE_EXTENSION */
 /*

diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index b338a3b05549339c526529926a75a2d01460dde5..ed61ee283a61de1b1b7cc71e0e99477b9c818d88 100644 (file)
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -134,7 +134,7 @@ static struct scsi_host_template arcmsr_scsi_host_template = {
        .eh_bus_reset_handler   = arcmsr_bus_reset,
        .bios_param             = arcmsr_bios_param,
        .change_queue_depth     = arcmsr_adjust_disk_queue_depth,
-       .can_queue              = ARCMSR_MAX_FREECCB_NUM,
+       .can_queue              = ARCMSR_MAX_OUTSTANDING_CMD,
        .this_id                        = ARCMSR_SCSI_INITIATOR_ID,
        .sg_tablesize                   = ARCMSR_DEFAULT_SG_ENTRIES, 
        .max_sectors                    = ARCMSR_MAX_XFER_SECTORS_C, 
@@ -693,7 +693,7 @@ static int arcmsr_probe(struct pci_dev *pdev, const struct pci_device_id *id)
        host->max_lun = ARCMSR_MAX_TARGETLUN;
        host->max_id = ARCMSR_MAX_TARGETID;             /*16:8*/
        host->max_cmd_len = 16;                         /*this is issue of 64bit LBA ,over 2T byte*/
-       host->can_queue = ARCMSR_MAX_FREECCB_NUM;       /* max simultaneous cmds */             
+       host->can_queue = ARCMSR_MAX_OUTSTANDING_CMD;
        host->cmd_per_lun = ARCMSR_MAX_CMD_PERLUN;          
        host->this_id = ARCMSR_SCSI_INITIATOR_ID;
        host->unique_id = (bus << 8) | dev_fun;
@@ -2216,9 +2216,6 @@ static int arcmsr_queue_command_lck(struct scsi_cmnd *cmd,
                arcmsr_handle_virtual_command(acb, cmd);
                return 0;
        }
-       if (atomic_read(&acb->ccboutstandingcount) >=
-                       ARCMSR_MAX_OUTSTANDING_CMD)
-               return SCSI_MLQUEUE_HOST_BUSY;
        ccb = arcmsr_get_freeccb(acb);
        if (!ccb)
                return SCSI_MLQUEUE_HOST_BUSY;
@@ -2428,12 +2425,27 @@ static bool arcmsr_get_hbc_config(struct AdapterControlBlock *pACB)
 }
 static bool arcmsr_get_firmware_spec(struct AdapterControlBlock *acb)
 {
-       if (acb->adapter_type == ACB_ADAPTER_TYPE_A)
-               return arcmsr_get_hba_config(acb);
-       else if (acb->adapter_type == ACB_ADAPTER_TYPE_B)
-               return arcmsr_get_hbb_config(acb);
+       bool rtn = false;
+
+       switch (acb->adapter_type) {
+       case ACB_ADAPTER_TYPE_A:
+               rtn = arcmsr_get_hba_config(acb);
+               break;
+       case ACB_ADAPTER_TYPE_B:
+               rtn = arcmsr_get_hbb_config(acb);
+               break;
+       case ACB_ADAPTER_TYPE_C:
+               rtn = arcmsr_get_hbc_config(acb);
+               break;
+       default:
+               break;
+       }
+       if (acb->firm_numbers_queue > ARCMSR_MAX_OUTSTANDING_CMD)
+               acb->maxOutstanding = ARCMSR_MAX_OUTSTANDING_CMD;
        else
-               return arcmsr_get_hbc_config(acb);
+               acb->maxOutstanding = acb->firm_numbers_queue - 1;
+       acb->host->can_queue = acb->maxOutstanding;
+       return rtn;
 }
 
 static int arcmsr_polling_hba_ccbdone(struct AdapterControlBlock *acb,