[SCSI] zfcp: Fix deadlock between zfcp ERP and SCSI

[linux-2.6] / drivers / s390 / scsi / zfcp_def.h

diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 8f882690994d9944a947edfbdac794b2a4017680..07b0957b82f308cfbbb5bb25d7d8bb7d9b4466e0 100644 (file)
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -107,6 +107,10 @@ zfcp_address_to_sg(void *address, struct scatterlist *list)
        (ZFCP_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
         /* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
 
+#define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
+        /* max. number of (data buffer) SBALEs in largest SBAL chain
+           multiplied with number of sectors per 4k block */
+
 /* FIXME(tune): free space should be one max. SBAL chain plus what? */
 #define ZFCP_QDIO_PCI_INTERVAL         (QDIO_MAX_BUFFERS_PER_Q \
                                          - (ZFCP_MAX_SBALS_PER_REQ + 4))
@@ -633,6 +637,7 @@ do { \
 #define ZFCP_STATUS_UNIT_SHARED                        0x00000004
 #define ZFCP_STATUS_UNIT_READONLY              0x00000008
 #define ZFCP_STATUS_UNIT_REGISTERED            0x00000010
+#define ZFCP_STATUS_UNIT_SCSI_WORK_PENDING     0x00000020
 
 /* FSF request status (this does not have a common part) */
 #define ZFCP_STATUS_FSFREQ_NOT_INIT            0x00000000
@@ -976,6 +981,10 @@ struct zfcp_unit {
         struct scsi_device     *device;        /* scsi device struct pointer */
        struct zfcp_erp_action erp_action;     /* pending error recovery */
         atomic_t               erp_counter;
+       wait_queue_head_t      scsi_scan_wq;   /* can be used to wait until
+                                                 all scsi_scan_target
+                                                 requests have been
+                                                 completed. */
 };
 
 /* FSF request */
@@ -1028,9 +1037,9 @@ struct zfcp_data {
        wwn_t                   init_wwpn;
        fcp_lun_t               init_fcp_lun;
        char                    *driver_version;
-       kmem_cache_t            *fsf_req_qtcb_cache;
-       kmem_cache_t            *sr_buffer_cache;
-       kmem_cache_t            *gid_pn_cache;
+       struct kmem_cache               *fsf_req_qtcb_cache;
+       struct kmem_cache               *sr_buffer_cache;
+       struct kmem_cache               *gid_pn_cache;
 };
 
 /**