17 files changed, 144 insertions, 176 deletions
diff --git a/include/asm-ia64/dma-mapping.h b/include/asm-ia64/dma-mapping.h
index 3ca6d5c14b2e..f1735a22d0ea 100644
--- a/include/asm-ia64/dma-mapping.h
+++ b/include/asm-ia64/dma-mapping.h
@@ -6,7 +6,7 @@
 *      David Mosberger-Tang <davidm@hpl.hp.com>
 */
 #include <asm/machvec.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
 #define dma_alloc_coherent      platform_dma_alloc_coherent
 /* coherent mem. is cheap */
diff --git a/include/asm-ia64/scatterlist.h b/include/asm-ia64/scatterlist.h
index a452ea24205a..7d5234d50312 100644
--- a/include/asm-ia64/scatterlist.h
+++ b/include/asm-ia64/scatterlist.h
@@ -30,4 +30,6 @@ struct scatterlist {
 #define sg_dma_len(sg)          ((sg)->dma_length)
 #define sg_dma_address(sg)      ((sg)->dma_address)
+#define ARCH_HAS_SG_CHAIN
 #endif /* _ASM_IA64_SCATTERLIST_H */
diff --git a/include/asm-powerpc/dma-mapping.h b/include/asm-powerpc/dma-mapping.h
index d05891608f74..2af321f36aba 100644
--- a/include/asm-powerpc/dma-mapping.h
+++ b/include/asm-powerpc/dma-mapping.h
@@ -6,149 +6,6 @@
 */
 #ifndef _ASM_DMA_MAPPING_H
 #define _ASM_DMA_MAPPING_H
-#ifdef __KERNEL__
-#include <linux/types.h>
-#include <linux/cache.h>
-/* need struct page definitions */
-#include <linux/mm.h>
-#include <asm/scatterlist.h>
-#include <asm/io.h>
-#define DMA_ERROR_CODE          (~(dma_addr_t)0x0)
-#ifdef CONFIG_NOT_COHERENT_CACHE
-/*
- * DMA-consistent mapping functions for PowerPCs that don't support
- * cache snooping.  These allocate/free a region of uncached mapped
- * memory space for use with DMA devices.  Alternatively, you could
- * allocate the space "normally" and use the cache management functions
- * to ensure it is consistent.
- */
-extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
-extern void __dma_free_coherent(size_t size, void *vaddr);
-extern void __dma_sync(void *vaddr, size_t size, int direction);
-extern void __dma_sync_page(struct page *page, unsigned long offset,
-                                 size_t size, int direction);
-#else /* ! CONFIG_NOT_COHERENT_CACHE */
-/*
- * Cache coherent cores.
- */
-#define __dma_alloc_coherent(gfp, size, handle) NULL
-#define __dma_free_coherent(size, addr)         ((void)0)
-#define __dma_sync(addr, size, rw)              ((void)0)
-#define __dma_sync_page(pg, off, sz, rw)        ((void)0)
-#endif /* ! CONFIG_NOT_COHERENT_CACHE */
-#ifdef CONFIG_PPC64
-/*
- * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
- */
-struct dma_mapping_ops {
-        void *          (*alloc_coherent)(struct device *dev, size_t size,
-                                dma_addr_t *dma_handle, gfp_t flag);
-        void            (*free_coherent)(struct device *dev, size_t size,
-                                void *vaddr, dma_addr_t dma_handle);
-        dma_addr_t      (*map_single)(struct device *dev, void *ptr,
-                                size_t size, enum dma_data_direction direction);
-        void            (*unmap_single)(struct device *dev, dma_addr_t dma_addr,
-                                size_t size, enum dma_data_direction direction);
-        int             (*map_sg)(struct device *dev, struct scatterlist *sg,
-                                int nents, enum dma_data_direction direction);
-        void            (*unmap_sg)(struct device *dev, struct scatterlist *sg,
-                                int nents, enum dma_data_direction direction);
-        int             (*dma_supported)(struct device *dev, u64 mask);
-        int             (*set_dma_mask)(struct device *dev, u64 dma_mask);
-};
-static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
-{
-        /* We don't handle the NULL dev case for ISA for now. We could
-         * do it via an out of line call but it is not needed for now. The
-         * only ISA DMA device we support is the floppy and we have a hack
-         * in the floppy driver directly to get a device for us.
-         */
-        if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
-                return NULL;
-        return dev->archdata.dma_ops;
-}
-static inline int dma_supported(struct device *dev, u64 mask)
-{
-        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-        if (unlikely(dma_ops == NULL))
-                return 0;
-        if (dma_ops->dma_supported == NULL)
-                return 1;
-        return dma_ops->dma_supported(dev, mask);
-}
-static inline int dma_set_mask(struct device *dev, u64 dma_mask)
-{
-        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-        if (unlikely(dma_ops == NULL))
-                return -EIO;
-        if (dma_ops->set_dma_mask != NULL)
-                return dma_ops->set_dma_mask(dev, dma_mask);
-        if (!dev->dma_mask || !dma_supported(dev, dma_mask))
-                return -EIO;
-        *dev->dma_mask = dma_mask;
-        return 0;
-}
-static inline void *dma_alloc_coherent(struct device *dev, size_t size,
-                                       dma_addr_t *dma_handle, gfp_t flag)
-{
-        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-        BUG_ON(!dma_ops);
-        return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
-}
-static inline void dma_free_coherent(struct device *dev, size_t size,
-                                     void *cpu_addr, dma_addr_t dma_handle)
-{
-        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-        BUG_ON(!dma_ops);
-        dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
-}
-static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
-                                        size_t size,
-                                        enum dma_data_direction direction)
-{
-        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-        BUG_ON(!dma_ops);
-        return dma_ops->map_single(dev, cpu_addr, size, direction);
-}
-static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
-                                    size_t size,
-                                    enum dma_data_direction direction)
-{
-        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-        BUG_ON(!dma_ops);
-        dma_ops->unmap_single(dev, dma_addr, size, direction);
-}
-static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
-                                      unsigned long offset, size_t size,
-                                      enum dma_data_direction direction)
-{
-        struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-        BUG_ON(!dma_ops);
-        return dma_ops->map_single(dev, page_address(page) + offset, size,
-                        direction);
-}
 static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
                                  size_t size,
@@ -276,14 +133,15 @@ static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 }
 static inline int
-dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
           enum dma_data_direction direction)
 {
+        struct scatterlist *sg;
        int i;
        BUG_ON(direction == DMA_NONE);
-        for (i = 0; i < nents; i++, sg++) {
+        for_each_sg(sgl, sg, nents, i) {
                BUG_ON(!sg->page);
                __dma_sync_page(sg->page, sg->offset, sg->length, direction);
                sg->dma_address = page_to_bus(sg->page) + sg->offset;
@@ -318,26 +176,28 @@ static inline void dma_sync_single_for_device(struct device *dev,
 }
 static inline void dma_sync_sg_for_cpu(struct device *dev,
-                struct scatterlist *sg, int nents,
+                struct scatterlist *sgl, int nents,
                enum dma_data_direction direction)
 {
+        struct scatterlist *sg;
        int i;
        BUG_ON(direction == DMA_NONE);
-        for (i = 0; i < nents; i++, sg++)
+        for_each_sg(sgl, sg, nents, i)
                __dma_sync_page(sg->page, sg->offset, sg->length, direction);
 }
 static inline void dma_sync_sg_for_device(struct device *dev,
-                struct scatterlist *sg, int nents,
+                struct scatterlist *sgl, int nents,
                enum dma_data_direction direction)
 {
+        struct scatterlist *sg;
        int i;
        BUG_ON(direction == DMA_NONE);
-        for (i = 0; i < nents; i++, sg++)
+        for_each_sg(sgl, sg, nents, i)
                __dma_sync_page(sg->page, sg->offset, sg->length, direction);
 }
diff --git a/include/asm-powerpc/scatterlist.h b/include/asm-powerpc/scatterlist.h
index 8c992d1491d4..b075f619c3b7 100644
--- a/include/asm-powerpc/scatterlist.h
+++ b/include/asm-powerpc/scatterlist.h
@@ -41,5 +41,7 @@ struct scatterlist {
 #define ISA_DMA_THRESHOLD       (~0UL)
 #endif
+#define ARCH_HAS_SG_CHAIN
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_SCATTERLIST_H */
diff --git a/include/asm-sparc/scatterlist.h b/include/asm-sparc/scatterlist.h
index a4fcf9ac9649..4055af90ad7e 100644
--- a/include/asm-sparc/scatterlist.h
+++ b/include/asm-sparc/scatterlist.h
@@ -19,4 +19,6 @@ struct scatterlist {
 #define ISA_DMA_THRESHOLD (~0UL)
+#define ARCH_HAS_SG_CHAIN
 #endif /* !(_SPARC_SCATTERLIST_H) */
diff --git a/include/asm-sparc64/scatterlist.h b/include/asm-sparc64/scatterlist.h
index 048fdb40e81d..703c5bbe6c8c 100644
--- a/include/asm-sparc64/scatterlist.h
+++ b/include/asm-sparc64/scatterlist.h
@@ -20,4 +20,6 @@ struct scatterlist {
 #define ISA_DMA_THRESHOLD       (~0UL)
+#define ARCH_HAS_SG_CHAIN
 #endif /* !(_SPARC64_SCATTERLIST_H) */
diff --git a/include/asm-x86/dma-mapping_32.h b/include/asm-x86/dma-mapping_32.h
index f1d72d177f68..6a2d26cb5da6 100644
--- a/include/asm-x86/dma-mapping_32.h
+++ b/include/asm-x86/dma-mapping_32.h
@@ -2,10 +2,10 @@
 #define _ASM_I386_DMA_MAPPING_H
 #include <linux/mm.h>
+#include <linux/scatterlist.h>
 #include <asm/cache.h>
 #include <asm/io.h>
-#include <asm/scatterlist.h>
 #include <asm/bug.h>
 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
@@ -35,18 +35,19 @@ dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 }
 static inline int
-dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
           enum dma_data_direction direction)
 {
+        struct scatterlist *sg;
        int i;
        BUG_ON(!valid_dma_direction(direction));
-        WARN_ON(nents == 0 || sg[0].length == 0);
+        WARN_ON(nents == 0 || sglist[0].length == 0);
-        for (i = 0; i < nents; i++ ) {
+        for_each_sg(sglist, sg, nents, i) {
-                BUG_ON(!sg[i].page);
+                BUG_ON(!sg->page);
-                sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
+                sg->dma_address = page_to_phys(sg->page) + sg->offset;
        }
        flush_write_buffers();
diff --git a/include/asm-x86/dma-mapping_64.h b/include/asm-x86/dma-mapping_64.h
index 6897e2a436e5..ecd0f6125ba3 100644
--- a/include/asm-x86/dma-mapping_64.h
+++ b/include/asm-x86/dma-mapping_64.h
@@ -6,8 +6,7 @@
 * documentation.
 */
+#include <linux/scatterlist.h>
-#include <asm/scatterlist.h>
 #include <asm/io.h>
 #include <asm/swiotlb.h>
diff --git a/include/asm-x86/scatterlist_32.h b/include/asm-x86/scatterlist_32.h
index d7e45a8f1aae..bd5164aa8f63 100644
--- a/include/asm-x86/scatterlist_32.h
+++ b/include/asm-x86/scatterlist_32.h
@@ -10,6 +10,8 @@ struct scatterlist {
    unsigned int        length;
 };
+#define ARCH_HAS_SG_CHAIN
 /* These macros should be used after a pci_map_sg call has been done
 * to get bus addresses of each of the SG entries and their lengths.
 * You should only work with the number of sg entries pci_map_sg
diff --git a/include/asm-x86/scatterlist_64.h b/include/asm-x86/scatterlist_64.h
index eaf7ada27e14..ef3986ba4b79 100644
--- a/include/asm-x86/scatterlist_64.h
+++ b/include/asm-x86/scatterlist_64.h
@@ -11,6 +11,8 @@ struct scatterlist {
    unsigned int        dma_length;
 };
+#define ARCH_HAS_SG_CHAIN
 #define ISA_DMA_THRESHOLD (0x00ffffff)
 /* These macros should be used after a pci_map_sg call has been done
diff --git a/include/linux/i2o.h b/include/linux/i2o.h
index 9752307d16ba..7da5b98d90e6 100644
--- a/include/linux/i2o.h
+++ b/include/linux/i2o.h
@@ -32,6 +32,7 @@
 #include <linux/workqueue.h>    /* work_struct */
 #include <linux/mempool.h>
 #include <linux/mutex.h>
+#include <linux/scatterlist.h>
 #include <asm/io.h>
 #include <asm/semaphore.h>      /* Needed for MUTEX init macros */
@@ -837,7 +838,7 @@ static inline int i2o_dma_map_sg(struct i2o_controller *c,
                if ((sizeof(dma_addr_t) > 4) && c->pae_support)
                        *mptr++ = cpu_to_le32(i2o_dma_high(sg_dma_address(sg)));
 #endif
-                sg++;
+                sg = sg_next(sg);
        }
        *sg_ptr = mptr;
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 234fa3df24f6..30a1931466a6 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -772,7 +772,7 @@ typedef struct hwif_s {
        unsigned int nsect;
        unsigned int nleft;
-        unsigned int cursg;
+        struct scatterlist *cursg;
        unsigned int cursg_ofs;
        int             rqsize;         /* max sectors per request */
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 229a9ff9f924..377e6d4d9be3 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -29,7 +29,7 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
-#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
 #include <linux/io.h>
 #include <linux/ata.h>
 #include <linux/workqueue.h>
@@ -416,6 +416,7 @@ struct ata_queued_cmd {
        unsigned long           flags;          /* ATA_QCFLAG_xxx */
        unsigned int            tag;
        unsigned int            n_elem;
+        unsigned int            n_iter;
        unsigned int            orig_n_elem;
        int                     dma_dir;
@@ -426,7 +427,7 @@ struct ata_queued_cmd {
        unsigned int            nbytes;
        unsigned int            curbytes;
-        unsigned int            cursg;
+        struct scatterlist      *cursg;
        unsigned int            cursg_ofs;
        struct scatterlist      sgent;
@@ -1043,7 +1044,7 @@ ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
                return 1;
        if (qc->pad_len)
                return 0;
-        if (((sg - qc->__sg) + 1) == qc->n_elem)
+        if (qc->n_iter == qc->n_elem)
                return 1;
        return 0;
 }
@@ -1051,6 +1052,7 @@ ata_sg_is_last(struct scatterlist *sg, struct ata_queued_cmd *qc)
 static inline struct scatterlist *
 ata_qc_first_sg(struct ata_queued_cmd *qc)
 {
+        qc->n_iter = 0;
        if (qc->n_elem)
                return qc->__sg;
        if (qc->pad_len)
@@ -1063,8 +1065,8 @@ ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc)
 {
        if (sg == &qc->pad_sgent)
                return NULL;
-        if (++sg - qc->__sg < qc->n_elem)
+        if (++qc->n_iter < qc->n_elem)
-                return sg;
+                return sg_next(sg);
        if (qc->pad_len)
                return &qc->pad_sgent;
        return NULL;
@@ -1309,9 +1311,11 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
        qc->dma_dir = DMA_NONE;
        qc->__sg = NULL;
        qc->flags = 0;
-        qc->cursg = qc->cursg_ofs = 0;
+        qc->cursg = NULL;
+        qc->cursg_ofs = 0;
        qc->nbytes = qc->curbytes = 0;
        qc->n_elem = 0;
+        qc->n_iter = 0;
        qc->err_mask = 0;
        qc->pad_len = 0;
        qc->sect_size = ATA_SECT_SIZE;
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 4efbd9c445f5..2dc7464cce52 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -20,4 +20,88 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf,
        sg_set_buf(sg, buf, buflen);
 }
+/*
+ * We overload the LSB of the page pointer to indicate whether it's
+ * a valid sg entry, or whether it points to the start of a new scatterlist.
+ * Those low bits are there for everyone! (thanks mason :-)
+ */
+#define sg_is_chain(sg)         ((unsigned long) (sg)->page & 0x01)
+#define sg_chain_ptr(sg)        \
+        ((struct scatterlist *) ((unsigned long) (sg)->page & ~0x01))
+/**
+ * sg_next - return the next scatterlist entry in a list
+ * @sg:         The current sg entry
+ *
+ * Usually the next entry will be @sg@ + 1, but if this sg element is part
+ * of a chained scatterlist, it could jump to the start of a new
+ * scatterlist array.
+ *
+ * Note that the caller must ensure that there are further entries after
+ * the current entry, this function will NOT return NULL for an end-of-list.
+ *
+ */
+static inline struct scatterlist *sg_next(struct scatterlist *sg)
+{
+        sg++;
+        if (unlikely(sg_is_chain(sg)))
+                sg = sg_chain_ptr(sg);
+        return sg;
+}
+/*
+ * Loop over each sg element, following the pointer to a new list if necessary
+ */
+#define for_each_sg(sglist, sg, nr, __i)        \
+        for (__i = 0, sg = (sglist); __i < (nr); __i++, sg = sg_next(sg))
+/**
+ * sg_last - return the last scatterlist entry in a list
+ * @sgl:        First entry in the scatterlist
+ * @nents:      Number of entries in the scatterlist
+ *
+ * Should only be used casually, it (currently) scan the entire list
+ * to get the last entry.
+ *
+ * Note that the @sgl@ pointer passed in need not be the first one,
+ * the important bit is that @nents@ denotes the number of entries that
+ * exist from @sgl@.
+ *
+ */
+static inline struct scatterlist *sg_last(struct scatterlist *sgl,
+                                          unsigned int nents)
+{
+#ifndef ARCH_HAS_SG_CHAIN
+        struct scatterlist *ret = &sgl[nents - 1];
+#else
+        struct scatterlist *sg, *ret = NULL;
+        int i;
+        for_each_sg(sgl, sg, nents, i)
+                ret = sg;
+#endif
+        return ret;
+}
+/**
+ * sg_chain - Chain two sglists together
+ * @prv:        First scatterlist
+ * @prv_nents:  Number of entries in prv
+ * @sgl:        Second scatterlist
+ *
+ * Links @prv@ and @sgl@ together, to form a longer scatterlist.
+ *
+ */
+static inline void sg_chain(struct scatterlist *prv, unsigned int prv_nents,
+                            struct scatterlist *sgl)
+{
+#ifndef ARCH_HAS_SG_CHAIN
+        BUG();
+#endif
+        prv[prv_nents - 1].page = (struct page *) ((unsigned long) sgl | 0x01);
+}
 #endif /* _LINUX_SCATTERLIST_H */
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 9f8f80ab0c8b..702fcfeb37f1 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -11,13 +11,6 @@
 #include <linux/types.h>
 /*
- *      The maximum sg list length SCSI can cope with
- *      (currently must be a power of 2 between 32 and 256)
- */
-#define SCSI_MAX_PHYS_SEGMENTS  MAX_PHYS_SEGMENTS
-/*
 *      SCSI command lengths
 */
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 65ab5145a09b..3f47e522a1ec 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -5,6 +5,7 @@
 #include <linux/list.h>
 #include <linux/types.h>
 #include <linux/timer.h>
+#include <linux/scatterlist.h>
 struct request;
 struct scatterlist;
@@ -68,7 +69,7 @@ struct scsi_cmnd {
        /* These elements define the operation we ultimately want to perform */
        unsigned short use_sg;  /* Number of pieces of scatter-gather */
-        unsigned short sglist_len;      /* size of malloc'd scatter-gather list */
+        unsigned short __use_sg;
        unsigned underflow;     /* Return error if less than
                                   this amount is transferred */
@@ -128,7 +129,7 @@ extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
 extern void scsi_kunmap_atomic_sg(void *virt);
 extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t);
-extern void scsi_free_sgtable(struct scatterlist *, int);
+extern void scsi_free_sgtable(struct scsi_cmnd *);
 extern int scsi_dma_map(struct scsi_cmnd *cmd);
 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
@@ -148,6 +149,6 @@ static inline int scsi_get_resid(struct scsi_cmnd *cmd)
 }
 #define scsi_for_each_sg(cmd, sg, nseg, __i)                    \
-        for (__i = 0, sg = scsi_sglist(cmd); __i < (nseg); __i++, (sg)++)
+        for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
 #endif /* _SCSI_SCSI_CMND_H */
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 7d210cd6c38d..0fd4746ee39d 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -39,6 +39,9 @@ struct blk_queue_tags;
 #define DISABLE_CLUSTERING 0
 #define ENABLE_CLUSTERING 1
+#define DISABLE_SG_CHAINING 0
+#define ENABLE_SG_CHAINING 1
 enum scsi_eh_timer_return {
        EH_NOT_HANDLED,
        EH_HANDLED,
@@ -443,6 +446,15 @@ struct scsi_host_template {
        unsigned ordered_tag:1;
        /*
+         * true if the low-level driver can support sg chaining. this
+         * will be removed eventually when all the drivers are
+         * converted to support sg chaining.
+         *
+         * Status: OBSOLETE
+         */
+        unsigned use_sg_chaining:1;
+        /*
         * Countdown for host blocking with no commands outstanding
         */
        unsigned int max_host_blocked;
@@ -586,6 +598,7 @@ struct Scsi_Host {
        unsigned unchecked_isa_dma:1;
        unsigned use_clustering:1;
        unsigned use_blk_tcq:1;
+        unsigned use_sg_chaining:1;
        /*
         * Host has requested that no further requests come through for the