scsi: ipr: Use sgl_alloc_order() and sgl_free_order()

Use the sgl_alloc_order() and sgl_free_order() functions instead of open
coding these functions.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 8a739b7..7e3f6e3 100644 (file)
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1059,6 +1059,7 @@ config SCSI_IPR
        depends on PCI && SCSI && ATA
        select FW_LOADER
        select IRQ_POLL
+       select SGL_ALLOC
        ---help---
          This driver supports the IBM Power Linux family RAID adapters.
          This includes IBM pSeries 5712, 5703, 5709, and 570A, as well

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index e07dd99..5273516 100644 (file)
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -3816,10 +3816,8 @@ static struct device_attribute ipr_iopoll_weight_attr = {
  **/
 static struct ipr_sglist *ipr_alloc_ucode_buffer(int buf_len)
 {
-       int sg_size, order, bsize_elem, num_elem, i, j;
+       int sg_size, order;
        struct ipr_sglist *sglist;
-       struct scatterlist *scatterlist;
-       struct page *page;
 
        /* Get the minimum size per scatter/gather element */
        sg_size = buf_len / (IPR_MAX_SGLIST - 1);
@@ -3827,45 +3825,18 @@ static struct ipr_sglist *ipr_alloc_ucode_buffer(int buf_len)
        /* Get the actual size per element */
        order = get_order(sg_size);
 
-       /* Determine the actual number of bytes per element */
-       bsize_elem = PAGE_SIZE * (1 << order);
-
-       /* Determine the actual number of sg entries needed */
-       if (buf_len % bsize_elem)
-               num_elem = (buf_len / bsize_elem) + 1;
-       else
-               num_elem = buf_len / bsize_elem;
-
        /* Allocate a scatter/gather list for the DMA */
-       sglist = kzalloc(sizeof(struct ipr_sglist) +
-                        (sizeof(struct scatterlist) * (num_elem - 1)),
-                        GFP_KERNEL);
-
+       sglist = kzalloc(sizeof(struct ipr_sglist), GFP_KERNEL);
        if (sglist == NULL) {
                ipr_trace;
                return NULL;
        }
-
-       scatterlist = sglist->scatterlist;
-       sg_init_table(scatterlist, num_elem);
-
        sglist->order = order;
-       sglist->num_sg = num_elem;
-
-       /* Allocate a bunch of sg elements */
-       for (i = 0; i < num_elem; i++) {
-               page = alloc_pages(GFP_KERNEL, order);
-               if (!page) {
-                       ipr_trace;
-
-                       /* Free up what we already allocated */
-                       for (j = i - 1; j >= 0; j--)
-                               __free_pages(sg_page(&scatterlist[j]), order);
-                       kfree(sglist);
-                       return NULL;
-               }
-
-               sg_set_page(&scatterlist[i], page, 0, 0);
+       sglist->scatterlist = sgl_alloc_order(buf_len, order, false, GFP_KERNEL,
+                                             &sglist->num_sg);
+       if (!sglist->scatterlist) {
+               kfree(sglist);
+               return NULL;
        }
 
        return sglist;
@@ -3883,11 +3854,7 @@ static struct ipr_sglist *ipr_alloc_ucode_buffer(int buf_len)
  **/
 static void ipr_free_ucode_buffer(struct ipr_sglist *sglist)
 {
-       int i;
-
-       for (i = 0; i < sglist->num_sg; i++)
-               __free_pages(sg_page(&sglist->scatterlist[i]), sglist->order);
-
+       sgl_free_order(sglist->scatterlist, sglist->order);
        kfree(sglist);
 }
 

diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h
index c7f0e9e..9357073 100644 (file)
--- a/drivers/scsi/ipr.h
+++ b/drivers/scsi/ipr.h
@@ -1454,7 +1454,7 @@ struct ipr_sglist {
        u32 num_sg;
        u32 num_dma_sg;
        u32 buffer_len;
-       struct scatterlist scatterlist[1];
+       struct scatterlist *scatterlist;
 };
 
 enum ipr_sdt_state {