ieee1394: sbp2: stricter dma_sync

Two dma_sync_single_for_cpu() were called in the wrong place.
Luckily they were merely for DMA_TO_DEVICE, hence nobody noticed.

Also reorder the matching dma_sync_single_for_device() a little bit
so that they reside in the same functions as their counterparts.
This also avoids syncing the s/g table for requests which don't use it.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 16 insertions, 34 deletions

diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index 1d6ad3435537..7a8119e0c910 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -1533,6 +1533,10 @@ static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
                 orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
                 orb->data_descriptor_lo = cmd->sge_dma;
 
+                dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma,
+                                        sizeof(cmd->scatter_gather_element),
+                                        DMA_TO_DEVICE);
+
                 /* loop through and fill out our SBP-2 page tables
                  * (and split up anything too large) */
                 for (i = 0, sg_count = 0; i < count; i++, sg = sg_next(sg)) {
@@ -1559,6 +1563,11 @@ static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
                 sbp2util_cpu_to_be32_buffer(sg_element,
                                 (sizeof(struct sbp2_unrestricted_page_table)) *
                                 sg_count);
+
+                dma_sync_single_for_device(hi->host->device.parent,
+                                           cmd->sge_dma,
+                                           sizeof(cmd->scatter_gather_element),
+                                           DMA_TO_DEVICE);
         }
 }
 
@@ -1566,12 +1575,14 @@ static void sbp2_create_command_orb(struct sbp2_lu *lu,
                                     struct sbp2_command_info *cmd,
                                     struct scsi_cmnd *SCpnt)
 {
-        struct sbp2_fwhost_info *hi = lu->hi;
+        struct device *dmadev = lu->hi->host->device.parent;
         struct sbp2_command_orb *orb = &cmd->command_orb;
         u32 orb_direction;
         unsigned int scsi_request_bufflen = scsi_bufflen(SCpnt);
         enum dma_data_direction dma_dir = SCpnt->sc_data_direction;
 
+        dma_sync_single_for_cpu(dmadev, cmd->command_orb_dma,
+                                sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
         /*
          * Set-up our command ORB.
          *
@@ -1603,7 +1614,7 @@ static void sbp2_create_command_orb(struct sbp2_lu *lu,
                 orb->data_descriptor_lo = 0x0;
                 orb->misc |= ORB_SET_DIRECTION(1);
         } else
-                sbp2_prep_command_orb_sg(orb, hi, cmd, scsi_sg_count(SCpnt),
+                sbp2_prep_command_orb_sg(orb, lu->hi, cmd, scsi_sg_count(SCpnt),
                                          scsi_sglist(SCpnt),
                                          orb_direction, dma_dir);
 
@@ -1611,6 +1622,9 @@ static void sbp2_create_command_orb(struct sbp2_lu *lu,
 
         memset(orb->cdb, 0, sizeof(orb->cdb));
         memcpy(orb->cdb, SCpnt->cmnd, SCpnt->cmd_len);
+
+        dma_sync_single_for_device(dmadev, cmd->command_orb_dma,
+                        sizeof(struct sbp2_command_orb), DMA_TO_DEVICE);
 }
 
 static void sbp2_link_orb_command(struct sbp2_lu *lu,
@@ -1624,14 +1638,6 @@ static void sbp2_link_orb_command(struct sbp2_lu *lu,
         size_t length;
         unsigned long flags;
 
-        dma_sync_single_for_device(hi->host->device.parent,
-                                   cmd->command_orb_dma,
-                                   sizeof(struct sbp2_command_orb),
-                                   DMA_TO_DEVICE);
-        dma_sync_single_for_device(hi->host->device.parent, cmd->sge_dma,
-                                   sizeof(cmd->scatter_gather_element),
-                                   DMA_TO_DEVICE);
-
         /* check to see if there are any previous orbs to use */
         spin_lock_irqsave(&lu->cmd_orb_lock, flags);
         last_orb = lu->last_orb;
@@ -1789,13 +1795,6 @@ static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid,
         else
                 cmd = sbp2util_find_command_for_orb(lu, sb->ORB_offset_lo);
         if (cmd) {
-                dma_sync_single_for_cpu(hi->host->device.parent,
-                                        cmd->command_orb_dma,
-                                        sizeof(struct sbp2_command_orb),
-                                        DMA_TO_DEVICE);
-                dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma,
-                                        sizeof(cmd->scatter_gather_element),
-                                        DMA_TO_DEVICE);
                 /* Grab SCSI command pointers and check status. */
                 /*
                  * FIXME: If the src field in the status is 1, the ORB DMA must
@@ -1912,7 +1911,6 @@ done:
 
 static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status)
 {
-        struct sbp2_fwhost_info *hi = lu->hi;
         struct list_head *lh;
         struct sbp2_command_info *cmd;
         unsigned long flags;
@@ -1921,13 +1919,6 @@ static void sbp2scsi_complete_all_commands(struct sbp2_lu *lu, u32 status)
         while (!list_empty(&lu->cmd_orb_inuse)) {
                 lh = lu->cmd_orb_inuse.next;
                 cmd = list_entry(lh, struct sbp2_command_info, list);
-                dma_sync_single_for_cpu(hi->host->device.parent,
-                                        cmd->command_orb_dma,
-                                        sizeof(struct sbp2_command_orb),
-                                        DMA_TO_DEVICE);
-                dma_sync_single_for_cpu(hi->host->device.parent, cmd->sge_dma,
-                                        sizeof(cmd->scatter_gather_element),
-                                        DMA_TO_DEVICE);
                 sbp2util_mark_command_completed(lu, cmd);
                 if (cmd->Current_SCpnt) {
                         cmd->Current_SCpnt->result = status << 16;
@@ -2049,7 +2040,6 @@ static void sbp2scsi_slave_destroy(struct scsi_device *sdev)
 static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
 {
         struct sbp2_lu *lu = (struct sbp2_lu *)SCpnt->device->host->hostdata[0];
-        struct sbp2_fwhost_info *hi = lu->hi;
         struct sbp2_command_info *cmd;
         unsigned long flags;
 
@@ -2063,14 +2053,6 @@ static int sbp2scsi_abort(struct scsi_cmnd *SCpnt)
                 spin_lock_irqsave(&lu->cmd_orb_lock, flags);
                 cmd = sbp2util_find_command_for_SCpnt(lu, SCpnt);
                 if (cmd) {
-                        dma_sync_single_for_cpu(hi->host->device.parent,
-                                        cmd->command_orb_dma,
-                                        sizeof(struct sbp2_command_orb),
-                                        DMA_TO_DEVICE);
-                        dma_sync_single_for_cpu(hi->host->device.parent,
-                                        cmd->sge_dma,
-                                        sizeof(cmd->scatter_gather_element),
-                                        DMA_TO_DEVICE);
                         sbp2util_mark_command_completed(lu, cmd);
                         if (cmd->Current_SCpnt) {
                                 cmd->Current_SCpnt->result = DID_ABORT << 16;