[PATCH] I2O: first code cleanup of spare warnings and unused functions

Changes:

 - Removed unnecessary checking of NULL before calling kfree()
 - Make some functions static
 - Changed pr_debug() into osm_debug()
 - Use i2o_msg_in_to_virt() for getting a pointer to the message frame
 - Cleaned up some comments
 - Changed some le32_to_cpu() into readl() where necessary
 - Make error messages of OSM's look the same
 - Cleaned up error handling in i2o_block_end_request()
 - Removed unused error handling of failed messages in Block-OSM, which
   are not allowed by the I2O spec
 - Corrected the blocksize detection in i2o_block
 - Added hrt and lct sysfs-attribute to controller
 - Call done() function in SCSI-OSM after freeing DMA buffers
 - Removed unneeded variable for message size calculation in
   i2o_scsi_queuecommand()
 - Make some changes to remove sparse warnings
 - Reordered some functions
 - Cleaned up controller initialization
 - Replaced some magic numbers by defines
 - Removed unnecessary dma_sync_single_for_cpu() call on coherent DMA
 - Removed some unused fields in i2o_controller and removed some unused
   functions

Signed-off-by: Markus Lidel <Markus.Lidel@shadowconnect.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 71 insertions, 140 deletions

diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
index 4830b7759061..e69421e36ac5 100644
--- a/drivers/message/i2o/i2o_block.c
+++ b/drivers/message/i2o/i2o_block.c
@@ -104,7 +104,8 @@ static int i2o_block_remove(struct device *dev)
         struct i2o_device *i2o_dev = to_i2o_device(dev);
         struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev);
 
-        osm_info("Device removed %s\n", i2o_blk_dev->gd->disk_name);
+        osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid,
+                 i2o_blk_dev->gd->disk_name);
 
         i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0);
 
@@ -400,71 +401,62 @@ static void i2o_block_delayed_request_fn(void *delayed_request)
 };
 
 /**
- *      i2o_block_reply - Block OSM reply handler.
- *      @c: I2O controller from which the message arrives
- *      @m: message id of reply
- *      qmsg: the actuall I2O message reply
+ *      i2o_block_end_request - Post-processing of completed commands
+ *      @req: request which should be completed
+ *      @uptodate: 1 for success, 0 for I/O error, < 0 for specific error
+ *      @nr_bytes: number of bytes to complete
  *
- *      This function gets all the message replies.
+ *      Mark the request as complete. The lock must not be held when entering.
  *
  */
-static int i2o_block_reply(struct i2o_controller *c, u32 m,
-                           struct i2o_message *msg)
+static void i2o_block_end_request(struct request *req, int uptodate,
+                                  int nr_bytes)
 {
-        struct i2o_block_request *ireq;
-        struct request *req;
-        struct i2o_block_device *dev;
-        struct request_queue *q;
-        u8 st;
+        struct i2o_block_request *ireq = req->special;
+        struct i2o_block_device *dev = ireq->i2o_blk_dev;
+        request_queue_t *q = dev->gd->queue;
         unsigned long flags;
 
-        /* FAILed message */
-        if (unlikely(le32_to_cpu(msg->u.head[0]) & (1 << 13))) {
-                struct i2o_message *pmsg;
-                u32 pm;
-
-                /*
-                 * FAILed message from controller
-                 * We increment the error count and abort it
-                 *
-                 * In theory this will never happen.  The I2O block class
-                 * specification states that block devices never return
-                 * FAILs but instead use the REQ status field...but
-                 * better be on the safe side since no one really follows
-                 * the spec to the book :)
-                 */
-                pm = le32_to_cpu(msg->body[3]);
-                pmsg = i2o_msg_in_to_virt(c, pm);
+        if (end_that_request_chunk(req, uptodate, nr_bytes)) {
+                int leftover = (req->hard_nr_sectors << 9);
 
-                req = i2o_cntxt_list_get(c, le32_to_cpu(pmsg->u.s.tcntxt));
-                if (unlikely(!req)) {
-                        osm_err("NULL reply received!\n");
-                        return -1;
-                }
+                if (blk_pc_request(req))
+                        leftover = req->data_len;
 
-                ireq = req->special;
-                dev = ireq->i2o_blk_dev;
-                q = dev->gd->queue;
+                if (end_io_error(uptodate))
+                        end_that_request_chunk(req, 0, leftover);
+        }
 
-                req->errors++;
+        add_disk_randomness(req->rq_disk);
 
-                spin_lock_irqsave(q->queue_lock, flags);
+        spin_lock_irqsave(q->queue_lock, flags);
 
-                while (end_that_request_chunk(req, !req->errors,
-                                              le32_to_cpu(pmsg->body[1]))) ;
-                end_that_request_last(req);
+        end_that_request_last(req);
+        dev->open_queue_depth--;
+        list_del(&ireq->queue);
 
-                dev->open_queue_depth--;
-                list_del(&ireq->queue);
-                blk_start_queue(q);
+        blk_start_queue(q);
 
-                spin_unlock_irqrestore(q->queue_lock, flags);
+        spin_unlock_irqrestore(q->queue_lock, flags);
 
-                /* Now flush the message by making it a NOP */
-                i2o_msg_nop(c, pm);
+        i2o_block_sglist_free(ireq);
+        i2o_block_request_free(ireq);
+};
 
-                return -1;
-        }
+/**
+ *      i2o_block_reply - Block OSM reply handler.
+ *      @c: I2O controller from which the message arrives
+ *      @m: message id of reply
+ *      qmsg: the actuall I2O message reply
+ *
+ *      This function gets all the message replies.
+ *
+ */
+static int i2o_block_reply(struct i2o_controller *c, u32 m,
+                           struct i2o_message *msg)
+{
+        struct request *req;
+        int uptodate = 1;
 
         req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
         if (unlikely(!req)) {
@@ -472,61 +464,13 @@ static int i2o_block_reply(struct i2o_controller *c, u32 m,
                 return -1;
         }
 
-        ireq = req->special;
-        dev = ireq->i2o_blk_dev;
-        q = dev->gd->queue;
-
-        if (unlikely(!dev->i2o_dev)) {
-                /*
-                 * This is HACK, but Intel Integrated RAID allows user
-                 * to delete a volume that is claimed, locked, and in use
-                 * by the OS. We have to check for a reply from a
-                 * non-existent device and flag it as an error or the system
-                 * goes kaput...
-                 */
-                req->errors++;
-                osm_warn("Data transfer to deleted device!\n");
-                spin_lock_irqsave(q->queue_lock, flags);
-                while (end_that_request_chunk
-                       (req, !req->errors, le32_to_cpu(msg->body[1]))) ;
-                end_that_request_last(req);
-
-                dev->open_queue_depth--;
-                list_del(&ireq->queue);
-                blk_start_queue(q);
-
-                spin_unlock_irqrestore(q->queue_lock, flags);
-                return -1;
-        }
-
         /*
          *      Lets see what is cooking. We stuffed the
          *      request in the context.
          */
 
-        st = le32_to_cpu(msg->body[0]) >> 24;
-
-        if (st != 0) {
-                int err;
-                char *bsa_errors[] = {
-                        "Success",
-                        "Media Error",
-                        "Failure communicating to device",
-                        "Device Failure",
-                        "Device is not ready",
-                        "Media not present",
-                        "Media is locked by another user",
-                        "Media has failed",
-                        "Failure communicating to device",
-                        "Device bus failure",
-                        "Device is locked by another user",
-                        "Device is write protected",
-                        "Device has reset",
-                        "Volume has changed, waiting for acknowledgement"
-                };
-
-                err = le32_to_cpu(msg->body[0]) & 0xffff;
-
+        if ((le32_to_cpu(msg->body[0]) >> 24) != 0) {
+                u32 status = le32_to_cpu(msg->body[0]);
                 /*
                  *      Device not ready means two things. One is that the
                  *      the thing went offline (but not a removal media)
@@ -539,40 +483,23 @@ static int i2o_block_reply(struct i2o_controller *c, u32 m,
                  *      Don't stick a supertrak100 into cache aggressive modes
                  */
 
-                osm_err("block-osm: /dev/%s error: %s", dev->gd->disk_name,
-                        bsa_errors[le32_to_cpu(msg->body[0]) & 0xffff]);
-                if (le32_to_cpu(msg->body[0]) & 0x00ff0000)
-                        printk(KERN_ERR " - DDM attempted %d retries",
-                               (le32_to_cpu(msg->body[0]) >> 16) & 0x00ff);
-                printk(KERN_ERR ".\n");
-                req->errors++;
-        } else
-                req->errors = 0;
-
-        if (!end_that_request_chunk
-            (req, !req->errors, le32_to_cpu(msg->body[1]))) {
-                add_disk_randomness(req->rq_disk);
-                spin_lock_irqsave(q->queue_lock, flags);
+                osm_err("%03x error status: %02x, detailed status: %04x\n",
+                        (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff),
+                        status >> 24, status & 0xffff);
 
-                end_that_request_last(req);
+                req->errors++;
 
-                dev->open_queue_depth--;
-                list_del(&ireq->queue);
-                blk_start_queue(q);
+                uptodate = 0;
+        }
 
-                spin_unlock_irqrestore(q->queue_lock, flags);
-
-                i2o_block_sglist_free(ireq);
-                i2o_block_request_free(ireq);
-        } else
-                osm_err("still remaining chunks\n");
+        i2o_block_end_request(req, uptodate, le32_to_cpu(msg->body[1]));
 
         return 1;
 };
 
 static void i2o_block_event(struct i2o_event *evt)
 {
-        osm_info("block-osm: event received\n");
+        osm_info("event received\n");
         kfree(evt);
 };
 
@@ -875,9 +802,7 @@ static int i2o_block_transfer(struct request *req)
                 sg++;
         }
 
-        writel(I2O_MESSAGE_SIZE
-               (((unsigned long)mptr -
-                 (unsigned long)&msg->u.head[0]) >> 2) | SGL_OFFSET_8,
+        writel(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | SGL_OFFSET_8,
                &msg->u.head[0]);
 
         list_add_tail(&ireq->queue, &dev->open_queue);
@@ -1048,7 +973,6 @@ static int i2o_block_probe(struct device *dev)
         int rc;
         u64 size;
         u32 blocksize;
-        u16 power;
         u32 flags, status;
         int segments;
 
@@ -1058,8 +982,6 @@ static int i2o_block_probe(struct device *dev)
                 return -ENODEV;
         }
 
-        osm_info("New device detected (TID: %03x)\n", i2o_dev->lct_data.tid);
-
         if (i2o_device_claim(i2o_dev)) {
                 osm_warn("Unable to claim device. Installation aborted\n");
                 rc = -EFAULT;
@@ -1111,15 +1033,21 @@ static int i2o_block_probe(struct device *dev)
          *      Ask for the current media data. If that isn't supported
          *      then we ask for the device capacity data
          */
-        if (i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) != 0
-            || i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) != 0) {
-                i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4);
-                i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8);
-        }
-        osm_debug("blocksize = %d\n", blocksize);
+        if (!i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8))
+                if (!i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) {
+                        osm_warn("could not get size of %s\n", gd->disk_name);
+                        size = 0;
+                }
 
-        if (i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2))
-                power = 0;
+        if (!i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4))
+                if (!i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) {
+                        osm_warn("unable to get blocksize of %s\n",
+                                 gd->disk_name);
+                        blocksize = 0;
+                }
+
+        if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &i2o_blk_dev->power, 2))
+                i2o_blk_dev->power = 0;
         i2o_parm_field_get(i2o_dev, 0x0000, 5, &flags, 4);
         i2o_parm_field_get(i2o_dev, 0x0000, 6, &status, 4);
 
@@ -1131,6 +1059,9 @@ static int i2o_block_probe(struct device *dev)
 
         unit++;
 
+        osm_info("device added (TID: %03x): %s\n", i2o_dev->lct_data.tid,
+                 i2o_blk_dev->gd->disk_name);
+
         return 0;
 
       claim_release: