1 files changed, 54 insertions, 84 deletions

diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index 449522f0540c..4b441720b6ba 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -681,50 +681,9 @@ static ide_proc_entry_t idedisk_proc[] = {
 
 #endif  /* CONFIG_PROC_FS */
 
-static void idedisk_end_flush(request_queue_t *q, struct request *flush_rq)
+static void idedisk_prepare_flush(request_queue_t *q, struct request *rq)
 {
         ide_drive_t *drive = q->queuedata;
-        struct request *rq = flush_rq->end_io_data;
-        int good_sectors = rq->hard_nr_sectors;
-        int bad_sectors;
-        sector_t sector;
-
-        if (flush_rq->errors & ABRT_ERR) {
-                printk(KERN_ERR "%s: barrier support doesn't work\n", drive->name);
-                blk_queue_ordered(drive->queue, QUEUE_ORDERED_NONE);
-                blk_queue_issue_flush_fn(drive->queue, NULL);
-                good_sectors = 0;
-        } else if (flush_rq->errors) {
-                good_sectors = 0;
-                if (blk_barrier_preflush(rq)) {
-                        sector = ide_get_error_location(drive,flush_rq->buffer);
-                        if ((sector >= rq->hard_sector) &&
-                            (sector < rq->hard_sector + rq->hard_nr_sectors))
-                                good_sectors = sector - rq->hard_sector;
-                }
-        }
-
-        if (flush_rq->errors)
-                printk(KERN_ERR "%s: failed barrier write: "
-                                "sector=%Lx(good=%d/bad=%d)\n",
-                                drive->name, (unsigned long long)rq->sector,
-                                good_sectors,
-                                (int) (rq->hard_nr_sectors-good_sectors));
-
-        bad_sectors = rq->hard_nr_sectors - good_sectors;
-
-        if (good_sectors)
-                __ide_end_request(drive, rq, 1, good_sectors);
-        if (bad_sectors)
-                __ide_end_request(drive, rq, 0, bad_sectors);
-}
-
-static int idedisk_prepare_flush(request_queue_t *q, struct request *rq)
-{
-        ide_drive_t *drive = q->queuedata;
-
-        if (!drive->wcache)
-                return 0;
 
         memset(rq->cmd, 0, sizeof(rq->cmd));
 
@@ -735,9 +694,8 @@ static int idedisk_prepare_flush(request_queue_t *q, struct request *rq)
                 rq->cmd[0] = WIN_FLUSH_CACHE;
 
 
-        rq->flags |= REQ_DRIVE_TASK | REQ_SOFTBARRIER;
+        rq->flags |= REQ_DRIVE_TASK;
         rq->buffer = rq->cmd;
-        return 1;
 }
 
 static int idedisk_issue_flush(request_queue_t *q, struct gendisk *disk,
@@ -794,27 +752,64 @@ static int set_nowerr(ide_drive_t *drive, int arg)
         return 0;
 }
 
+static void update_ordered(ide_drive_t *drive)
+{
+        struct hd_driveid *id = drive->id;
+        unsigned ordered = QUEUE_ORDERED_NONE;
+        prepare_flush_fn *prep_fn = NULL;
+        issue_flush_fn *issue_fn = NULL;
+
+        if (drive->wcache) {
+                unsigned long long capacity;
+                int barrier;
+                /*
+                 * We must avoid issuing commands a drive does not
+                 * understand or we may crash it. We check flush cache
+                 * is supported. We also check we have the LBA48 flush
+                 * cache if the drive capacity is too large. By this
+                 * time we have trimmed the drive capacity if LBA48 is
+                 * not available so we don't need to recheck that.
+                 */
+                capacity = idedisk_capacity(drive);
+                barrier = ide_id_has_flush_cache(id) &&
+                        (drive->addressing == 0 || capacity <= (1ULL << 28) ||
+                         ide_id_has_flush_cache_ext(id));
+
+                printk(KERN_INFO "%s: cache flushes %ssupported\n",
+                       drive->name, barrier ? "" : "not");
+
+                if (barrier) {
+                        ordered = QUEUE_ORDERED_DRAIN_FLUSH;
+                        prep_fn = idedisk_prepare_flush;
+                        issue_fn = idedisk_issue_flush;
+                }
+        } else
+                ordered = QUEUE_ORDERED_DRAIN;
+
+        blk_queue_ordered(drive->queue, ordered, prep_fn);
+        blk_queue_issue_flush_fn(drive->queue, issue_fn);
+}
+
 static int write_cache(ide_drive_t *drive, int arg)
 {
         ide_task_t args;
-        int err;
-
-        if (!ide_id_has_flush_cache(drive->id))
-                return 1;
+        int err = 1;
 
-        memset(&args, 0, sizeof(ide_task_t));
-        args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ?
+        if (ide_id_has_flush_cache(drive->id)) {
+                memset(&args, 0, sizeof(ide_task_t));
+                args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ?
                         SETFEATURES_EN_WCACHE : SETFEATURES_DIS_WCACHE;
-        args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
-        args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
-        args.handler                            = &task_no_data_intr;
+                args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
+                args.command_type               = IDE_DRIVE_TASK_NO_DATA;
+                args.handler                    = &task_no_data_intr;
+                err = ide_raw_taskfile(drive, &args, NULL);
+                if (err == 0)
+                        drive->wcache = arg;
+        }
 
-        err = ide_raw_taskfile(drive, &args, NULL);
-        if (err)
-                return err;
+        update_ordered(drive);
 
-        drive->wcache = arg;
-        return 0;
+        return err;
 }
 
 static int do_idedisk_flushcache (ide_drive_t *drive)
@@ -888,7 +883,6 @@ static void idedisk_setup (ide_drive_t *drive)
 {
         struct hd_driveid *id = drive->id;
         unsigned long long capacity;
-        int barrier;
 
         idedisk_add_settings(drive);
 
@@ -992,31 +986,6 @@ static void idedisk_setup (ide_drive_t *drive)
                 drive->wcache = 1;
 
         write_cache(drive, 1);
-
-        /*
-         * We must avoid issuing commands a drive does not understand
-         * or we may crash it. We check flush cache is supported. We also
-         * check we have the LBA48 flush cache if the drive capacity is
-         * too large. By this time we have trimmed the drive capacity if
-         * LBA48 is not available so we don't need to recheck that.
-         */
-        barrier = 0;
-        if (ide_id_has_flush_cache(id))
-                barrier = 1;
-        if (drive->addressing == 1) {
-                /* Can't issue the correct flush ? */
-                if (capacity > (1ULL << 28) && !ide_id_has_flush_cache_ext(id))
-                        barrier = 0;
-        }
-
-        printk(KERN_INFO "%s: cache flushes %ssupported\n",
-                drive->name, barrier ? "" : "not ");
-        if (barrier) {
-                blk_queue_ordered(drive->queue, QUEUE_ORDERED_FLUSH);
-                drive->queue->prepare_flush_fn = idedisk_prepare_flush;
-                drive->queue->end_flush_fn = idedisk_end_flush;
-                blk_queue_issue_flush_fn(drive->queue, idedisk_issue_flush);
-        }
 }
 
 static void ide_cacheflush_p(ide_drive_t *drive)
@@ -1271,6 +1240,7 @@ static int __init idedisk_init(void)
         return driver_register(&idedisk_driver.gen_driver);
 }
 
+MODULE_ALIAS("ide:*m-disk*");
 module_init(idedisk_init);
 module_exit(idedisk_exit);
 MODULE_LICENSE("GPL");