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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 12-11-2007, 09:51 PM
Kiyoshi Ueda
 
Default blk_end_request: changing ide-cd (take 4)

This patch converts ide-cd (cdrom_newpc_intr()) to use blk_end_request
interfaces. Related 'uptodate' arguments are converted to 'error'.

In PIO mode, ide-cd (cdrom_newpc_intr()) needs to defer
end_that_request_last() until the device clears DRQ_STAT and raises
an interrupt after end_that_request_first().
So blk_end_request() has to return without completing request
even if no leftover in the request.

ide-cd uses blk_end_request_callback() and a dummy callback function,
which just returns value '1', to tell blk_end_request_callback()
about that.

Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
---
drivers/ide/ide-cd.c | 49 +++++++++++++++++++++++++++++++++++--------------
1 files changed, 35 insertions(+), 14 deletions(-)

Index: 2.6.24-rc4/drivers/ide/ide-cd.c
================================================== =================
--- 2.6.24-rc4.orig/drivers/ide/ide-cd.c
+++ 2.6.24-rc4/drivers/ide/ide-cd.c
@@ -1650,6 +1650,17 @@ static int cdrom_write_check_ireason(ide
return 1;
}

+/*
+ * Called from blk_end_request_callback() after the data of the request
+ * is completed and before the request is completed.
+ * By returning value '1', blk_end_request_callback() returns immediately
+ * without completing the request.
+ */
+static int cdrom_newpc_intr_dummy_cb(struct request *rq)
+{
+ return 1;
+}
+
typedef void (xfer_func_t)(ide_drive_t *, void *, u32);

/*
@@ -1688,9 +1699,13 @@ static ide_startstop_t cdrom_newpc_intr(
return ide_error(drive, "dma error", stat);
}

- end_that_request_chunk(rq, 1, rq->data_len);
- rq->data_len = 0;
- goto end_request;
+ spin_lock_irqsave(&ide_lock, flags);
+ if (__blk_end_request(rq, 0, rq->data_len))
+ BUG();
+ HWGROUP(drive)->rq = NULL;
+ spin_unlock_irqrestore(&ide_lock, flags);
+
+ return ide_stopped;
}

/*
@@ -1708,8 +1723,15 @@ static ide_startstop_t cdrom_newpc_intr(
/*
* If DRQ is clear, the command has completed.
*/
- if ((stat & DRQ_STAT) == 0)
- goto end_request;
+ if ((stat & DRQ_STAT) == 0) {
+ spin_lock_irqsave(&ide_lock, flags);
+ if (__blk_end_request(rq, 0, 0))
+ BUG();
+ HWGROUP(drive)->rq = NULL;
+ spin_unlock_irqrestore(&ide_lock, flags);
+
+ return ide_stopped;
+ }

/*
* check which way to transfer data
@@ -1762,7 +1784,14 @@ static ide_startstop_t cdrom_newpc_intr(
rq->data_len -= blen;

if (rq->bio)
- end_that_request_chunk(rq, 1, blen);
+ /*
+ * The request can't be completed until DRQ is cleared.
+ * So complete the data, but don't complete the request
+ * using the dummy function for the callback feature
+ * of blk_end_request_callback().
+ */
+ blk_end_request_callback(rq, 0, blen,
+ cdrom_newpc_intr_dummy_cb);
else
rq->data += blen;
}
@@ -1783,14 +1812,6 @@ static ide_startstop_t cdrom_newpc_intr(

ide_set_handler(drive, cdrom_newpc_intr, rq->timeout, NULL);
return ide_started;
-
-end_request:
- spin_lock_irqsave(&ide_lock, flags);
- blkdev_dequeue_request(rq);
- end_that_request_last(rq, 1);
- HWGROUP(drive)->rq = NULL;
- spin_unlock_irqrestore(&ide_lock, flags);
- return ide_stopped;
}

static ide_startstop_t cdrom_write_intr(ide_drive_t *drive)

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