linux-kernel - [PATCH 1/3] ide-cd: carve out an ide_cd_breathe()-helper for fs write requests

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Message-Id: <1238745519-19389-1-git-send-email-petkovbb@gmail.com>
Date:	Fri,  3 Apr 2009 09:58:37 +0200
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	<bzolnier@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: [PATCH 1/3] ide-cd: carve out an ide_cd_breathe()-helper for fs write requests

There should be no functional change resulting from this patch.

Signed-off-by: Borislav Petkov <petkovbb@...il.com>
---
 drivers/ide/ide-cd.c |   65 +++++++++++++++++++++++++++++--------------------
 1 files changed, 38 insertions(+), 27 deletions(-)

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index a4afd90..7bbdeb7 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -265,7 +265,43 @@ static void ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
 		cdrom_analyze_sense_data(drive, NULL, sense);
 }
 
+
 /*
+ * Allow the drive 5 seconds to recover; some devices will return NOT_READY
+ * while flushing data from cache.
+ *
+ * returns: 0 failed (write timeout expired)
+ *	    1 success
+ */
+static int ide_cd_breathe(ide_drive_t *drive, struct request *rq)
+{
+
+	struct cdrom_info *info = drive->driver_data;
+
+	if (!rq->errors)
+		info->write_timeout = jiffies +	ATAPI_WAIT_WRITE_BUSY;
+
+	rq->errors = 1;
+
+	if (time_after(jiffies, info->write_timeout))
+		return 0;
+	else {
+		struct request_queue *q = drive->queue;
+		unsigned long flags;
+
+		/*
+		 * take a breather relying on the unplug timer to kick us again
+		 */
+
+		spin_lock_irqsave(q->queue_lock, flags);
+		blk_plug_device(q);
+		spin_unlock_irqrestore(q->queue_lock, flags);
+
+		return 1;
+	}
+}
+
+/**
  * Returns:
  * 0: if the request should be continued.
  * 1: if the request will be going through error recovery.
@@ -348,36 +384,11 @@ static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
 				/* fail the request */
 				printk(KERN_ERR PFX "%s: tray open\n",
 						drive->name);
-				do_end_request = 1;
 			} else {
-				struct cdrom_info *info = drive->driver_data;
-
-				/*
-				 * Allow the drive 5 seconds to recover, some
-				 * devices will return this error while flushing
-				 * data from cache.
-				 */
-				if (!rq->errors)
-					info->write_timeout = jiffies +
-							ATAPI_WAIT_WRITE_BUSY;
-				rq->errors = 1;
-				if (time_after(jiffies, info->write_timeout))
-					do_end_request = 1;
-				else {
-					struct request_queue *q = drive->queue;
-					unsigned long flags;
-
-					/*
-					 * take a breather relying on the unplug
-					 * timer to kick us again
-					 */
-					spin_lock_irqsave(q->queue_lock, flags);
-					blk_plug_device(q);
-					spin_unlock_irqrestore(q->queue_lock, flags);
-
+				if (ide_cd_breathe(drive, rq))
 					return 1;
-				}
 			}
+			do_end_request = 1;
 		} else if (sense_key == UNIT_ATTENTION) {
 			/* media change */
 			cdrom_saw_media_change(drive);
-- 
1.6.2.1

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