Re: [ck] 2.6.11-ck6

[Con Kolivas <kernel@kolivas.org>]

On Sun, 1 May 2005 06:13, Jens Axboe wrote:
> On Sun, May 01 2005, Con Kolivas wrote:
> > +scsi-dead-device.diff
> > A fix for a scsi related hang that seems to hit many -ck users
>
> This looks strange, like a fix and a half. You should just apply the
> patch I sent you originally, weeks ago, changing sdev->sdev_lock to
> &q->__queue_lock.

rarrgh

Thanks for keeping an eye out on for this. Unfortunately you sent more than 
one patch at different times and it looks like I included the wrong one then? 
This is the patch I (tried to) include.

Con

===== drivers/scsi/scsi_lib.c 1.151 vs edited =====
--- 1.151/drivers/scsi/scsi_lib.c	2005-02-17 20:17:22 +01:00
+++ edited/drivers/scsi/scsi_lib.c	2005-03-18 12:33:09 +01:00
@@ -1233,6 +1233,22 @@ static inline int scsi_host_queue_ready(
 }
 
 /*
+ * Kill requests for a dead device
+ */
+static void scsi_kill_requests(request_queue_t *q)
+{
+	struct request *req;
+
+	while ((req = elv_next_request(q)) != NULL) {
+		blkdev_dequeue_request(req);
+		req->flags |= REQ_QUIET;
+		while (end_that_request_first(req, 0, req->nr_sectors))
+			;
+		end_that_request_last(req);
+	}
+}
+
+/*
  * Function:    scsi_request_fn()
  *
  * Purpose:     Main strategy routine for SCSI.
@@ -1246,10 +1262,16 @@ static inline int scsi_host_queue_ready(
 static void scsi_request_fn(struct request_queue *q)
 {
 	struct scsi_device *sdev = q->queuedata;
-	struct Scsi_Host *shost = sdev->host;
+	struct Scsi_Host *shost;
 	struct scsi_cmnd *cmd;
 	struct request *req;
 
+	if (!sdev) {
+		printk("scsi: killing requests for dead queue\n");
+		scsi_kill_requests(q);
+		return;
+	}
+
 	if(!get_device(&sdev->sdev_gendev))
 		/* We must be tearing the block queue down already */
 		return;
@@ -1258,6 +1280,7 @@ static void scsi_request_fn(struct reque
 	 * To start with, we keep looping until the queue is empty, or until
 	 * the host is no longer able to accept any more requests.
 	 */
+	shost = sdev->host;
 	while (!blk_queue_plugged(q)) {
 		int rtn;
 		/*
===== drivers/scsi/scsi_sysfs.c 1.69 vs edited =====
--- 1.69/drivers/scsi/scsi_sysfs.c	2005-02-17 02:05:37 +01:00
+++ edited/drivers/scsi/scsi_sysfs.c	2005-03-18 12:32:57 +01:00
@@ -168,8 +168,10 @@ void scsi_device_dev_release(struct devi
 	list_del(&sdev->starved_entry);
 	spin_unlock_irqrestore(sdev->host->host_lock, flags);
 
-	if (sdev->request_queue)
+	if (sdev->request_queue) {
+		sdev->request_queue->queuedata = NULL;
 		scsi_free_queue(sdev->request_queue);
+	}
 
 	scsi_target_reap(scsi_target(sdev));

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