Re: [PATCH v4] SCSI host lock push-down

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On 11/13/2010 12:16 AM, Jeff Garzik wrote:
diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
index 9e71ac6..f9581a3 100644
--- a/drivers/scsi/arm/fas216.c
+++ b/drivers/scsi/arm/fas216.c
@@ -2198,7 +2198,7 @@ no_command:
   * Returns: 0 on success, else error.
   * Notes: io_request_lock is held, interrupts are disabled.
   */
-int fas216_queue_command(struct scsi_cmnd *SCpnt,
+static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
  			 void (*done)(struct scsi_cmnd *))
  {
  	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
@@ -2240,6 +2240,8 @@ int fas216_queue_command(struct scsi_cmnd *SCpnt,
  	return result;
  }

+DEF_SCSI_QCMD(fas216_queue_command)
+
  /**
   * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
   * @SCpnt: Command to wake
@@ -2263,7 +2265,7 @@ static void fas216_internal_done(struct scsi_cmnd *SCpnt)
   * Returns: scsi result code.
   * Notes: io_request_lock is held, interrupts are disabled.
   */
-int fas216_noqueue_command(struct scsi_cmnd *SCpnt,
+static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt,
  			   void (*done)(struct scsi_cmnd *))
  {
  	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
@@ -2277,7 +2279,7 @@ int fas216_noqueue_command(struct scsi_cmnd *SCpnt,
  	BUG_ON(info->scsi.irq != NO_IRQ);

  	info->internal_done = 0;
-	fas216_queue_command(SCpnt, fas216_internal_done);
+	fas216_queue_command(SCpnt->device->host, SCpnt, fas216_internal_done);

  	/*
  	 * This wastes time, since we can't return until the command is


hmmmm.

Linus's suggestion to add Scsi_Host to queuecommand seems to have had a helpful side effect, exposing a minor bug present in nab's (v1), Andi's (v2), my v3 and v4 push-down patches:

A few odd ducks, such as fas16 or ancient megaraid, call their own ->queuecommand directly. None of the major SCSI drivers do this, thankfully.

The host lock push-down patch should be calling the _lck function in those rare cases, otherwise we've created a deadlock.

Time for v5...

	Jeff



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