From: Jeff Garzik  <jgarzik@pobox.com>
Date: Sat, 28 May 2005 11:47:39 +0000 (-0400)
Subject: [SCSI] Remove unnecessary locking around completion function calls
X-Git-Tag: v2.6.13-rc1~90^2~583^2~62^2^2~5
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e3df715501be3329986e5d9dfa9a477f49e7996b;p=linux-2.6

[SCSI] Remove unnecessary locking around completion function calls

The SCSI ->done() hook should not be called from inside a spinlock.

Drivers that do this are mostly cut-n-paste from 2.2.x-era.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
---

diff --git a/drivers/fc4/fc.c b/drivers/fc4/fc.c
index 1fbb219aa9..d9e11b5366 100644
--- a/drivers/fc4/fc.c
+++ b/drivers/fc4/fc.c
@@ -767,10 +767,8 @@ static void fcp_scsi_done (Scsi_Cmnd *SCpnt)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
 	if (FCP_CMND(SCpnt)->done)
 		FCP_CMND(SCpnt)->done(SCpnt);
-	spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
 }
 
 static int fcp_scsi_queue_it(fc_channel *fc, Scsi_Cmnd *SCpnt, fcp_cmnd *fcmd, int prepare)
@@ -912,9 +910,7 @@ int fcp_scsi_abort(Scsi_Cmnd *SCpnt)
 		unsigned long flags;
 
 		SCpnt->result = DID_ABORT;
-		spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
 		fcmd->done(SCpnt);
-		spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
 		printk("FC: soft abort\n");
 		return SUCCESS;
 	} else {
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index aa94102507..de552486b1 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -2453,8 +2453,6 @@ static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id,
 				      u32 scsi_status, struct scsi_cmnd *SCpnt,
 				      void (*done)(struct scsi_cmnd *))
 {
-	unsigned long flags;
-
 	SBP2_DEBUG("sbp2scsi_complete_command");
 
 	/*
@@ -2553,11 +2551,7 @@ static void sbp2scsi_complete_command(struct scsi_id_instance_data *scsi_id,
 	/*
 	 * Tell scsi stack that we're done with this command
 	 */
-	spin_lock_irqsave(scsi_id->scsi_host->host_lock,flags);
 	done (SCpnt);
-	spin_unlock_irqrestore(scsi_id->scsi_host->host_lock,flags);
-
-	return;
 }
 
 
diff --git a/drivers/scsi/ultrastor.c b/drivers/scsi/ultrastor.c
index 97f4d9112b..2c17470a22 100644
--- a/drivers/scsi/ultrastor.c
+++ b/drivers/scsi/ultrastor.c
@@ -954,9 +954,7 @@ static int ultrastor_abort(Scsi_Cmnd *SCpnt)
     SCpnt->result = DID_ABORT << 16;
     
     /* Take the host lock to guard against scsi layer re-entry */
-    spin_lock_irqsave(host->host_lock, flags);
     done(SCpnt);
-    spin_unlock_irqrestore(host->host_lock, flags);
 
     /* Need to set a timeout here in case command never completes.  */
     return SUCCESS;