Re: [PATCH] sym53c8xx_2: slave_alloc/destroy safety (2.6.27.5)

Mike Christie <michaelc@xxxxxxxxxxx> · Mon, 15 Dec 2008 10:56:42 -0600

Koskinen Aaro (NSN - FI/Helsinki) wrote:
Make the sym53c8xx_2 driver slave_alloc/destroy less unsafe. References
to the destroyed LCB are cleared from the target structure (instead of
leaving a dangling pointer), and when the last LCB for the target is
destroyed the reference to the upper layer target data is cleared. The
host lock is used to prevent a race with the interrupt handler. Also
user commands are prevented for targets with all LCBs destroyed.

Signed-off-by: aaro.koskinen@xxxxxxx


Same signed off line issue. Should be Signed-off-by: Aaro Koskinen 
<aaro.koskinen@xxxxxxx>.

There were also some whitespace issues, but merging it with git-am 
--whitespace=fix fixed them up.


---

diff -uprN -X linux-2.6.27.5-orig/Documentation/dontdiff linux-2.6.27.5-orig/drivers/scsi/sym53c8xx_2/sym_glue.c linux-2.6.27.5/drivers/scsi/sym53c8xx_2/sym_glue.c

--- linux-2.6.27.5-orig/drivers/scsi/sym53c8xx_2/sym_glue.c	2008-11-07 19:55:34.000000000 +0200
+++ linux-2.6.27.5/drivers/scsi/sym53c8xx_2/sym_glue.c	2008-11-19 12:19:03.000000000 +0200
@@ -737,11 +737,14 @@ static int sym53c8xx_slave_alloc(struct 
 
+	if (tp->nlcb && tp->starget != sdev->sdev_target) {
+		error = -EBUSY;
+		goto out;
+	}
+


I do not think this is needed now. With your changes to slave_destroy 
below, the driver should now clear that starget pointer up, and if 
scsi-ml were screwing things in a way that resulted in us doing this 
maybe we would need some checks in scsi_scan.c because we could be 
hitting some bugs in other drivers.


 	lp = sym_alloc_lcb(np, sdev->id, sdev->lun);
-	if (!lp)
-		return -ENOMEM;
+	if (!lp) {
+		error = -ENOMEM;
+		goto out;
+	}
+	if (tp->nlcb == 1) {
+		tp->starget = sdev->sdev_target;
+	}
 
 	spi_min_period(tp->starget) = tp->usr_period;
 	spi_max_width(tp->starget) = tp->usr_width;
 
-	return 0;
+	error = 0;
+out:
+	spin_unlock_irqrestore(np->s.host->host_lock, flags);
+
+	return error;
 }
 
 /*
@@ -819,12 +839,34 @@ static int sym53c8xx_slave_configure(str
 static void sym53c8xx_slave_destroy(struct scsi_device *sdev)
 {
 	struct sym_hcb *np = sym_get_hcb(sdev->host);
-	struct sym_lcb *lp = sym_lp(&np->target[sdev->id], sdev->lun);
+	struct sym_tcb *tp = &np->target[sdev->id];
+	struct sym_lcb *lp = sym_lp(tp, sdev->lun);
+	unsigned long flags;
+
+	spin_lock_irqsave(np->s.host->host_lock, flags);
 
-	if (lp->itlq_tbl)
-		sym_mfree_dma(lp->itlq_tbl, SYM_CONF_MAX_TASK * 4, "ITLQ_TBL");
-	kfree(lp->cb_tags);
-	sym_mfree_dma(lp, sizeof(*lp), "LCB");
+	if (lp->busy_itlq || lp->busy_itl) {
+		/*
+		 * This really shouldn't happen, but we can't return an error
+		 * so let's try to stop all on-going I/O.
+		 */
+		starget_printk(KERN_WARNING, tp->starget,
+			       "Removing busy LCB (%d)\n", sdev->lun);
+		sym_reset_scsi_bus(np, 1);
+	}
+
+ 	if (sym_free_lcb(np, sdev->id, sdev->lun) == 0) {
+		/*
+ 		 * It was the last unit for this target.
+ 		 */
+ 		tp->head.sval        = 0;
+ 		tp->head.wval        = np->rv_scntl3;
+ 		tp->head.uval        = 0;
+ 		tp->tgoal.check_nego = 1;
+ 		tp->starget	     = NULL;
+ 	}
+ 
+	spin_unlock_irqrestore(np->s.host->host_lock, flags);
 }
 
 /*
@@ -890,6 +932,8 @@ static void sym_exec_user_command (struc
 			if (!((uc->target >> t) & 1))
 				continue;
 			tp = &np->target[t];
+			if (!tp->nlcb)
+				continue;
 
 			switch (uc->cmd) {
 
diff -uprN -X linux-2.6.27.5-orig/Documentation/dontdiff linux-2.6.27.5-orig/drivers/scsi/sym53c8xx_2/sym_hipd.c linux-2.6.27.5/drivers/scsi/sym53c8xx_2/sym_hipd.c
--- linux-2.6.27.5-orig/drivers/scsi/sym53c8xx_2/sym_hipd.c	2008-11-07 19:55:34.000000000 +0200
+++ linux-2.6.27.5/drivers/scsi/sym53c8xx_2/sym_hipd.c	2008-11-19 12:19:01.000000000 +0200
@@ -4973,6 +4973,7 @@ struct sym_lcb *sym_alloc_lcb (struct sy
 		tp->lun0p = lp;
 		tp->head.lun0_sa = cpu_to_scr(vtobus(lp));
 	}
+	tp->nlcb++;
 
 	/*
 	 *  Let the itl task point to error handling.
@@ -5050,6 +5051,43 @@ fail:
 }
 
 /*
+ *  Lun control block deallocation. Returns the number of valid remaing LCBs
+ *  for the target.
+ */
+int sym_free_lcb (struct sym_hcb *np, u_char tn, u_char ln)
+{
+	struct sym_tcb *tp = &np->target[tn];
+	struct sym_lcb *lp = sym_lp(tp, ln);
+
+	tp->nlcb--;
+
+	if (ln) {
+		if (!tp->nlcb) {
+			kfree(tp->lunmp);
+			sym_mfree_dma(tp->luntbl, 256, "LUNTBL");
+			tp->lunmp = NULL;
+			tp->luntbl = NULL;
+			tp->head.luntbl_sa = cpu_to_scr(vtobus(np->badluntbl));
+		} else {
+			tp->luntbl[ln] = cpu_to_scr(vtobus(&np->badlun_sa));
+			tp->lunmp[ln] = NULL;
+		}
+	} else {
+		tp->lun0p = NULL;
+		tp->head.lun0_sa = cpu_to_scr(vtobus(&np->badlun_sa));
+	}
+
+	if (lp->itlq_tbl) {
+		sym_mfree_dma(lp->itlq_tbl, SYM_CONF_MAX_TASK*4, "ITLQ_TBL");
+		kfree(lp->cb_tags);
+	}
+
+	sym_mfree_dma(lp, sizeof(*lp), "LCB");
+
+	return tp->nlcb;
+}
+
+/*
  *  Queue a SCSI IO to the controller.
  */
 int sym_queue_scsiio(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
diff -uprN -X linux-2.6.27.5-orig/Documentation/dontdiff linux-2.6.27.5-orig/drivers/scsi/sym53c8xx_2/sym_hipd.h linux-2.6.27.5/drivers/scsi/sym53c8xx_2/sym_hipd.h
--- linux-2.6.27.5-orig/drivers/scsi/sym53c8xx_2/sym_hipd.h	2008-11-07 19:55:34.000000000 +0200
+++ linux-2.6.27.5/drivers/scsi/sym53c8xx_2/sym_hipd.h	2008-11-19 12:19:00.000000000 +0200
@@ -400,6 +400,7 @@ struct sym_tcb {
 	 *  An array of bus addresses is used on reselection.
 	 */
 	u32	*luntbl;	/* LCBs bus address table	*/
+	int	nlcb;		/* Number of valid LCBs (including LUN #0) */
 
 	/*
 	 *  LUN table used by the C code.
@@ -1061,6 +1062,7 @@ int sym_clear_tasks(struct sym_hcb *np, 
 struct sym_ccb *sym_get_ccb(struct sym_hcb *np, struct scsi_cmnd *cmd, u_char tag_order);
 void sym_free_ccb(struct sym_hcb *np, struct sym_ccb *cp);
 struct sym_lcb *sym_alloc_lcb(struct sym_hcb *np, u_char tn, u_char ln);
+int sym_free_lcb(struct sym_hcb *np, u_char tn, u_char ln);
 int sym_queue_scsiio(struct sym_hcb *np, struct scsi_cmnd *csio, struct sym_ccb *cp);
 int sym_abort_scsiio(struct sym_hcb *np, struct scsi_cmnd *ccb, int timed_out);
 int sym_reset_scsi_target(struct sym_hcb *np, int target);
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