[SCSI] megaraid_{mm,mbox}: fix a bug in reset handler

When abort failed, the driver gets reset handleer called.  In the reset
handler, driver calls 'scsi_done()' callback for same SCSI command packet
(struct scsi_cmnd) multiple times if there are multiple SCSI command packet
in the pend_list.  More over, if there are entry in the pend_lsit with
IOCTL packet associated, the driver returns it to wrong free_list so that,
in turn, the driver could end up with 'NULL pointer dereference..' during
I/O command building with incorrect resource.

Also, the patch contains several minor/cosmetic changes besides this.

Signed-off-by: Seokmann Ju <seokmann.ju@lsil.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 46 insertions, 20 deletions

diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index c11e5ce6865e..bec1424eda85 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -10,7 +10,7 @@
  *         2 of the License, or (at your option) any later version.
  *
  * FILE         : megaraid_mbox.c
- * Version      : v2.20.4.7 (Nov 14 2005)
+ * Version      : v2.20.4.8 (Apr 11 2006)
  *
  * Authors:
  *      Atul Mukker             <Atul.Mukker@lsil.com>
@@ -2278,6 +2278,7 @@ megaraid_mbox_dpc(unsigned long devp)
         unsigned long           flags;
         uint8_t                 c;
         int                     status;
+        uioc_t                  *kioc;
 
 
         if (!adapter) return;
@@ -2320,6 +2321,9 @@ megaraid_mbox_dpc(unsigned long devp)
                         // remove from local clist
                         list_del_init(&scb->list);
 
+                        kioc                    = (uioc_t *)scb->gp;
+                        kioc->status            = 0;
+
                         megaraid_mbox_mm_done(adapter, scb);
 
                         continue;
@@ -2636,6 +2640,7 @@ megaraid_reset_handler(struct scsi_cmnd *scp)
         int             recovery_window;
         int             recovering;
         int             i;
+        uioc_t          *kioc;
 
         adapter         = SCP2ADAPTER(scp);
         raid_dev        = ADAP2RAIDDEV(adapter);
@@ -2655,32 +2660,51 @@ megaraid_reset_handler(struct scsi_cmnd *scp)
         // Also, reset all the commands currently owned by the driver
         spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
         list_for_each_entry_safe(scb, tmp, &adapter->pend_list, list) {
-
                 list_del_init(&scb->list);      // from pending list
 
-                con_log(CL_ANN, (KERN_WARNING
-                        "megaraid: %ld:%d[%d:%d], reset from pending list\n",
-                                scp->serial_number, scb->sno,
-                                scb->dev_channel, scb->dev_target));
+                if (scb->sno >= MBOX_MAX_SCSI_CMDS) {
+                        con_log(CL_ANN, (KERN_WARNING
+                        "megaraid: IOCTL packet with %d[%d:%d] being reset\n",
+                        scb->sno, scb->dev_channel, scb->dev_target));
 
-                scp->result = (DID_RESET << 16);
-                scp->scsi_done(scp);
+                        scb->status = -1;
 
-                megaraid_dealloc_scb(adapter, scb);
+                        kioc                    = (uioc_t *)scb->gp;
+                        kioc->status            = -EFAULT;
+
+                        megaraid_mbox_mm_done(adapter, scb);
+                } else {
+                        if (scb->scp == scp) {  // Found command
+                                con_log(CL_ANN, (KERN_WARNING
+                                        "megaraid: %ld:%d[%d:%d], reset from pending list\n",
+                                        scp->serial_number, scb->sno,
+                                        scb->dev_channel, scb->dev_target));
+                        } else {
+                                con_log(CL_ANN, (KERN_WARNING
+                                "megaraid: IO packet with %d[%d:%d] being reset\n",
+                                scb->sno, scb->dev_channel, scb->dev_target));
+                        }
+
+                        scb->scp->result = (DID_RESET << 16);
+                        scb->scp->scsi_done(scb->scp);
+
+                        megaraid_dealloc_scb(adapter, scb);
+                }
         }
         spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
 
         if (adapter->outstanding_cmds) {
                 con_log(CL_ANN, (KERN_NOTICE
                         "megaraid: %d outstanding commands. Max wait %d sec\n",
-                        adapter->outstanding_cmds, MBOX_RESET_WAIT));
+                        adapter->outstanding_cmds,
+                        (MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT)));
         }
 
         recovery_window = MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT;
 
         recovering = adapter->outstanding_cmds;
 
-        for (i = 0; i < recovery_window && adapter->outstanding_cmds; i++) {
+        for (i = 0; i < recovery_window; i++) {
 
                 megaraid_ack_sequence(adapter);
 
@@ -2689,12 +2713,11 @@ megaraid_reset_handler(struct scsi_cmnd *scp)
                         con_log(CL_ANN, (
                         "megaraid mbox: Wait for %d commands to complete:%d\n",
                                 adapter->outstanding_cmds,
-                                MBOX_RESET_WAIT - i));
+                                (MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT) - i));
                 }
 
                 // bailout if no recovery happended in reset time
-                if ((i == MBOX_RESET_WAIT) &&
-                        (recovering == adapter->outstanding_cmds)) {
+                if (adapter->outstanding_cmds == 0) {
                         break;
                 }
 
@@ -2918,12 +2941,13 @@ mbox_post_sync_cmd_fast(adapter_t *adapter, uint8_t raw_mbox[])
         wmb();
         WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
 
-        for (i = 0; i < 0xFFFFF; i++) {
+        for (i = 0; i < MBOX_SYNC_WAIT_CNT; i++) {
                 if (mbox->numstatus != 0xFF) break;
                 rmb();
+                udelay(MBOX_SYNC_DELAY_200);
         }
 
-        if (i == 0xFFFFF) {
+        if (i == MBOX_SYNC_WAIT_CNT) {
                 // We may need to re-calibrate the counter
                 con_log(CL_ANN, (KERN_CRIT
                         "megaraid: fast sync command timed out\n"));
@@ -3475,7 +3499,7 @@ megaraid_cmm_register(adapter_t *adapter)
         adp.drvr_data           = (unsigned long)adapter;
         adp.pdev                = adapter->pdev;
         adp.issue_uioc          = megaraid_mbox_mm_handler;
-        adp.timeout             = 300;
+        adp.timeout             = MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT;
         adp.max_kioc            = MBOX_MAX_USER_CMDS;
 
         if ((rval = mraid_mm_register_adp(&adp)) != 0) {
@@ -3702,7 +3726,6 @@ megaraid_mbox_mm_done(adapter_t *adapter, scb_t *scb)
         unsigned long           flags;
 
         kioc                    = (uioc_t *)scb->gp;
-        kioc->status            = 0;
         mbox64                  = (mbox64_t *)(unsigned long)kioc->cmdbuf;
         mbox64->mbox32.status   = scb->status;
         raw_mbox                = (uint8_t *)&mbox64->mbox32;
diff --git a/drivers/scsi/megaraid/megaraid_mbox.h b/drivers/scsi/megaraid/megaraid_mbox.h
index 882fb1a0b575..868fb0ec93e7 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.h
+++ b/drivers/scsi/megaraid/megaraid_mbox.h
@@ -21,8 +21,8 @@
 #include "megaraid_ioctl.h"
 
 
-#define MEGARAID_VERSION        "2.20.4.7"
-#define MEGARAID_EXT_VERSION    "(Release Date: Mon Nov 14 12:27:22 EST 2005)"
+#define MEGARAID_VERSION        "2.20.4.8"
+#define MEGARAID_EXT_VERSION    "(Release Date: Mon Apr 11 12:27:22 EST 2006)"
 
 
 /*
@@ -100,6 +100,9 @@
 #define MBOX_BUSY_WAIT          10      // max usec to wait for busy mailbox
 #define MBOX_RESET_WAIT         180     // wait these many seconds in reset
 #define MBOX_RESET_EXT_WAIT     120     // extended wait reset
+#define MBOX_SYNC_WAIT_CNT      0xFFFF  // wait loop index for synchronous mode
+
+#define MBOX_SYNC_DELAY_200     200     // 200 micro-seconds
 
 /*
  * maximum transfer that can happen through the firmware commands issued