[SCSI] aacraid: interruptible ioctl

Received from Mark Salyzyn

This patch allows the FSACTL_SEND_LARGE_FIB, FSACTL_SENDFIB and
FSACTL_SEND_RAW_SRB ioctl calls into the aacraid driver to be
interruptible. Only necessary if the adapter and/or the management
software has gone into some sort of misbehavior and the system is being
rebooted, thus permitting the user management software applications to
be killed relatively cleanly. The FIB queue resource is held out of the
free queue until the adapter finally, if ever, completes the command.

Signed-off-by: Mark Haverkamp <markh@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 38 insertions, 10 deletions

diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 255421de9d1a..14d7aa9b7df3 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -38,7 +38,7 @@
 #include <linux/completion.h>
 #include <linux/dma-mapping.h>
 #include <linux/blkdev.h>
-#include <linux/delay.h>
+#include <linux/delay.h> /* ssleep prototype */
 #include <linux/kthread.h>
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
@@ -140,7 +140,8 @@ cleanup:
                 fibptr->hw_fib_pa = hw_fib_pa;
                 fibptr->hw_fib = hw_fib;
         }
-        aac_fib_free(fibptr);
+        if (retval != -EINTR)
+                aac_fib_free(fibptr);
         return retval;
 }
 
@@ -621,7 +622,13 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 
                 actual_fibsize = sizeof (struct aac_srb) + (((user_srbcmd->sg.count & 0xff) - 1) * sizeof (struct sgentry));
                 if(actual_fibsize != fibsize){ // User made a mistake - should not continue
-                        dprintk((KERN_DEBUG"aacraid: Bad Size specified in Raw SRB command\n"));
+                        dprintk((KERN_DEBUG"aacraid: Bad Size specified in "
+                          "Raw SRB command calculated fibsize=%d "
+                          "user_srbcmd->sg.count=%d aac_srb=%d sgentry=%d "
+                          "issued fibsize=%d\n",
+                          actual_fibsize, user_srbcmd->sg.count,
+                          sizeof(struct aac_srb), sizeof(struct sgentry),
+                          fibsize));
                         rcode = -EINVAL;
                         goto cleanup;
                 }
@@ -663,6 +670,10 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
                 psg->count = cpu_to_le32(sg_indx+1);
                 status = aac_fib_send(ScsiPortCommand, srbfib, actual_fibsize, FsaNormal, 1, 1, NULL, NULL);
         }
+        if (status == -EINTR) {
+                rcode = -EINTR;
+                goto cleanup;
+        }
 
         if (status != 0){
                 dprintk((KERN_DEBUG"aacraid: Could not send raw srb fib to hba\n")); 
@@ -696,8 +707,10 @@ cleanup:
         for(i=0; i <= sg_indx; i++){
                 kfree(sg_list[i]);
         }
-        aac_fib_complete(srbfib);
-        aac_fib_free(srbfib);
+        if (rcode != -EINTR) {
+                aac_fib_complete(srbfib);
+                aac_fib_free(srbfib);
+        }
 
         return rcode;
 }
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index 3f27419c66af..c67da1321133 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -464,6 +464,8 @@ int aac_fib_send(u16 command, struct fib *fibptr, unsigned long size,
         dprintk((KERN_DEBUG "  hw_fib pa being sent=%lx\n",(ulong)fibptr->hw_fib_pa));
         dprintk((KERN_DEBUG "  fib being sent=%p\n",fibptr));
 
+        if (!dev->queues)
+                return -ENODEV;
         q = &dev->queues->queue[AdapNormCmdQueue];
 
         if(wait)
@@ -527,8 +529,15 @@ int aac_fib_send(u16 command, struct fib *fibptr, unsigned long size,
                                 }
                                 udelay(5);
                         }
-                } else
-                        down(&fibptr->event_wait);
+                } else if (down_interruptible(&fibptr->event_wait)) {
+                        spin_lock_irqsave(&fibptr->event_lock, flags);
+                        if (fibptr->done == 0) {
+                                fibptr->done = 2; /* Tell interrupt we aborted */
+                                spin_unlock_irqrestore(&fibptr->event_lock, flags);
+                                return -EINTR;
+                        }
+                        spin_unlock_irqrestore(&fibptr->event_lock, flags);
+                }
                 BUG_ON(fibptr->done == 0);
                         
                 if((fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT)){
@@ -795,7 +804,7 @@ static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
 
         /* Sniff for container changes */
 
-        if (!dev)
+        if (!dev || !dev->fsa_dev)
                 return;
         container = (u32)-1;
 
diff --git a/drivers/scsi/aacraid/dpcsup.c b/drivers/scsi/aacraid/dpcsup.c
index b2a5c7262f36..8335f07b7720 100644
--- a/drivers/scsi/aacraid/dpcsup.c
+++ b/drivers/scsi/aacraid/dpcsup.c
@@ -124,10 +124,15 @@ unsigned int aac_response_normal(struct aac_queue * q)
                 } else {
                         unsigned long flagv;
                         spin_lock_irqsave(&fib->event_lock, flagv);
-                        fib->done = 1;
+                        if (!fib->done)
+                                fib->done = 1;
                         up(&fib->event_wait);
                         spin_unlock_irqrestore(&fib->event_lock, flagv);
                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
+                        if (fib->done == 2) {
+                                aac_fib_complete(fib);
+                                aac_fib_free(fib);
+                        }
                 }
                 consumed++;
                 spin_lock_irqsave(q->lock, flags);
@@ -316,7 +321,8 @@ unsigned int aac_intr_normal(struct aac_dev * dev, u32 Index)
                         unsigned long flagv;
                         dprintk((KERN_INFO "event_wait up\n"));
                         spin_lock_irqsave(&fib->event_lock, flagv);
-                        fib->done = 1;
+                        if (!fib->done)
+                                fib->done = 1;
                         up(&fib->event_wait);
                         spin_unlock_irqrestore(&fib->event_lock, flagv);
                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);