cciss: clean up code in cciss_shutdown

cciss: clean up code in cciss_shutdown.  Send the flush cache
command down with interrupts still enabled, and do not do DMA
from the stack.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 18 insertions, 20 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 4321c94b5525..f804542c1cf2 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -4376,30 +4376,28 @@ clean_no_release_regions:
 
 static void cciss_shutdown(struct pci_dev *pdev)
 {
-        ctlr_info_t *tmp_ptr;
-        int i;
-        char flush_buf[4];
+        ctlr_info_t *h;
+        char *flush_buf;
         int return_code;
 
-        tmp_ptr = pci_get_drvdata(pdev);
-        if (tmp_ptr == NULL)
-                return;
-        i = tmp_ptr->ctlr;
-        if (hba[i] == NULL)
+        h = pci_get_drvdata(pdev);
+        flush_buf = kzalloc(4, GFP_KERNEL);
+        if (!flush_buf) {
+                printk(KERN_WARNING
+                        "cciss:%d cache not flushed, out of memory.\n",
+                        h->ctlr);
                 return;
-
-        /* Turn board interrupts off  and send the flush cache command */
-        /* sendcmd will turn off interrupt, and send the flush...
-         * To write all data in the battery backed cache to disks */
-        memset(flush_buf, 0, 4);
-        return_code = sendcmd(CCISS_CACHE_FLUSH, i, flush_buf, 4, 0,
-                CTLR_LUNID, TYPE_CMD);
-        if (return_code == IO_OK) {
-                printk(KERN_INFO "Completed flushing cache on controller %d\n", i);
-        } else {
-                printk(KERN_WARNING "Error flushing cache on controller %d\n", i);
         }
-        free_irq(hba[i]->intr[2], hba[i]);
+        /* write all data in the battery backed cache to disk */
+        memset(flush_buf, 0, 4);
+        return_code = sendcmd_withirq(CCISS_CACHE_FLUSH, h->ctlr, flush_buf,
+                4, 0, CTLR_LUNID, TYPE_CMD);
+        kfree(flush_buf);
+        if (return_code != IO_OK)
+                printk(KERN_WARNING "cciss%d: Error flushing cache\n",
+                        h->ctlr);
+        h->access.set_intr_mask(h, CCISS_INTR_OFF);
+        free_irq(h->intr[2], h);
 }
 
 static void __devexit cciss_remove_one(struct pci_dev *pdev)