atascsi dma_alloc() - make atascsi play nicer with bigmem

[Kenneth R Westerback]

Another driver malloc'ing and passing potentially dma unsafe memory
to do i/o into.

ok?

.... Ken

Index: atascsi.c
===================================================================
RCS file: /cvs/src/sys/dev/ata/atascsi.c,v
retrieving revision 1.101
diff -u -p -r1.101 atascsi.c
--- atascsi.c   3 Feb 2011 21:22:19 -0000       1.101
+++ atascsi.c   2 Apr 2011 13:03:58 -0000
@@ -26,6 +26,7 @@
 #include <sys/device.h>
 #include <sys/proc.h>
 #include <sys/queue.h>
+#include <sys/pool.h>
 
 #include <scsi/scsi_all.h>
 #include <scsi/scsi_disk.h>
@@ -335,8 +336,8 @@ atascsi_probe(struct scsi_link *link)
                        xa = scsi_io_get(&ahp->ahp_iopool, SCSI_NOSLEEP);
                        if (xa == NULL)
                                panic("no free xfers on a new port");
-                       /* XXX dma reachable */
-                       identify = malloc(sizeof(*identify), M_TEMP, M_WAITOK);
+                       identify = dma_alloc(sizeof(*identify),
+                           PR_WAITOK | PR_ZERO);
                        xa->pmp_port = ap->ap_pmp_port;
                        xa->data = identify;
                        xa->datalen = sizeof(*identify);
@@ -353,10 +354,10 @@ atascsi_probe(struct scsi_link *link)
                        if (rv == 0) {
                                bcopy(identify, &ap->ap_identify,
                                    sizeof(ap->ap_identify));
-                               free(identify, M_TEMP);
+                               dma_free(identify, sizeof(*identify));
                                break;
                        }
-                       free(identify, M_TEMP);
+                       dma_free(identify, sizeof(*identify));
                        delay(5000000);
                } while (count--);