Re: [PATCH][RESUBMIT] drivers/ide/ide-probe.c, kernel 2.6.23.1

[Jonas Stare <jonas.stare@purplescout.se>]

Resubmit of IDE-probing-patch. It now checks hwif->drives[unit].present instead of
forced_geom and there is also an if-statement so it doesn't change back to the master
unless it have to. I choose to put it inside the if-statement that checks the return
code from ide_wait_not_busy, since it shouldn't revert back to the master drive unless
something is wrong and we have to leave the function. (I also left the old SELECT_DRIVE
after the for-loop so that we will select the master if everything is ok.) Inside the
if-statement or not makes not big difference until you get more than two drives on the
ide-bus...but this code should be ready for it. :)

Signed-off-by: Jonas Stare <jonas.stare@purplescout.se>

diff -u linux-2.6.23.1-orig/drivers/ide/ide-probe.c linux-2.6.23.1/drivers/ide/ide-probe.c 
--- linux-2.6.23.1-orig/drivers/ide/ide-probe.c 2007-10-12 18:43:44.000000000 +0200
+++ linux-2.6.23.1/drivers/ide/ide-probe.c      2007-11-16 10:26:23.000000000 +0100
@@ -643,6 +643,7 @@
 static int wait_hwif_ready(ide_hwif_t *hwif)
 {
        int rc;
+       int unit;
 
        printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 
@@ -659,16 +660,25 @@
                return rc;
 
        /* Now make sure both master & slave are ready */
-       SELECT_DRIVE(&hwif->drives[0]);
-       hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
-       mdelay(2);
-       rc = ide_wait_not_busy(hwif, 35000);
-       if (rc)
-               return rc;
-       SELECT_DRIVE(&hwif->drives[1]);
-       hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
-       mdelay(2);
-       rc = ide_wait_not_busy(hwif, 35000);
+       for (unit = 0; unit < MAX_DRIVES; ++unit) {
+               /* Ignore disks that we will not probe for later. */
+               if (!hwif->drives[unit].noprobe ||
+                   hwif->drives[unit].present) {
+                       SELECT_DRIVE(&hwif->drives[unit]);
+                       hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
+                       mdelay(2);
+                       rc = ide_wait_not_busy(hwif, 35000);
+                       if (rc) {
+                               /* Exit function with master reselected */
+                               if (unit != 0)
+                                       SELECT_DRIVE(&hwif->drives[0]);
+                               return rc;
+                       }
+               } else {
+                       printk(KERN_DEBUG "Skip ide_wait_not_busy for %s:%d\n",
+                               hwif->name, unit);
+               }
+       }
 
        /* Exit function with master reselected (let's be sane) */
        SELECT_DRIVE(&hwif->drives[0]);