[PATCH] ide: actually honor drive's minimum PIO/DMA cycle times

The function ide_timing_compute() fails to *actually* take drive's
specified minimum PIO/DMA cycle times into account -- when doing this, it
calls ide_timing_merge() on the 'struct ide_timing' argument which contains
garbage at the moment, and then ultimately destroys the read cycle time by
quantizing the ide_timing[] entry, instead of copying from that entry to
the argument structure, and only then doing a merge/quantize.

Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Acked-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/ide/ide-timing.h

@@ -219,6 +219,12 @@ static int ide_timing_compute(ide_drive_t *drive, short speed, struct ide_timing
 	if (!(s = ide_timing_find_mode(speed)))
 		return -EINVAL;
 
+/*
+ * Copy the timing from the table.
+ */
+
+	*t = *s;
+
 /*
  * If the drive is an EIDE drive, it can tell us it needs extended
  * PIO/MWDMA cycle timing.
@@ -247,7 +253,7 @@ static int ide_timing_compute(ide_drive_t *drive, short speed, struct ide_timing
  * Convert the timing to bus clock counts.
  */
 
-	ide_timing_quantize(s, t, T, UT);
+	ide_timing_quantize(t, t, T, UT);
 
 /*
  * Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T