PRD_ENTRIES is 256

[William Lee Irwin III]

PRD_ENTRIES is specified to be precisely 256; on platforms where
PAGE_SIZE varies from 4KB the calculation in the current expression
defining it is inaccurate, which may cause crashes. This patch changes
it to the constant literal 256.


-- wli


===== include/linux/ide.h 1.88 vs edited =====
--- 1.88/include/linux/ide.h	Tue Feb 10 07:35:39 2004
+++ edited/include/linux/ide.h	Wed Feb 25 01:46:45 2004
@@ -224,7 +224,7 @@
  * allowing each to have about 256 entries (8 bytes each) from this.
  */
 #define PRD_BYTES       8
-#define PRD_ENTRIES     (PAGE_SIZE / (2 * PRD_BYTES))
+#define PRD_ENTRIES     256
 
 /*
  * Some more useful definitions
-
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