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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-07-23 19:55:56 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-07-23 19:55:56 +0200
commit3b2a5c7149ee4af4aff8fee953f66fc846d92cea (patch)
treebac123edeab61a491625fe42fca8e37e699bf84b /include/linux/ide.h
parentc30daac190de23779090c645e680c7977377032c (diff)
ide: filter out "default" transfer mode values in set_xfer_rate()
* Filter out "default" transfer mode values (0x00 - default PIO mode, 0x01 - default PIO mode w/ IORDY disabled) in write handler for obsoleted /proc/ide/hd?/settings:current_speed setting. Allowing "default" transfer mode values is a dangerous thing to do as we don't support programming controller to the "default" transfer mode and devices often use different values for the default and maximum PIO mode (i.e. PIO2 default and PIO4 maximum) so the controller will stay programmed for higher PIO mode while device will use the lower PIO mode. There is no functionality loss as by using special IOCTLs device can still be programmed to "default" transfer modes (it is only useful for debugging/testing purposes anyway). * Remove no longer needed IDE_HFLAG_ABUSE_SET_DMA_MODE host flag, it was previously used by few host drivers to program the controller to PIO0 timings for "default" transfer mode == 0x01 (although some host drivers would program invalid PIO timings instead). * Cleanup ide_set_xfer_rate() and add BUG_ON(). Suggested-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'include/linux/ide.h')
-rw-r--r--include/linux/ide.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 3f288940025..260e871ae88 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1085,7 +1085,6 @@ enum {
IDE_HFLAG_IO_32BIT = (1 << 24),
/* unmask IRQs */
IDE_HFLAG_UNMASK_IRQS = (1 << 25),
- IDE_HFLAG_ABUSE_SET_DMA_MODE = (1 << 26),
/* serialize ports if DMA is possible (for sl82c105) */
IDE_HFLAG_SERIALIZE_DMA = (1 << 27),
/* force host out of "simplex" mode */