From: Jens Axboe <axboe@suse.de>
Print a runtime warning if ide-scsi is used on a cd device.
Modify the ide-scsi menuconfig help to reflect that ide-scsi should
not be used for cd burning.
drivers/ide/Kconfig | 10 +++++++---
drivers/scsi/ide-scsi.c | 6 ++++++
2 files changed, 13 insertions(+), 3 deletions(-)
diff -puN drivers/ide/Kconfig~ide-scsi-warnings drivers/ide/Kconfig
--- 25/drivers/ide/Kconfig~ide-scsi-warnings 2003-11-08 13:08:23.000000000 -0800
+++ 25-akpm/drivers/ide/Kconfig 2003-11-08 13:08:23.000000000 -0800
@@ -249,12 +249,17 @@ config BLK_DEV_IDESCSI
tristate "SCSI emulation support"
depends on SCSI
---help---
+ WARNING: ide-scsi is no longer needed for cd writing applications!
+ The 2.6 kernel supports direct writing to ide-cd, which eliminates
+ the need for ide-scsi + the entire scsi stack just for writing a
+ cd. The new method is more efficient in every way.
+
This will provide SCSI host adapter emulation for IDE ATAPI devices,
and will allow you to use a SCSI device driver instead of a native
ATAPI driver.
This is useful if you have an ATAPI device for which no native
- driver has been written (for example, an ATAPI PD-CD or CDR drive);
+ driver has been written (for example, an ATAPI PD-CD drive);
you can then use this emulation together with an appropriate SCSI
device driver. In order to do this, say Y here and to "SCSI support"
and "SCSI generic support", below. You must then provide the kernel
@@ -262,8 +267,7 @@ config BLK_DEV_IDESCSI
documentation of your boot loader (lilo or loadlin) about how to
pass options to the kernel at boot time) for devices if you want the
native EIDE sub-drivers to skip over the native support, so that
- this SCSI emulation can be used instead. This is required for use of
- CD-RW's.
+ this SCSI emulation can be used instead.
Note that this option does NOT allow you to attach SCSI devices to a
box that doesn't have a SCSI host adapter installed.
diff -puN drivers/scsi/ide-scsi.c~ide-scsi-warnings drivers/scsi/ide-scsi.c
--- 25/drivers/scsi/ide-scsi.c~ide-scsi-warnings 2003-11-08 13:08:23.000000000 -0800
+++ 25-akpm/drivers/scsi/ide-scsi.c 2003-11-08 13:08:23.000000000 -0800
@@ -949,8 +949,14 @@ static int idescsi_attach(ide_drive_t *d
{
idescsi_scsi_t *idescsi;
struct Scsi_Host *host;
+ static int warned;
int err;
+ if (!warned && drive->media == ide_cdrom) {
+ printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
+ warned = 1;
+ }
+
if (!strstr("ide-scsi", drive->driver_req) ||
!drive->present ||
drive->media == ide_disk ||
_