Hi,
Nowadays, you can dynamically change driver bound to a device using
sysfs and it works just fine for IDE, ie:
echo -n "1.0" > /sys/bus/ide/drivers/ide-scsi/unbind
echo -n "1.0" > /sys/bus/ide/drivers/ide-cdrom/bind
to unbind /dev/hdc from ide-scsi and bind to ide-cdrom
That was one of the main goals behind my old patches to convert
IDE device drivers to device-model.
Please don't add another module parameter for controlling driver binding
and making it more complicated than already is:
* "hdx=scsi" kernel parameter
* "hdx=driver" kernel parameter
* /proc/ide/hd?/driver interface
* ide_cd and "ignore" parameter
(actually all the above can go away).
Bart
On 11/29/06, Alan <alan@xxxxxxxxxxxxxxxxxxx> wrote:
Some people want to use ide_cd for CD-ROM but still dynamically load
ide-scsi for things like tape drives. If you compile in the CD driver
this works out but if you want them modular you need an option to ensure
that whoever loads first the right things happen.
This replaces the original draft patch which leaked a scsi host reference
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
diff -u --exclude-from /usr/src/exclude --new-file --recursive linux.vanilla-2.6.19-rc6-mm1/drivers/scsi/ide-scsi.c linux-2.6.19-rc6-mm1/drivers/scsi/ide-scsi.c
--- linux.vanilla-2.6.19-rc6-mm1/drivers/scsi/ide-scsi.c 2006-11-24 13:58:08.000000000 +0000
+++ linux-2.6.19-rc6-mm1/drivers/scsi/ide-scsi.c 2006-11-29 14:18:12.000000000 +0000
@@ -110,6 +110,7 @@
} idescsi_scsi_t;
static DEFINE_MUTEX(idescsi_ref_mutex);
+static int idescsi_nocd; /* Set by module param to skip cd */
#define ide_scsi_g(disk) \
container_of((disk)->private_data, struct ide_scsi_obj, driver)
@@ -1127,11 +1128,14 @@
warned = 1;
}
+ if (idescsi_nocd && drive->media == ide_cdrom)
+ return -ENODEV;
+
if (!strstr("ide-scsi", drive->driver_req) ||
!drive->present ||
drive->media == ide_disk ||
!(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
return -ENODEV;
g = alloc_disk(1 << PARTN_BITS);
if (!g)
@@ -1187,6 +1192,7 @@
driver_unregister(&idescsi_driver.gen_driver);
}
+module_param(idescsi_nocd, int, 0600);
module_init(init_idescsi_module);
module_exit(exit_idescsi_module);
MODULE_LICENSE("GPL");
-
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