I tried this with a SanDisk SDDR31 and it worked fine.
On Tue, 11 May 2004, Alan Stern wrote:
> The patch below adds support to the usb-storage driver for detecting when
> a USB disk is write-protected. This support was removed several kernel
> generations ago because several devices reacted badly to it. Now I would
> like to add it back in, this time doing it the same way that Windows does
> so that it should be acceptable to the devices.
>
> Before this is merged into the kernel, though, we need to know that it
> won't cause just as many problems as the old code used to. So I'm asking
> for volunteers to test the patch with their USB disk drives and verify
> that it doesn't mess anything up. The patch ought to apply cleanly to
> 2.6.6-mm or vanilla 2.6.6.
>
> Thanks for your help!
>
> Alan Stern
>
>
>
> ===== drivers/usb/storage/scsiglue.c 1.73 vs edited =====
> --- 1.73/drivers/usb/storage/scsiglue.c Wed Apr 14 13:12:47 2004
> +++ edited/drivers/usb/storage/scsiglue.c Mon Apr 26 11:50:21 2004
> @@ -48,6 +48,7 @@
> #include "usb.h"
> #include "debug.h"
> #include "transport.h"
> +#include "protocol.h"
>
> #include <linux/slab.h>
> #include <linux/module.h>
> @@ -70,8 +71,17 @@
> * Set default bflags. These can be overridden for individual
> * models and vendors via the scsi devinfo mechanism.
> */
> - sdev->sdev_bflags = (BLIST_MS_SKIP_PAGE_08 | BLIST_MS_SKIP_PAGE_3F |
> - BLIST_USE_10_BYTE_MS);
> +
> + /* By default, USB mass storage devices use MODE SENSE(10).
> + * By default, use 192 byte transfers for MODE SENSE with page=x3f.
> + * We don't know how reliable MODE SENSE page x08 is, so for
> + * now skip it by default.
> + sdev->sdev_bflags = (BLIST_USE_10_BYTE_MS |
> + BLIST_MS_192_BYTES_FOR_3F |
> + BLIST_MS_SKIP_PAGE_08);
> + /* Maybe add an unusual_devs flag for BLIST_MS_SKIP_PAGE_3F if
> + * too many devices fail to support it. */
> +
> return 0;
> }
>
> @@ -99,7 +109,24 @@
> us->pusb_dev->speed == USB_SPEED_HIGH)
> blk_queue_max_sectors(sdev->request_queue, 128);
>
> - /* this is to satisify the compiler, tho I don't think the
> + /* We can't put these settings in slave_alloc() because that gets
> + * called before the device type is known. Consequently these
> + * settings can't be overridden via the scsi devinfo mechanism. */
> + if (sdev->type == TYPE_DISK) {
> +
> + /* Disk-type devices use MODE SENSE(6) if the protocol
> + * (SubClass) is Transparent SCSI */
> + if (us->subclass == US_SC_SCSI)
> + sdev->use_10_for_ms = 0;
> + } else {
> +
> + /* Non-disk-type devices don't need to blacklist page x08
> + * or to force 192 byte transfer lengths for MODE SENSE. */
> + sdev->skip_ms_page_8 = 0;
> + sdev->use_192_bytes_for_3f = 0;
> + }
> +
> + /* this is to satisfy the compiler, tho I don't think the
> * return code is ever checked anywhere. */
> return 0;
> }
>
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by Sleepycat Software
> Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to
> deliver higher performing products faster, at low TCO.
> http://www.sleepycat.com/telcomwpreg.php?From=osdnemail3
> _______________________________________________
> [EMAIL PROTECTED]
> To unsubscribe, use the last form field at:
> https://lists.sourceforge.net/lists/listinfo/linux-usb-users
>
--
/------------------------------------+-------------------------\
|Stephen J. Gowdy | SLAC, MailStop 34, |
|http://www.slac.stanford.edu/~gowdy/ | 2575 Sand Hill Road, |
|http://calendar.yahoo.com/gowdy | Menlo Park CA 94025, USA |
|EMail: [EMAIL PROTECTED] | Tel: +1 650 926 3144 |
\------------------------------------+-------------------------/
-------------------------------------------------------
This SF.Net email is sponsored by Sleepycat Software
Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to
deliver higher performing products faster, at low TCO.
http://www.sleepycat.com/telcomwpreg.php?From=osdnemail3
_______________________________________________
[EMAIL PROTECTED]
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-users
