Re: BUG: SCSI: usb storage SDHC card doesn't work in 2.6.27-rc1

Alan Stern
2008-07-30T14:16:05Z

On Tue, 29 Jul 2008, James Bottomley wrote:

> > Summary:
> > Between 2.6.26-rc9-git10 and rc9-git11, the kernel stopped properly
> > recognizing my USB-card-reader-mounted SDHC 4GB card. The problem seems to
> > come up between usb-storage recognizing the device, and the handoff to scsi
> > to read the disk properties. The bug remains in 2.6.26 and 2.6.27-rc1;
> > kernels before 2.6.26-rc9-git10 are unaffected. On the same EHCI controller,
> > an old-spec SD 1GB card and its reader are unaffected by this bug.

> > After the bug, initialization looks the same until the device scan finishes.
> > Handoff to scsi produces the following (taken from rc9-git12):

> > sd 5:0:0:0: [sdf] Sector size 0 reported, assuming 512.
> > sd 5:0:0:0: [sdf] 1 512-byte hardware sectors (0 MB)
> > sd 5:0:0:0: [sdf] Write Protect is off
> > sd 5:0:0:0: [sdf] Mode Sense: 4b 00 00 08
> > sd 5:0:0:0: [sdf] Assuming drive cache: write through
> > sd 5:0:0:0: [sdf] Sector size 0 reported, assuming 512.
> > sd 5:0:0:0: [sdf] 1 512-byte hardware sectors (0 MB)
> > sd 5:0:0:0: [sdf] Write Protect is off
> > sd 5:0:0:0: [sdf] Mode Sense: 4b 00 00 08
> > sd 5:0:0:0: [sdf] Assuming drive cache: write through
> > sdf: sdf1
> > sdf: p1 exceeds device capacity
> > sd 5:0:0:0: [sdf] Attached SCSI removable disk
> > sd 5:0:0:0: Attached scsi generic sg7 type 0

The problem will most likely be fixed by this patch:

http://marc.info/?l=linux-usb&m=121734710306509&w=2

Alan Stern