On Tue, 2007-10-02 at 20:15 +0200, Adrian Bunk wrote:
> Cc's added, the complete bug report is at
> http://lkml.org/lkml/2007/10/2/243
>
> On Tue, Oct 02, 2007 at 12:48:26PM -0400, Burton Windle wrote:
> > 2.6.23-rc9 fails to boot for me; 2.6.22.9 works fine.
> >
> > System is a Dell Poweredge with PERC 2/DC with RAID1 volume.
> >...
>
> Thanks for your report.
>
> Diff'ing the dmesg's shows:
>
> <-- snip -->
>
> scsi0: scanning scsi channel 4 [P0] for physical devices.
> scsi0: scanning scsi channel 5 [P1] for physical devices.
> st: Version 20070203, fixed bufsize 32768, s/g segs 256
> -sd 0:0:0:0: [sda] 17547264 512-byte hardware sectors (8984 MB)
> +sd 0:0:0:0: [sda] Sector size 0 reported, assuming 512.
> +sd 0:0:0:0: [sda] 1 512-byte hardware sectors (0 MB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Asking for cache data failed
> sd 0:0:0:0: [sda] Assuming drive cache: write through
> -sd 0:0:0:0: [sda] 17547264 512-byte hardware sectors (8984 MB)
> +sd 0:0:0:0: [sda] Sector size 0 reported, assuming 512.
> +sd 0:0:0:0: [sda] 1 512-byte hardware sectors (0 MB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Asking for cache data failed
> sd 0:0:0:0: [sda] Assuming drive cache: write through
> sda: sda1
> + sda: p1 exceeds device capacity
>
> <-- snip -->
>
> - case MEGA_BULK_DATA:
> - if (scb->cmd->use_sg == 0)
> - length = scb->cmd->request_bufflen;
> - else {
> - struct scatterlist *sgl =
> - (struct scatterlist *)scb->cmd->request_buffer;
> - length = sgl->length;
> - }
> - pci_unmap_page(adapter->dev, scb->dma_h_bulkdata,
> - length, scb->dma_direction);
> - break;
> -
This is the problem piece I think. We've reintroduced a very old bug:
commit 51c928c34fa7cff38df584ad01de988805877dba
Author: James Bottomley <[email protected]>
Date: Sat Oct 1 09:38:05 2005 -0500
[SCSI] Legacy MegaRAID: Fix READ CAPACITY
Some Legacy megaraid cards can't actually cope with the scatter/gather
version of the READ CAPACITY command (which is what we now send them
since altering all SCSI internal I/O to go via the block layer). Fix
this (and a few other broken megaraid driver assumptions) by sending
the non-sg version of the command if the sg list only has a single
element.
Signed-off-by: James Bottomley <[email protected]>
So what we have to do is put back the check for use_sg == 1 and send
that as a bulk transfer command.
James
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