Re: SCSI breakage on non-cache coherent architectures

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From: Benjamin Herrenschmidt
Date: Tuesday, November 20, 2007 - 3:39 pm

On Tue, 2007-11-20 at 15:10 -0600, James Bottomley wrote:

Well, as I said before... it's a matter of what seems to be the less
likely to break something right ?

On one side,  I'm doing surgery on code I barely know, the scsi error
handling, and now it seems I also have to fixup a handful of drivers
that aren't the most obvious pieces of code around.

On the other side, Roland proposal is basically just adding a macro that
can be empty for everybody but a handful of archs, and stick it onto one
field in one structure...

The later has about 0 chances to actually break something or cause a
regression. I wouldn't say that about the former.

Now, I will see if I manage to fixup the NCR drivers to pass a
pre-allocated buffer (USB storage I think can pass NULL as it's not
calling prep in atomic context). But then, it complicates the matter
because that means "restore" will have to know whether prep allocated
the buffer or not, thus more fields to add to the save struct, it's
getting messy, unless we decide -all- callers are responsible for the
buffer allocation (hrm... maybe the best approach).

Ben.


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Messages in current thread:
Re: SCSI breakage on non-cache coherent architectures, David Miller, (Mon Nov 19, 1:38 am)
Re: SCSI breakage on non-cache coherent architectures, Matthew Wilcox, (Mon Nov 19, 5:32 am)
Re: SCSI breakage on non-cache coherent architectures, James Bottomley, (Mon Nov 19, 8:09 am)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 12:51 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 12:53 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 12:54 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 12:55 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 2:55 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 5:34 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 5:55 pm)
Re: SCSI breakage on non-cache coherent architectures, David Miller, (Mon Nov 19, 5:57 pm)
Re: SCSI breakage on non-cache coherent architectures, Roland Dreier, (Mon Nov 19, 7:10 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 7:35 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Mon Nov 19, 8:14 pm)
Re: SCSI breakage on non-cache coherent architectures, Thomas Bogendoerfer, (Tue Nov 20, 1:29 am)
Re: SCSI breakage on non-cache coherent architectures, James Bottomley, (Tue Nov 20, 7:36 am)
Re: SCSI breakage on non-cache coherent architectures, James Bottomley, (Tue Nov 20, 12:35 pm)
Re: SCSI breakage on non-cache coherent architectures, Roland Dreier, (Tue Nov 20, 1:05 pm)
Re: SCSI breakage on non-cache coherent architectures, James Bottomley, (Tue Nov 20, 2:10 pm)
Re: SCSI breakage on non-cache coherent architectures, Benjamin Herrenschmidt, (Tue Nov 20, 3:39 pm)
Re: SCSI breakage on non-cache coherent architectures, James Bottomley, (Tue Nov 20, 4:09 pm)