linux-kernel - Scatter-gather list constraints

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.44L0.0806201623080.2133-100000@iolanthe.rowland.org>
Date:	Fri, 20 Jun 2008 16:30:25 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Kernel development list <linux-kernel@...r.kernel.org>
cc:	AntonioLin <antonio.lin@...ormicro.com>,
	David Vrabel <david.vrabel@....com>
Subject: Scatter-gather list constraints

Is there any way to express the constraint that for a particular 
request queue, all members of a scatter-gather list (except the last) 
must be a multiple of a particular length?

This question arises in connection with wireless USB mass-storage
devices.  The controller driver requires that all DMA segments
in a transfer, other than the last one, have a multiple of 1024 bytes.  
But we're sometimes getting s-g lists where an element contains an odd
number of 512-byte sectors, and of course it doesn't work.

Thanks,

Alan Stern

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/