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Date: Tue, 24 Oct 2006 21:58:32 +0200 From: Arnd Bergmann <arnd@...db.de> To: will_schmidt@...t.ibm.com Cc: Pekka Enberg <penberg@...helsinki.fi>, linuxppc-dev@...abs.org, Paul Mackerras <paulus@...ba.org>, cbe-oss-dev@...abs.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/3] spufs: fix another off-by-one bug in mbox_read On Tuesday 24 October 2006 21:53, Will Schmidt wrote: > Hey Arnd, > just curiosity.. What was the behavior before this patch? just > leaving a few (0 - 3) characters behind? It transfers more bytes than requested on a read. If you asked for four bytes, you got eight. Note: one nasty property of this file in spufs is that you can only read multiples of four bytes in the first place, there is no way to atomically put back a few bytes into the hardware register, so reading less than four bytes returns -EINVAL. Asking for more than four should return the largest possible multiple of four. Arnd <>< - 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/
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