On Oct. 18, 2007, 15:32 +0200, Jens Axboe <[EMAIL PROTECTED]> wrote: > static inline struct scatterlist *sg_next(struct scatterlist *sg) > { > - sg++; > - > - if (unlikely(sg_is_chain(sg))) > +#ifdef CONFIG_DEBUG_SG > + BUG_ON(sg->sg_magic != SG_MAGIC); > +#endif > + if (sg_is_last(sg)) > + sg = NULL; > + else if (sg_is_chain(sg)) > sg = sg_chain_ptr(sg); > + else > + sg++; >
Jens, again, please correct me if I'm wrong, but when sg points at the entry right before a chain entry this implementation of sg_next will return a pointer to the chain entry here, which I believe it must not. > return sg; > } > here's how I think sg_next should be implemented: */ static inline struct scatterlist *sg_next(struct scatterlist *sg) { +#ifdef CONFIG_DEBUG_SG + BUG_ON(sg->sg_magic != SG_MAGIC); +#endif + if (sg_is_last(sg)) + return NULL; + sg++; if (unlikely(sg_is_chain(sg))) sg = sg_chain_ptr(sg); return sg; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/