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Remove stale comment
There's no useracc here, and even if there was it shouldn't be here. vmapbuf is sufficient and as the comment says, useracc is racy.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=359901
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@ -971,14 +971,7 @@ cam_periph_mapmem(union ccb *ccb, struct cam_periph_map_info *mapinfo,
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mapinfo->bp[i]->b_iocmd = (dirs[i] == CAM_DIR_OUT) ?
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BIO_WRITE : BIO_READ;
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/*
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* Map the buffer into kernel memory.
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*
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* Note that useracc() alone is not a sufficient test.
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* vmapbuf() can still fail due to a smaller file mapped
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* into a larger area of VM, or if userland races against
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* vmapbuf() after the useracc() check.
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*/
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/* Map the buffer into kernel memory. */
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if (vmapbuf(mapinfo->bp[i], 1) < 0) {
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uma_zfree(pbuf_zone, mapinfo->bp[i]);
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goto fail;
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