The patch titled
kernel/kfifo.c: add handling of chained scatterlists
has been added to the -mm tree. Its filename is
kernel-kfifoc-add-handling-of-chained-scatterlists.patch
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------------------------------------------------------
Subject: kernel/kfifo.c: add handling of chained scatterlists
From: Stefani Seibold <stefani@xxxxxxxxxxx>
The current kfifo scatterlist implementation will not work with chained
scatterlists. It assumes that struct scatterlist arrays are allocated
contiguously, which is not the case when chained scatterlists (struct
sg_table) are in use.
Signed-off-by: Stefani Seibold <stefani@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kfifo.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff -puN kernel/kfifo.c~kernel-kfifoc-add-handling-of-chained-scatterlists kernel/kfifo.c
--- a/kernel/kfifo.c~kernel-kfifoc-add-handling-of-chained-scatterlists
+++ a/kernel/kfifo.c
@@ -10,7 +10,7 @@
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
@@ -333,17 +333,16 @@ static int setup_sgl_buf(struct scatterl
buf += PAGE_SIZE;
npage = virt_to_page(buf);
if (page_to_phys(page) != page_to_phys(npage) - l) {
- sgl->page_link = 0;
- sg_set_page(sgl++, page, l - off, off);
- if (++n == nents)
+ sg_set_page(sgl, page, l - off, off);
+ sgl = sg_next(sgl);
+ if (++n == nents || sgl == NULL)
return n;
page = npage;
len -= l - off;
l = off = 0;
}
}
- sgl->page_link = 0;
- sg_set_page(sgl++, page, len, off);
+ sg_set_page(sgl, page, len, off);
return n + 1;
}
@@ -363,7 +362,7 @@ static unsigned int setup_sgl(struct __k
}
l = min(len, size - off);
- n = setup_sgl_buf(sgl, fifo->data + off, nents, l);
+ n = setup_sgl_buf(sgl, fifo->data + off, nents, l);
n += setup_sgl_buf(sgl + n, fifo->data, nents - n, len - l);
if (n)
_
Patches currently in -mm which might be from stefani@xxxxxxxxxxx are
origin.patch
kernel-kfifoc-add-handling-of-chained-scatterlists.patch
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