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authorArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2011-12-30 15:57:25 +0200
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-01-09 18:26:05 +0000
commit52b020317f65114eeba2ee2cfa70a51a286f1d8a (patch)
treea7b071413221fef69cc8b2c2a55cb1a6ba305298
parent4ccf2f1349e681401b5fae73efc87b8d2d70ce0e (diff)
mtd: clean-up the default_mtd_writev function
1. Teach 'mtd_write()' function to return '-EROFS' if the write method is undefined, and remove the corresponding check from 'default_mtd_writev()'. 2. Do not test 'retlen' for NULL - it cannot be NULL. 3. Few minor coding stile clean-ups. 4. Add a kerneldoc comment Additionally, minor fixes to the kerneldoc comments of the neighbor function. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/mtd/mtdcore.c41
-rw-r--r--include/linux/mtd/mtd.h2
2 files changed, 24 insertions, 19 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 8bea2d0fdb20..85a3f197e7f0 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -683,10 +683,17 @@ void __put_mtd_device(struct mtd_info *mtd)
module_put(mtd->owner);
}
-/* default_mtd_writev - default mtd writev method for MTD devices that
- * don't implement their own
+/*
+ * default_mtd_writev - the default writev method
+ * @mtd: mtd device description object pointer
+ * @vecs: the vectors to write
+ * @count: count of vectors in @vecs
+ * @to: the MTD device offset to write to
+ * @retlen: on exit contains the count of bytes written to the MTD device.
+ *
+ * This function returns zero in case of success and a negative error code in
+ * case of failure.
*/
-
int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen)
{
@@ -694,28 +701,24 @@ int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
size_t totlen = 0, thislen;
int ret = 0;
- if(!mtd->write) {
- ret = -EROFS;
- } else {
- for (i=0; i<count; i++) {
- if (!vecs[i].iov_len)
- continue;
- ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen,
- vecs[i].iov_base);
- totlen += thislen;
- if (ret || thislen != vecs[i].iov_len)
- break;
- to += vecs[i].iov_len;
- }
+ for (i = 0; i < count; i++) {
+ if (!vecs[i].iov_len)
+ continue;
+ ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen,
+ vecs[i].iov_base);
+ totlen += thislen;
+ if (ret || thislen != vecs[i].iov_len)
+ break;
+ to += vecs[i].iov_len;
}
- if (retlen)
- *retlen = totlen;
+ *retlen = totlen;
return ret;
}
/**
* mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size
- * @size: A pointer to the ideal or maximum size of the allocation. Points
+ * @mtd: mtd device description object pointer
+ * @size: a pointer to the ideal or maximum size of the allocation, points
* to the actual allocation size on success.
*
* This routine attempts to allocate a contiguous kernel buffer up to
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 671c89289fc3..f0dd5a305b89 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -291,6 +291,8 @@ static inline int mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
*retlen = 0;
+ if (!mtd->write)
+ return -EROFS;
return mtd->write(mtd, to, len, retlen, buf);
}