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authorThago Galesi <thiagogalesi@gmail.com>2006-04-17 17:38:15 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2006-04-17 17:38:15 +0100
commitb802c0741103aa92251d536c115874d51f802ec8 (patch)
treecf2cb539e68b224ad06b4a43350454b847543381 /drivers/mtd/mtdchar.c
parentcd2866faaa0efd9af18fe4a86d129cbd99240796 (diff)
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[PATCH] Remove unnecessary kmalloc/kfree calls in mtdchar
This patch removes repeated calls to kmalloc / kfree in mtd_write / mtd_read functions, replacing them by a single kmalloc / kfree pair. Signed-off-by: Thiago Galesi <thiagogalesi@gmail.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers/mtd/mtdchar.c')
-rw-r--r--drivers/mtd/mtdchar.c34
1 files changed, 21 insertions, 13 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 6f044584bdc..6b83aee8abb 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -170,16 +170,22 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t
/* FIXME: Use kiovec in 2.5 to lock down the user's buffers
and pass them directly to the MTD functions */
+
+ if (count > MAX_KMALLOC_SIZE)
+ kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
+ else
+ kbuf=kmalloc(count, GFP_KERNEL);
+
+ if (!kbuf)
+ return -ENOMEM;
+
while (count) {
+
if (count > MAX_KMALLOC_SIZE)
len = MAX_KMALLOC_SIZE;
else
len = count;
- kbuf=kmalloc(len,GFP_KERNEL);
- if (!kbuf)
- return -ENOMEM;
-
switch (MTD_MODE(file)) {
case MTD_MODE_OTP_FACT:
ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
@@ -215,9 +221,9 @@ static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t
return ret;
}
- kfree(kbuf);
}
+ kfree(kbuf);
return total_retlen;
} /* mtd_read */
@@ -241,18 +247,21 @@ static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count
if (!count)
return 0;
+ if (count > MAX_KMALLOC_SIZE)
+ kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
+ else
+ kbuf=kmalloc(count, GFP_KERNEL);
+
+ if (!kbuf)
+ return -ENOMEM;
+
while (count) {
+
if (count > MAX_KMALLOC_SIZE)
len = MAX_KMALLOC_SIZE;
else
len = count;
- kbuf=kmalloc(len,GFP_KERNEL);
- if (!kbuf) {
- printk("kmalloc is null\n");
- return -ENOMEM;
- }
-
if (copy_from_user(kbuf, buf, len)) {
kfree(kbuf);
return -EFAULT;
@@ -282,10 +291,9 @@ static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count
kfree(kbuf);
return ret;
}
-
- kfree(kbuf);
}
+ kfree(kbuf);
return total_retlen;
} /* mtd_write */