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authorNathan Fontenot <nfont@austin.ibm.com>2008-07-24 05:10:46 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-25 15:44:45 +1000
commit16c14b4621c7b6fc4611abf1f86cd78cdb1b2b03 (patch)
tree3e6ce7b3b7b040667573b019f60227c2f86c0762 /arch/powerpc/kernel/lparcfg.c
parent8391e42a5c1f3d757faa5e7f46a4a68f9aa6cb12 (diff)
powerpc/pseries: Remove kmalloc call in handling writes to lparcfg
There are only 4 valid name=value pairs for writes to /proc/ppc64/lparcfg. Current code allocates a buffer to copy this information in from the user. Since the longest name=value pair will easily fit into a buffer of 64 characters, simply put the buffer on the stack instead of allocating the buffer. Signed-off-by: Nathan Fotenot <nfont@austin.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/lparcfg.c')
-rw-r--r--arch/powerpc/kernel/lparcfg.c28
1 files changed, 12 insertions, 16 deletions
diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
index 64381a204a5..9f856a0c3e3 100644
--- a/arch/powerpc/kernel/lparcfg.c
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -573,29 +573,27 @@ static ssize_t update_mpp(u64 *entitlement, u8 *weight)
static ssize_t lparcfg_write(struct file *file, const char __user * buf,
size_t count, loff_t * off)
{
- char *kbuf;
+ int kbuf_sz = 64;
+ char kbuf[kbuf_sz];
char *tmp;
u64 new_entitled, *new_entitled_ptr = &new_entitled;
u8 new_weight, *new_weight_ptr = &new_weight;
- ssize_t retval = -ENOMEM;
+ ssize_t retval;
if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
firmware_has_feature(FW_FEATURE_ISERIES))
return -EINVAL;
- kbuf = kmalloc(count, GFP_KERNEL);
- if (!kbuf)
- goto out;
+ if (count > kbuf_sz)
+ return -EINVAL;
- retval = -EFAULT;
if (copy_from_user(kbuf, buf, count))
- goto out;
+ return -EFAULT;
- retval = -EINVAL;
kbuf[count - 1] = '\0';
tmp = strchr(kbuf, '=');
if (!tmp)
- goto out;
+ return -EINVAL;
*tmp++ = '\0';
@@ -603,32 +601,32 @@ static ssize_t lparcfg_write(struct file *file, const char __user * buf,
char *endp;
*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
if (endp == tmp)
- goto out;
+ return -EINVAL;
retval = update_ppp(new_entitled_ptr, NULL);
} else if (!strcmp(kbuf, "capacity_weight")) {
char *endp;
*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
if (endp == tmp)
- goto out;
+ return -EINVAL;
retval = update_ppp(NULL, new_weight_ptr);
} else if (!strcmp(kbuf, "entitled_memory")) {
char *endp;
*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
if (endp == tmp)
- goto out;
+ return -EINVAL;
retval = update_mpp(new_entitled_ptr, NULL);
} else if (!strcmp(kbuf, "entitled_memory_weight")) {
char *endp;
*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
if (endp == tmp)
- goto out;
+ return -EINVAL;
retval = update_mpp(NULL, new_weight_ptr);
} else
- goto out;
+ return -EINVAL;
if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
retval = count;
@@ -644,8 +642,6 @@ static ssize_t lparcfg_write(struct file *file, const char __user * buf,
retval = -EIO;
}
-out:
- kfree(kbuf);
return retval;
}