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authorMandeep Singh Baines <msb@google.com>2008-04-16 06:24:17 +0400
committerDavid S. Miller <davem@davemloft.net>2008-04-16 06:29:17 +0400
commitb131dd5d659aaf287a3809473130c3ff5eddb71b (patch)
treea65425bc2a4119b0e668dafa528d1f4e0286ff40 /net
parent73e87e02ec484ac459c4be262ab76960b89dc019 (diff)
downloadlinux-b131dd5d659aaf287a3809473130c3ff5eddb71b.tar.xz
[ETHTOOL]: Add support for large eeproms
Currently, it is not possible to read/write to an eeprom larger than 128k in size because the buffer used for temporarily storing the eeprom contents is allocated using kmalloc. kmalloc can only allocate a maximum of 128k depending on architecture. Modified ethtool_get/set_eeprom to only allocate a page of memory and then copy the eeprom a page at a time. Updated original patch as per suggestions from Joe Perches. Signed-off-by: Mandeep Singh Baines <msb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/ethtool.c64
1 files changed, 36 insertions, 28 deletions
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 1163eb2256d0..a29b43d0b450 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -284,8 +284,10 @@ static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
{
struct ethtool_eeprom eeprom;
const struct ethtool_ops *ops = dev->ethtool_ops;
+ void __user *userbuf = useraddr + sizeof(eeprom);
+ u32 bytes_remaining;
u8 *data;
- int ret;
+ int ret = 0;
if (!ops->get_eeprom || !ops->get_eeprom_len)
return -EOPNOTSUPP;
@@ -301,26 +303,26 @@ static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
return -EINVAL;
- data = kmalloc(eeprom.len, GFP_USER);
+ data = kmalloc(PAGE_SIZE, GFP_USER);
if (!data)
return -ENOMEM;
- ret = -EFAULT;
- if (copy_from_user(data, useraddr + sizeof(eeprom), eeprom.len))
- goto out;
-
- ret = ops->get_eeprom(dev, &eeprom, data);
- if (ret)
- goto out;
+ bytes_remaining = eeprom.len;
+ while (bytes_remaining > 0) {
+ eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
- ret = -EFAULT;
- if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
- goto out;
- if (copy_to_user(useraddr + sizeof(eeprom), data, eeprom.len))
- goto out;
- ret = 0;
+ ret = ops->get_eeprom(dev, &eeprom, data);
+ if (ret)
+ break;
+ if (copy_to_user(userbuf, data, eeprom.len)) {
+ ret = -EFAULT;
+ break;
+ }
+ userbuf += eeprom.len;
+ eeprom.offset += eeprom.len;
+ bytes_remaining -= eeprom.len;
+ }
- out:
kfree(data);
return ret;
}
@@ -329,8 +331,10 @@ static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
{
struct ethtool_eeprom eeprom;
const struct ethtool_ops *ops = dev->ethtool_ops;
+ void __user *userbuf = useraddr + sizeof(eeprom);
+ u32 bytes_remaining;
u8 *data;
- int ret;
+ int ret = 0;
if (!ops->set_eeprom || !ops->get_eeprom_len)
return -EOPNOTSUPP;
@@ -346,22 +350,26 @@ static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
return -EINVAL;
- data = kmalloc(eeprom.len, GFP_USER);
+ data = kmalloc(PAGE_SIZE, GFP_USER);
if (!data)
return -ENOMEM;
- ret = -EFAULT;
- if (copy_from_user(data, useraddr + sizeof(eeprom), eeprom.len))
- goto out;
-
- ret = ops->set_eeprom(dev, &eeprom, data);
- if (ret)
- goto out;
+ bytes_remaining = eeprom.len;
+ while (bytes_remaining > 0) {
+ eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);
- if (copy_to_user(useraddr + sizeof(eeprom), data, eeprom.len))
- ret = -EFAULT;
+ if (copy_from_user(data, userbuf, eeprom.len)) {
+ ret = -EFAULT;
+ break;
+ }
+ ret = ops->set_eeprom(dev, &eeprom, data);
+ if (ret)
+ break;
+ userbuf += eeprom.len;
+ eeprom.offset += eeprom.len;
+ bytes_remaining -= eeprom.len;
+ }
- out:
kfree(data);
return ret;
}