From 4eee6a3a04e8bb53fbe7de0f64d0524d3fbe3f80 Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Mon, 26 Mar 2012 09:01:30 +0000 Subject: wimax: i2400m - prevent a possible kernel bug due to missing fw_name string This happened on a machine with a custom hotplug script calling nameif, probably due to slow firmware loading. At the time nameif uses ethtool to gather interface information, i2400m->fw_name is zero and so a null pointer dereference occurs from within i2400m_get_drvinfo(). Signed-off-by: Phil Sutter Signed-off-by: David S. Miller --- drivers/net/wimax/i2400m/netdev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/net/wimax/i2400m') diff --git a/drivers/net/wimax/i2400m/netdev.c b/drivers/net/wimax/i2400m/netdev.c index 63e4b709efa9..1d76ae855f07 100644 --- a/drivers/net/wimax/i2400m/netdev.c +++ b/drivers/net/wimax/i2400m/netdev.c @@ -597,7 +597,8 @@ static void i2400m_get_drvinfo(struct net_device *net_dev, struct i2400m *i2400m = net_dev_to_i2400m(net_dev); strncpy(info->driver, KBUILD_MODNAME, sizeof(info->driver) - 1); - strncpy(info->fw_version, i2400m->fw_name, sizeof(info->fw_version) - 1); + strncpy(info->fw_version, + i2400m->fw_name ? : "", sizeof(info->fw_version) - 1); if (net_dev->dev.parent) strncpy(info->bus_info, dev_name(net_dev->dev.parent), sizeof(info->bus_info) - 1); -- cgit v1.2.3 From b7440892802be38e6eeb0a17897deeb85476eff4 Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Mon, 26 Mar 2012 09:01:31 +0000 Subject: wimax: i2400m-usb - use a private struct ethtool_ops This way the USB variant of the driver uses usb_make_path in order to provide bus-info compatible to other USB drivers (like e.g. asix.c). Signed-off-by: Phil Sutter Signed-off-by: David S. Miller --- drivers/net/wimax/i2400m/usb.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'drivers/net/wimax/i2400m') diff --git a/drivers/net/wimax/i2400m/usb.c b/drivers/net/wimax/i2400m/usb.c index 2c1b8b687646..29b1e033a10b 100644 --- a/drivers/net/wimax/i2400m/usb.c +++ b/drivers/net/wimax/i2400m/usb.c @@ -339,6 +339,23 @@ int i2400mu_bus_reset(struct i2400m *i2400m, enum i2400m_reset_type rt) return result; } +static void i2400mu_get_drvinfo(struct net_device *net_dev, + struct ethtool_drvinfo *info) +{ + struct i2400m *i2400m = net_dev_to_i2400m(net_dev); + struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m); + struct usb_device *udev = i2400mu->usb_dev; + + strncpy(info->driver, KBUILD_MODNAME, sizeof(info->driver) - 1); + strncpy(info->fw_version, + i2400m->fw_name ? : "", sizeof(info->fw_version) - 1); + usb_make_path(udev, info->bus_info, sizeof(info->bus_info)); +} + +static const struct ethtool_ops i2400mu_ethtool_ops = { + .get_drvinfo = i2400mu_get_drvinfo, + .get_link = ethtool_op_get_link, +}; static void i2400mu_netdev_setup(struct net_device *net_dev) @@ -347,6 +364,7 @@ void i2400mu_netdev_setup(struct net_device *net_dev) struct i2400mu *i2400mu = container_of(i2400m, struct i2400mu, i2400m); i2400mu_init(i2400mu); i2400m_netdev_setup(net_dev); + net_dev->ethtool_ops = &i2400mu_ethtool_ops; } -- cgit v1.2.3 From 234e340582901211f40d8c732afc49f0630ecf05 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Thu, 5 Apr 2012 14:25:11 -0700 Subject: simple_open: automatically convert to simple_open() Many users of debugfs copy the implementation of default_open() when they want to support a custom read/write function op. This leads to a proliferation of the default_open() implementation across the entire tree. Now that the common implementation has been consolidated into libfs we can replace all the users of this function with simple_open(). This replacement was done with the following semantic patch: @ open @ identifier open_f != simple_open; identifier i, f; @@ -int open_f(struct inode *i, struct file *f) -{ ( -if (i->i_private) -f->private_data = i->i_private; | -f->private_data = i->i_private; ) -return 0; -} @ has_open depends on open @ identifier fops; identifier open.open_f; @@ struct file_operations fops = { ... -.open = open_f, +.open = simple_open, ... }; [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: Stephen Boyd Cc: Greg Kroah-Hartman Cc: Al Viro Cc: Julia Lawall Acked-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/net/wimax/i2400m/debugfs.c | 15 ++------------- 1 file changed, 2 insertions(+), 13 deletions(-) (limited to 'drivers/net/wimax/i2400m') diff --git a/drivers/net/wimax/i2400m/debugfs.c b/drivers/net/wimax/i2400m/debugfs.c index 129ba36bd04d..4b66ab1d0e5c 100644 --- a/drivers/net/wimax/i2400m/debugfs.c +++ b/drivers/net/wimax/i2400m/debugfs.c @@ -53,17 +53,6 @@ struct dentry *debugfs_create_netdev_queue_stopped( &fops_netdev_queue_stopped); } - -/* - * inode->i_private has the @data argument to debugfs_create_file() - */ -static -int i2400m_stats_open(struct inode *inode, struct file *filp) -{ - filp->private_data = inode->i_private; - return 0; -} - /* * We don't allow partial reads of this file, as then the reader would * get weirdly confused data as it is updated. @@ -117,7 +106,7 @@ ssize_t i2400m_rx_stats_write(struct file *filp, const char __user *buffer, static const struct file_operations i2400m_rx_stats_fops = { .owner = THIS_MODULE, - .open = i2400m_stats_open, + .open = simple_open, .read = i2400m_rx_stats_read, .write = i2400m_rx_stats_write, .llseek = default_llseek, @@ -170,7 +159,7 @@ ssize_t i2400m_tx_stats_write(struct file *filp, const char __user *buffer, static const struct file_operations i2400m_tx_stats_fops = { .owner = THIS_MODULE, - .open = i2400m_stats_open, + .open = simple_open, .read = i2400m_tx_stats_read, .write = i2400m_tx_stats_write, .llseek = default_llseek, -- cgit v1.2.3