llseek: automatically add .llseek fop

All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.

The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.

New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time.  Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.

The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.

Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.

Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.

===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
//   but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}

@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}

@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
   *off = E
|
   *off += E
|
   func(..., off, ...)
|
   E = *off
)
...+>
}

@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}

@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
  *off = E
|
  *off += E
|
  func(..., off, ...)
|
  E = *off
)
...+>
}

@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}

@ fops0 @
identifier fops;
@@
struct file_operations fops = {
 ...
};

@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
 .llseek = llseek_f,
...
};

@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
 .read = read_f,
...
};

@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
 .write = write_f,
...
};

@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
 .open = open_f,
...
};

// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
...  .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};

@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
...  .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};

// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
...  .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};

// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};

// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};

@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+	.llseek = default_llseek, /* write accesses f_pos */
};

// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////

@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
 .write = write_f,
 .read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};

@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};

@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};

@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>

13 files changed, 72 insertions, 23 deletions

diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index 1d05445d4ba3..ce77575e88b3 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -4430,21 +4430,24 @@ static const struct file_operations proc_statsdelta_ops = {
 	.owner		= THIS_MODULE,
 	.read		= proc_read,
 	.open		= proc_statsdelta_open,
-	.release	= proc_close
+	.release	= proc_close,
+	.llseek		= default_llseek,
 };
 
 static const struct file_operations proc_stats_ops = {
 	.owner		= THIS_MODULE,
 	.read		= proc_read,
 	.open		= proc_stats_open,
-	.release	= proc_close
+	.release	= proc_close,
+	.llseek		= default_llseek,
 };
 
 static const struct file_operations proc_status_ops = {
 	.owner		= THIS_MODULE,
 	.read		= proc_read,
 	.open		= proc_status_open,
-	.release	= proc_close
+	.release	= proc_close,
+	.llseek		= default_llseek,
 };
 
 static const struct file_operations proc_SSID_ops = {
@@ -4452,7 +4455,8 @@ static const struct file_operations proc_SSID_ops = {
 	.read		= proc_read,
 	.write		= proc_write,
 	.open		= proc_SSID_open,
-	.release	= proc_close
+	.release	= proc_close,
+	.llseek		= default_llseek,
 };
 
 static const struct file_operations proc_BSSList_ops = {
@@ -4460,7 +4464,8 @@ static const struct file_operations proc_BSSList_ops = {
 	.read		= proc_read,
 	.write		= proc_write,
 	.open		= proc_BSSList_open,
-	.release	= proc_close
+	.release	= proc_close,
+	.llseek		= default_llseek,
 };
 
 static const struct file_operations proc_APList_ops = {
@@ -4468,7 +4473,8 @@ static const struct file_operations proc_APList_ops = {
 	.read		= proc_read,
 	.write		= proc_write,
 	.open		= proc_APList_open,
-	.release	= proc_close
+	.release	= proc_close,
+	.llseek		= default_llseek,
 };
 
 static const struct file_operations proc_config_ops = {
@@ -4476,7 +4482,8 @@ static const struct file_operations proc_config_ops = {
 	.read		= proc_read,
 	.write		= proc_write,
 	.open		= proc_config_open,
-	.release	= proc_close
+	.release	= proc_close,
+	.llseek		= default_llseek,
 };
 
 static const struct file_operations proc_wepkey_ops = {
@@ -4484,7 +4491,8 @@ static const struct file_operations proc_wepkey_ops = {
 	.read		= proc_read,
 	.write		= proc_write,
 	.open		= proc_wepkey_open,
-	.release	= proc_close
+	.release	= proc_close,
+	.llseek		= default_llseek,
 };
 
 static struct proc_dir_entry *airo_entry;
diff --git a/drivers/net/wireless/ath/ath5k/debug.c b/drivers/net/wireless/ath/ath5k/debug.c
index 4cccc29964f6..fb339c3852ee 100644
--- a/drivers/net/wireless/ath/ath5k/debug.c
+++ b/drivers/net/wireless/ath/ath5k/debug.c
@@ -271,6 +271,7 @@ static const struct file_operations fops_beacon = {
 	.write = write_file_beacon,
 	.open = ath5k_debugfs_open,
 	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
@@ -290,6 +291,7 @@ static const struct file_operations fops_reset = {
 	.write = write_file_reset,
 	.open = ath5k_debugfs_open,
 	.owner = THIS_MODULE,
+	.llseek = noop_llseek,
 };
 
 
@@ -369,6 +371,7 @@ static const struct file_operations fops_debug = {
 	.write = write_file_debug,
 	.open = ath5k_debugfs_open,
 	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
@@ -480,6 +483,7 @@ static const struct file_operations fops_antenna = {
 	.write = write_file_antenna,
 	.open = ath5k_debugfs_open,
 	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
@@ -591,6 +595,7 @@ static const struct file_operations fops_frameerrors = {
 	.write = write_file_frameerrors,
 	.open = ath5k_debugfs_open,
 	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
@@ -748,6 +753,7 @@ static const struct file_operations fops_ani = {
 	.write = write_file_ani,
 	.open = ath5k_debugfs_open,
 	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
@@ -811,6 +817,7 @@ static const struct file_operations fops_queue = {
 	.write = write_file_queue,
 	.open = ath5k_debugfs_open,
 	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 54aae931424e..cf500bf25ad5 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -71,7 +71,8 @@ static const struct file_operations fops_debug = {
 	.read = read_file_debug,
 	.write = write_file_debug,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 #endif
@@ -116,7 +117,8 @@ static const struct file_operations fops_tx_chainmask = {
 	.read = read_file_tx_chainmask,
 	.write = write_file_tx_chainmask,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
@@ -158,7 +160,8 @@ static const struct file_operations fops_rx_chainmask = {
 	.read = read_file_rx_chainmask,
 	.write = write_file_rx_chainmask,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
@@ -259,7 +262,8 @@ static ssize_t read_file_dma(struct file *file, char __user *user_buf,
 static const struct file_operations fops_dma = {
 	.read = read_file_dma,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 
@@ -375,7 +379,8 @@ static ssize_t read_file_interrupt(struct file *file, char __user *user_buf,
 static const struct file_operations fops_interrupt = {
 	.read = read_file_interrupt,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 void ath_debug_stat_rc(struct ath_softc *sc, int final_rate)
@@ -464,7 +469,8 @@ static ssize_t read_file_rcstat(struct file *file, char __user *user_buf,
 static const struct file_operations fops_rcstat = {
 	.read = read_file_rcstat,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 static const char * ath_wiphy_state_str(enum ath_wiphy_state state)
@@ -623,7 +629,8 @@ static const struct file_operations fops_wiphy = {
 	.read = read_file_wiphy,
 	.write = write_file_wiphy,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 #define PR(str, elem)							\
@@ -702,7 +709,8 @@ void ath_debug_stat_tx(struct ath_softc *sc, struct ath_txq *txq,
 static const struct file_operations fops_xmit = {
 	.read = read_file_xmit,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 static ssize_t read_file_recv(struct file *file, char __user *user_buf,
@@ -814,7 +822,8 @@ void ath_debug_stat_rx(struct ath_softc *sc, struct ath_rx_status *rs)
 static const struct file_operations fops_recv = {
 	.read = read_file_recv,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 static ssize_t read_file_regidx(struct file *file, char __user *user_buf,
@@ -852,7 +861,8 @@ static const struct file_operations fops_regidx = {
 	.read = read_file_regidx,
 	.write = write_file_regidx,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 static ssize_t read_file_regval(struct file *file, char __user *user_buf,
@@ -894,7 +904,8 @@ static const struct file_operations fops_regval = {
 	.read = read_file_regval,
 	.write = write_file_regval,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 int ath9k_init_debug(struct ath_hw *ah)
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_main.c b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
index 7d09b4b17bbd..bc2ca7d898e9 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_main.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_main.c
@@ -536,7 +536,8 @@ static ssize_t read_file_tgt_stats(struct file *file, char __user *user_buf,
 static const struct file_operations fops_tgt_stats = {
 	.read = read_file_tgt_stats,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
@@ -584,7 +585,8 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
 static const struct file_operations fops_xmit = {
 	.read = read_file_xmit,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 static ssize_t read_file_recv(struct file *file, char __user *user_buf,
@@ -613,7 +615,8 @@ static ssize_t read_file_recv(struct file *file, char __user *user_buf,
 static const struct file_operations fops_recv = {
 	.read = read_file_recv,
 	.open = ath9k_debugfs_open,
-	.owner = THIS_MODULE
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
 };
 
 int ath9k_htc_init_debug(struct ath_hw *ah)
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
index 8e84a08ff951..293e1dbc166c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
@@ -873,6 +873,7 @@ static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file,
 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
 	.read = iwl3945_sta_dbgfs_stats_table_read,
 	.open = iwl3945_open_file_generic,
+	.llseek = default_llseek,
 };
 
 static void iwl3945_add_debugfs(void *priv, void *priv_sta,
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index 23e5c42e7d7e..a4378ba31ef6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -2873,6 +2873,7 @@ static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
 	.write = rs_sta_dbgfs_scale_table_write,
 	.read = rs_sta_dbgfs_scale_table_read,
 	.open = open_file_generic,
+	.llseek = default_llseek,
 };
 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
 			char __user *user_buf, size_t count, loff_t *ppos)
@@ -2915,6 +2916,7 @@ static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
 	.read = rs_sta_dbgfs_stats_table_read,
 	.open = open_file_generic,
+	.llseek = default_llseek,
 };
 
 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
@@ -2946,6 +2948,7 @@ static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
 	.read = rs_sta_dbgfs_rate_scale_data_read,
 	.open = open_file_generic,
+	.llseek = default_llseek,
 };
 
 static void rs_add_debugfs(void *priv, void *priv_sta,
diff --git a/drivers/net/wireless/iwmc3200wifi/debugfs.c b/drivers/net/wireless/iwmc3200wifi/debugfs.c
index 53b0b7711f02..0a0cc9667cd6 100644
--- a/drivers/net/wireless/iwmc3200wifi/debugfs.c
+++ b/drivers/net/wireless/iwmc3200wifi/debugfs.c
@@ -402,24 +402,28 @@ static const struct file_operations iwm_debugfs_txq_fops = {
 	.owner =	THIS_MODULE,
 	.open =		iwm_generic_open,
 	.read =		iwm_debugfs_txq_read,
+	.llseek =	default_llseek,
 };
 
 static const struct file_operations iwm_debugfs_tx_credit_fops = {
 	.owner =	THIS_MODULE,
 	.open =		iwm_generic_open,
 	.read =		iwm_debugfs_tx_credit_read,
+	.llseek =	default_llseek,
 };
 
 static const struct file_operations iwm_debugfs_rx_ticket_fops = {
 	.owner =	THIS_MODULE,
 	.open =		iwm_generic_open,
 	.read =		iwm_debugfs_rx_ticket_read,
+	.llseek =	default_llseek,
 };
 
 static const struct file_operations iwm_debugfs_fw_err_fops = {
 	.owner =	THIS_MODULE,
 	.open =		iwm_generic_open,
 	.read =		iwm_debugfs_fw_err_read,
+	.llseek =	default_llseek,
 };
 
 void iwm_debugfs_init(struct iwm_priv *iwm)
diff --git a/drivers/net/wireless/iwmc3200wifi/sdio.c b/drivers/net/wireless/iwmc3200wifi/sdio.c
index edcb52330cf5..56383e7be835 100644
--- a/drivers/net/wireless/iwmc3200wifi/sdio.c
+++ b/drivers/net/wireless/iwmc3200wifi/sdio.c
@@ -364,6 +364,7 @@ static const struct file_operations iwm_debugfs_sdio_fops = {
 	.owner =	THIS_MODULE,
 	.open =		iwm_debugfs_sdio_open,
 	.read =		iwm_debugfs_sdio_read,
+	.llseek =	default_llseek,
 };
 
 static void if_sdio_debugfs_init(struct iwm_priv *iwm, struct dentry *parent_dir)
diff --git a/drivers/net/wireless/libertas/debugfs.c b/drivers/net/wireless/libertas/debugfs.c
index 74e94cc10e01..fbf3b0332bb7 100644
--- a/drivers/net/wireless/libertas/debugfs.c
+++ b/drivers/net/wireless/libertas/debugfs.c
@@ -962,6 +962,7 @@ static const struct file_operations lbs_debug_fops = {
 	.open = open_file_generic,
 	.write = lbs_debugfs_write,
 	.read = lbs_debugfs_read,
+	.llseek = default_llseek,
 };
 
 /**
diff --git a/drivers/net/wireless/ray_cs.c b/drivers/net/wireless/ray_cs.c
index 88560d0ae50a..dab30a8c7470 100644
--- a/drivers/net/wireless/ray_cs.c
+++ b/drivers/net/wireless/ray_cs.c
@@ -2802,6 +2802,7 @@ static ssize_t ray_cs_essid_proc_write(struct file *file,
 static const struct file_operations ray_cs_essid_proc_fops = {
 	.owner		= THIS_MODULE,
 	.write		= ray_cs_essid_proc_write,
+	.llseek		= noop_llseek,
 };
 
 static ssize_t int_proc_write(struct file *file, const char __user *buffer,
@@ -2835,6 +2836,7 @@ static ssize_t int_proc_write(struct file *file, const char __user *buffer,
 static const struct file_operations int_proc_fops = {
 	.owner		= THIS_MODULE,
 	.write		= int_proc_write,
+	.llseek		= noop_llseek,
 };
 #endif
 
diff --git a/drivers/net/wireless/rt2x00/rt2x00debug.c b/drivers/net/wireless/rt2x00/rt2x00debug.c
index 7d6f19a2805e..cea81e4c5c82 100644
--- a/drivers/net/wireless/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/rt2x00/rt2x00debug.c
@@ -315,6 +315,7 @@ static const struct file_operations rt2x00debug_fop_queue_dump = {
 	.poll		= rt2x00debug_poll_queue_dump,
 	.open		= rt2x00debug_open_queue_dump,
 	.release	= rt2x00debug_release_queue_dump,
+	.llseek		= default_llseek,
 };
 
 static ssize_t rt2x00debug_read_queue_stats(struct file *file,
@@ -371,6 +372,7 @@ static const struct file_operations rt2x00debug_fop_queue_stats = {
 	.read		= rt2x00debug_read_queue_stats,
 	.open		= rt2x00debug_file_open,
 	.release	= rt2x00debug_file_release,
+	.llseek		= default_llseek,
 };
 
 #ifdef CONFIG_RT2X00_LIB_CRYPTO
@@ -423,6 +425,7 @@ static const struct file_operations rt2x00debug_fop_crypto_stats = {
 	.read		= rt2x00debug_read_crypto_stats,
 	.open		= rt2x00debug_file_open,
 	.release	= rt2x00debug_file_release,
+	.llseek		= default_llseek,
 };
 #endif
 
@@ -543,6 +546,7 @@ static const struct file_operations rt2x00debug_fop_dev_flags = {
 	.read		= rt2x00debug_read_dev_flags,
 	.open		= rt2x00debug_file_open,
 	.release	= rt2x00debug_file_release,
+	.llseek		= default_llseek,
 };
 
 static struct dentry *rt2x00debug_create_file_driver(const char *name,
diff --git a/drivers/net/wireless/wl12xx/wl1251_debugfs.c b/drivers/net/wireless/wl12xx/wl1251_debugfs.c
index a4ae7c4d94b5..fa620a5e5303 100644
--- a/drivers/net/wireless/wl12xx/wl1251_debugfs.c
+++ b/drivers/net/wireless/wl12xx/wl1251_debugfs.c
@@ -238,6 +238,7 @@ static ssize_t tx_queue_len_read(struct file *file, char __user *userbuf,
 static const struct file_operations tx_queue_len_ops = {
 	.read = tx_queue_len_read,
 	.open = wl1251_open_file_generic,
+	.llseek = generic_file_llseek,
 };
 
 static ssize_t tx_queue_status_read(struct file *file, char __user *userbuf,
@@ -259,6 +260,7 @@ static ssize_t tx_queue_status_read(struct file *file, char __user *userbuf,
 static const struct file_operations tx_queue_status_ops = {
 	.read = tx_queue_status_read,
 	.open = wl1251_open_file_generic,
+	.llseek = generic_file_llseek,
 };
 
 static void wl1251_debugfs_delete_files(struct wl1251 *wl)
diff --git a/drivers/net/wireless/wl12xx/wl1271_debugfs.c b/drivers/net/wireless/wl12xx/wl1271_debugfs.c
index 6e25303a8e7f..66c2b90ddfd4 100644
--- a/drivers/net/wireless/wl12xx/wl1271_debugfs.c
+++ b/drivers/net/wireless/wl12xx/wl1271_debugfs.c
@@ -239,6 +239,7 @@ static ssize_t tx_queue_len_read(struct file *file, char __user *userbuf,
 static const struct file_operations tx_queue_len_ops = {
 	.read = tx_queue_len_read,
 	.open = wl1271_open_file_generic,
+	.llseek = default_llseek,
 };
 
 static ssize_t gpio_power_read(struct file *file, char __user *user_buf,
@@ -293,7 +294,8 @@ out:
 static const struct file_operations gpio_power_ops = {
 	.read = gpio_power_read,
 	.write = gpio_power_write,
-	.open = wl1271_open_file_generic
+	.open = wl1271_open_file_generic,
+	.llseek = default_llseek,
 };
 
 static void wl1271_debugfs_delete_files(struct wl1271 *wl)