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Date: Fri, 16 Aug 2013 13:13:44 +0900
From: Won Kang <wkang77@...il.com>
To: devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc: gregkh@...uxfoundation.org, dan.carpenter@...cle.com,
yongjun_wei@...ndmicro.com.cn, joe@...ches.com,
sachin.kamat@...aro.org, Won Kang <wonkang@...semi.com>
Subject: [PATCH 2/2] staging: gdm7240: a TTY rewrite according to the latest TTY APIs
Fixed mis-use of mutex for gdm_table. gdm_table is refered to only
inside tty_install and port destrcut, and usb callbacks use internal
reference which was saved during urb submission
Signed-off-by: Won Kang <wonkang@...semi.com>
---
drivers/staging/gdm724x/gdm_mux.c | 9 ++++----
drivers/staging/gdm724x/gdm_mux.h | 14 +++++++++---
drivers/staging/gdm724x/gdm_tty.c | 45 ++++++++++++++++---------------------
drivers/staging/gdm724x/gdm_tty.h | 33 ++++++++++++++++++---------
4 files changed, 56 insertions(+), 45 deletions(-)
diff --git a/drivers/staging/gdm724x/gdm_mux.c b/drivers/staging/gdm724x/gdm_mux.c
index b630bab..9e217ff 100644
--- a/drivers/staging/gdm724x/gdm_mux.c
+++ b/drivers/staging/gdm724x/gdm_mux.c
@@ -25,7 +25,6 @@
#include <linux/usb/cdc.h>
#include "gdm_mux.h"
-#include "gdm_tty.h"
struct workqueue_struct *mux_rx_wq;
@@ -196,7 +195,7 @@ static int up_to_host(struct mux_rx *r)
ret = r->callback(mux_header->data,
payload_size,
index,
- mux_dev->minor[index],
+ mux_dev->tty_dev,
RECV_PACKET_PROCESS_CONTINUE
);
if (ret == TO_HOST_BUFFER_REQUEST_FAIL) {
@@ -209,7 +208,7 @@ static int up_to_host(struct mux_rx *r)
ret = r->callback(NULL,
0,
index,
- mux_dev->minor[index],
+ mux_dev->tty_dev,
RECV_PACKET_PROCESS_COMPLETE
);
break;
@@ -283,7 +282,7 @@ static void gdm_mux_rcv_complete(struct urb *urb)
}
static int gdm_mux_recv(void *priv_dev,
- int (*cb)(void *data, int len, int tty_index, int minor, int complete)
+ int (*cb)(void *data, int len, int tty_index, struct tty_dev *tty_dev, int complete)
)
{
struct mux_dev *mux_dev = priv_dev;
@@ -562,7 +561,7 @@ static int gdm_mux_probe(struct usb_interface *intf, const struct usb_device_id
goto out;
}
for (i = 0; i < TTY_MAX_COUNT; i++)
- mux_dev->minor[i] = tty_dev->minor[i];
+ mux_dev->tty_dev = tty_dev;
out:
if (ret < 0) {
diff --git a/drivers/staging/gdm724x/gdm_mux.h b/drivers/staging/gdm724x/gdm_mux.h
index d5b0b54..0163b24 100644
--- a/drivers/staging/gdm724x/gdm_mux.h
+++ b/drivers/staging/gdm724x/gdm_mux.h
@@ -18,6 +18,8 @@
#include <linux/usb.h>
#include <linux/list.h>
+#include "gdm_tty.h"
+
#define PM_NORMAL 0
#define PM_SUSPEND 1
@@ -57,7 +59,10 @@ struct mux_rx {
void *mux_dev;
u32 offset;
u32 len;
- int (*callback)(void *data, int len, int tty_index, int minor,
+ int (*callback)(void *data,
+ int len,
+ int tty_index,
+ struct tty_dev *tty_dev,
int complete);
};
@@ -78,10 +83,13 @@ struct mux_dev {
struct delayed_work work_rx;
struct usb_interface *intf;
int usb_state;
- int (*rx_cb)(void *data, int len, int tty_index, int minor,
+ int (*rx_cb)(void *data,
+ int len,
+ int tty_index,
+ struct tty_dev *tty_dev,
int complete);
spinlock_t write_lock;
- u8 minor[2];
+ struct tty_dev *tty_dev;
};
#endif /* _GDM_MUX_H_ */
diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
index 5bcf882..c1530b7 100644
--- a/drivers/staging/gdm724x/gdm_tty.c
+++ b/drivers/staging/gdm724x/gdm_tty.c
@@ -89,19 +89,22 @@ static int gdm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
mutex_lock(&gdm_table_lock);
gdm = gdm_table[i][j];
- mutex_unlock(&gdm_table_lock);
- if (gdm == NULL)
+ if (gdm == NULL) {
+ mutex_unlock(&gdm_table_lock);
return -ENODEV;
+ }
tty_port_get(&gdm->port);
ret = tty_standard_install(driver, tty);
if (ret) {
tty_port_put(&gdm->port);
+ mutex_unlock(&gdm_table_lock);
return ret;
}
tty->driver_data = gdm;
+ mutex_unlock(&gdm_table_lock);
return 0;
}
@@ -130,14 +133,13 @@ static void gdm_tty_close(struct tty_struct *tty, struct file *filp)
tty_port_close(&gdm->port, tty, filp);
}
-static int gdm_tty_recv_complete(void *data, int len, int index, int minor, int complete)
+static int gdm_tty_recv_complete(void *data,
+ int len,
+ int index,
+ struct tty_dev *tty_dev,
+ int complete)
{
- struct gdm *gdm;
-
- mutex_lock(&gdm_table_lock);
- gdm = gdm_table[index][minor];
- mutex_unlock(&gdm_table_lock);
-
+ struct gdm *gdm = tty_dev->gdm[index];
if (!GDM_TTY_READY(gdm)) {
if (complete == RECV_PACKET_PROCESS_COMPLETE)
gdm_tty_recv(gdm, gdm_tty_recv_complete);
@@ -223,31 +225,29 @@ int register_lte_tty_device(struct tty_dev *tty_dev, struct device *device)
return -ENOMEM;
mutex_lock(&gdm_table_lock);
-
for (j = 0; j < GDM_TTY_MINOR; j++) {
if (!gdm_table[i][j])
break;
}
if (j == GDM_TTY_MINOR) {
- tty_dev->minor[i] = GDM_TTY_MINOR;
+ kfree(gdm);
mutex_unlock(&gdm_table_lock);
return -EINVAL;
}
gdm_table[i][j] = gdm;
-
mutex_unlock(&gdm_table_lock);
- tty_dev->minor[i] = j;
-
+ tty_dev->gdm[i] = gdm;
tty_port_init(&gdm->port);
+
gdm->port.ops = &gdm_port_ops;
gdm->index = i;
gdm->minor = j;
gdm->tty_dev = tty_dev;
- tty_port_register_device(&gdm->port, gdm_driver[i], j, device);
+ tty_port_register_device(&gdm->port, gdm_driver[i], gdm->minor, device);
}
for (i = 0; i < MAX_ISSUE_NUM; i++)
@@ -261,31 +261,24 @@ void unregister_lte_tty_device(struct tty_dev *tty_dev)
struct gdm *gdm;
struct tty_struct *tty;
int i;
- int j;
for (i = 0; i < TTY_MAX_COUNT; i++) {
-
- j = tty_dev->minor[i];
-
- if (j >= GDM_TTY_MINOR)
+ gdm = tty_dev->gdm[i];
+ if (!gdm)
continue;
mutex_lock(&gdm_table_lock);
- gdm = gdm_table[i][j];
+ gdm_table[gdm->index][gdm->minor] = NULL;
mutex_unlock(&gdm_table_lock);
- if (!gdm)
- continue;
-
tty = tty_port_tty_get(&gdm->port);
if (tty) {
tty_vhangup(tty);
tty_kref_put(tty);
}
- tty_unregister_device(gdm_driver[i], j);
+ tty_unregister_device(gdm_driver[i], gdm->minor);
tty_port_put(&gdm->port);
-
}
}
diff --git a/drivers/staging/gdm724x/gdm_tty.h b/drivers/staging/gdm724x/gdm_tty.h
index 64db5e6..297438b 100644
--- a/drivers/staging/gdm724x/gdm_tty.h
+++ b/drivers/staging/gdm724x/gdm_tty.h
@@ -33,17 +33,6 @@ enum RECV_PACKET_PROCESS {
RECV_PACKET_PROCESS_CONTINUE = 1,
};
-struct tty_dev {
- void *priv_dev;
- int (*send_func)(void *priv_dev, void *data, int len, int tty_index,
- void (*cb)(void *cb_data), void *cb_data);
- int (*recv_func)(void *priv_dev, int (*cb)(void *data, int len,
- int tty_index, int minor, int complete));
- int (*send_control)(void *priv_dev, int request, int value, void *data,
- int len);
- u8 minor[2];
-};
-
struct gdm {
struct tty_dev *tty_dev;
struct tty_port port;
@@ -51,6 +40,28 @@ struct gdm {
unsigned int minor;
};
+struct tty_dev {
+ void *priv_dev;
+ int (*send_func)(void *priv_dev,
+ void *data,
+ int len,
+ int tty_index,
+ void (*cb)(void *cb_data),
+ void *cb_data);
+ int (*recv_func)(void *priv_dev,
+ int (*cb)(void *data,
+ int len,
+ int tty_index,
+ struct tty_dev *tty_dev,
+ int complete));
+ int (*send_control)(void *priv_dev,
+ int request,
+ int value,
+ void *data,
+ int len);
+ struct gdm *gdm[2];
+};
+
int register_lte_tty_driver(void);
void unregister_lte_tty_driver(void);
int register_lte_tty_device(struct tty_dev *tty_dev, struct device *dev);
--
1.7.10.4
--
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