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From: Greg Kroah-Hartman on 10 Aug 2010 18:10
From: Alan Cox <alan(a)linux.intel.com>

Use the port mutext for config setting, the rest is locked sufficiently
anyway that the BKL makes no odds.

Signed-off-by: Alan Cox <alan(a)linux.intel.com>
Cc: Arnd Bergmann <arnd(a)arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>
---
drivers/char/cyclades.c | 20 +++++++++-----------
1 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/char/cyclades.c b/drivers/char/cyclades.c
index 9824b41..51acfe3 100644
--- a/drivers/char/cyclades.c
+++ b/drivers/char/cyclades.c
@@ -65,7 +65,6 @@
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
-#include <linux/smp_lock.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
@@ -1655,7 +1654,6 @@ static void cy_wait_until_sent(struct tty_struct *tty, int timeout)
return; /* Just in case.... */

orig_jiffies = jiffies;
- lock_kernel();
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
@@ -1702,7 +1700,6 @@ static void cy_wait_until_sent(struct tty_struct *tty, int timeout)
}
/* Run one more char cycle */
msleep_interruptible(jiffies_to_msecs(char_time * 5));
- unlock_kernel();
#ifdef CY_DEBUG_WAIT_UNTIL_SENT
printk(KERN_DEBUG "Clean (jiff=%lu)...done\n", jiffies);
#endif
@@ -1959,7 +1956,6 @@ static int cy_chars_in_buffer(struct tty_struct *tty)
int char_count;
__u32 tx_put, tx_get, tx_bufsize;

- lock_kernel();
tx_get = readl(&buf_ctrl->tx_get);
tx_put = readl(&buf_ctrl->tx_put);
tx_bufsize = readl(&buf_ctrl->tx_bufsize);
@@ -1971,7 +1967,6 @@ static int cy_chars_in_buffer(struct tty_struct *tty)
printk(KERN_DEBUG "cyc:cy_chars_in_buffer ttyC%d %d\n",
info->line, info->xmit_cnt + char_count);
#endif
- unlock_kernel();
return info->xmit_cnt + char_count;
}
#endif /* Z_EXT_CHARS_IN_BUFFER */
@@ -2359,17 +2354,22 @@ cy_set_serial_info(struct cyclades_port *info, struct tty_struct *tty,
struct serial_struct __user *new_info)
{
struct serial_struct new_serial;
+ int ret;

if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
return -EFAULT;

+ mutex_lock(&info->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
if (new_serial.close_delay != info->port.close_delay ||
new_serial.baud_base != info->baud ||
(new_serial.flags & ASYNC_FLAGS &
~ASYNC_USR_MASK) !=
(info->port.flags & ASYNC_FLAGS & ~ASYNC_USR_MASK))
+ {
+ mutex_unlock(&info->port.mutex);
return -EPERM;
+ }
info->port.flags = (info->port.flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK);
info->baud = new_serial.baud_base;
@@ -2392,10 +2392,12 @@ cy_set_serial_info(struct cyclades_port *info, struct tty_struct *tty,
check_and_exit:
if (info->port.flags & ASYNC_INITIALIZED) {
cy_set_line_char(info, tty);
- return 0;
+ ret = 0;
} else {
- return cy_startup(info, tty);
+ ret = cy_startup(info, tty);
}
+ mutex_unlock(&info->port.mutex);
+ return ret;
} /* set_serial_info */

/*
@@ -2438,7 +2440,6 @@ static int cy_tiocmget(struct tty_struct *tty, struct file *file)

card = info->card;

- lock_kernel();
if (!cy_is_Z(card)) {
unsigned long flags;
int channel = info->line - card->first_line;
@@ -2478,7 +2479,6 @@ static int cy_tiocmget(struct tty_struct *tty, struct file *file)
((lstatus & C_RS_CTS) ? TIOCM_CTS : 0);
}
end:
- unlock_kernel();
return result;
} /* cy_tiomget */

@@ -2696,7 +2696,6 @@ cy_ioctl(struct tty_struct *tty, struct file *file,
printk(KERN_DEBUG "cyc:cy_ioctl ttyC%d, cmd = %x arg = %lx\n",
info->line, cmd, arg);
#endif
- lock_kernel();

switch (cmd) {
case CYGETMON:
@@ -2817,7 +2816,6 @@ cy_ioctl(struct tty_struct *tty, struct file *file,
default:
ret_val = -ENOIOCTLCMD;
}
- unlock_kernel();

#ifdef CY_DEBUG_OTHER
printk(KERN_DEBUG "cyc:cy_ioctl done\n");
--
1.7.2

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Prev: [PATCH 60/68] mxser: remove unnesesary NULL check
Next: [PATCH 54/68] serial: general fixes in the serial_rs485 structure