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get rid of home-grown mutex in cris eeprom.c 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-05-21 11:19:18 -04:00
parent 48c1e44ace
commit 4f0447b818
1 changed files with 8 additions and 19 deletions
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27
arch/cris/arch-v10/drivers/eeprom.c
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@ -73,8 +73,7 @@ struct eeprom_type
int adapt_state; /* 1 = To high , 0 = Even, -1 = To low */
/* this one is to keep the read/write operations atomic */
wait_queue_head_t wait_q;
volatile int busy;
struct mutex lock;
int retry_cnt_addr; /* Used to keep track of number of retries for
adaptive timing adjustments */
int retry_cnt_read;
@ -115,8 +114,7 @@ const struct file_operations eeprom_fops =
int __init eeprom_init(void)
{
init_waitqueue_head(&eeprom.wait_q);
eeprom.busy = 0;
mutex_init(&eeprom.lock);
#ifdef CONFIG_ETRAX_I2C_EEPROM_PROBE
#define EETEXT "Found"
@ -461,12 +459,9 @@ static ssize_t eeprom_read(struct file * file, char * buf, size_t count, loff_t
return -EFAULT;
}
wait_event_interruptible(eeprom.wait_q, !eeprom.busy);
if (signal_pending(current))
if (mutex_lock_interruptible(&eeprom.lock))
return -EINTR;
eeprom.busy++;
page = (unsigned char) (p >> 8);
if(!eeprom_address(p))
@ -476,8 +471,7 @@ static ssize_t eeprom_read(struct file * file, char * buf, size_t count, loff_t
i2c_stop();
/* don't forget to wake them up */
eeprom.busy--;
wake_up_interruptible(&eeprom.wait_q);
mutex_unlock(&eeprom.lock);
return -EFAULT;
}
@ -504,8 +498,7 @@ static ssize_t eeprom_read(struct file * file, char * buf, size_t count, loff_t
file->f_pos += read;
}
eeprom.busy--;
wake_up_interruptible(&eeprom.wait_q);
mutex_unlock(&eeprom.lock);
return read;
}
@ -534,11 +527,9 @@ static ssize_t eeprom_write(struct file * file, const char * buf, size_t count,
return -EFAULT;
}
wait_event_interruptible(eeprom.wait_q, !eeprom.busy);
/* bail out if we get interrupted */
if (signal_pending(current))
if (mutex_lock_interruptible(&eeprom.lock))
return -EINTR;
eeprom.busy++;
for(i = 0; (i < EEPROM_RETRIES) && (restart > 0); i++)
{
restart = 0;
@ -556,8 +547,7 @@ static ssize_t eeprom_write(struct file * file, const char * buf, size_t count,
i2c_stop();
/* don't forget to wake them up */
eeprom.busy--;
wake_up_interruptible(&eeprom.wait_q);
mutex_unlock(&eeprom.lock);
return -EFAULT;
}
#ifdef EEPROM_ADAPTIVE_TIMING
@ -669,8 +659,7 @@ static ssize_t eeprom_write(struct file * file, const char * buf, size_t count,
} /* while */
} /* for */
eeprom.busy--;
wake_up_interruptible(&eeprom.wait_q);
mutex_unlock(&eeprom.lock);
if (written == 0 && file->f_pos >= eeprom.size){
return -ENOSPC;
}