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Message-ID: <20070422213531.GO5013@traven>
Date: Sun, 22 Apr 2007 23:35:31 +0200
From: Matthias Kaehlcke <matthias.kaehlcke@...il.com>
To: emoenke@...g.de, minyard@...rch.cirr.com
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] use spinlock instead of binary mutex in CDU-31A driver
use spinlock instead of binary mutex in CDU-31A driver
Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@...il.com>
--
diff --git a/drivers/cdrom/cdu31a.c b/drivers/cdrom/cdu31a.c
index 2157c58..d3649e4 100644
--- a/drivers/cdrom/cdu31a.c
+++ b/drivers/cdrom/cdu31a.c
@@ -263,7 +263,7 @@ static int sony_toc_read = 0; /* Has the TOC been read for
static struct s_sony_subcode last_sony_subcode; /* Points to the last
subcode address read */
-static DECLARE_MUTEX(sony_sem); /* Semaphore for drive hardware access */
+static DEFINE_MUTEX(sony_mtx); /* Mutex for drive hardware access */
static int is_double_speed = 0; /* does the drive support double speed ? */
@@ -339,11 +339,11 @@ static int scd_drive_status(struct cdrom_device_info *cdi, int slot_nr)
return -EINVAL;
if (sony_spun_up)
return CDS_DISC_OK;
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
if (scd_spinup() == 0)
sony_spun_up = 1;
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
return sony_spun_up ? CDS_DISC_OK : CDS_DRIVE_NOT_READY;
}
@@ -452,7 +452,7 @@ static int scd_reset(struct cdrom_device_info *cdi)
{
unsigned long retry_count;
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
reset_drive();
@@ -461,7 +461,7 @@ static int scd_reset(struct cdrom_device_info *cdi)
sony_sleep();
}
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
return 0;
}
@@ -655,10 +655,10 @@ static int scd_select_speed(struct cdrom_device_info *cdi, int speed)
else
sony_speed = speed - 1;
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
set_drive_params(sony_speed);
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
return 0;
}
@@ -673,10 +673,10 @@ static int scd_lock_door(struct cdrom_device_info *cdi, int lock)
} else {
is_auto_eject = 0;
}
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
set_drive_params(sony_speed);
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
return 0;
}
@@ -1143,7 +1143,7 @@ static void handle_abort_timeout(unsigned long data)
{
pr_debug(PFX "Entering %s\n", __FUNCTION__);
/* If it is in use, ignore it. */
- if (down_trylock(&sony_sem) == 0) {
+ if (mutex_trylock(&sony_mtx) == 0) {
/* We can't use abort_read(), because it will sleep
or schedule in the timer interrupt. Just start
the operation, finish it on the next access to
@@ -1154,7 +1154,7 @@ static void handle_abort_timeout(unsigned long data)
sony_blocks_left = 0;
abort_read_started = 1;
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
}
pr_debug(PFX "Leaving %s\n", __FUNCTION__);
}
@@ -1300,7 +1300,7 @@ static void do_cdu31a_request(request_queue_t * q)
pr_debug(PFX "Entering %s\n", __FUNCTION__);
spin_unlock_irq(q->queue_lock);
- if (down_interruptible(&sony_sem)) {
+ if (mutex_lock_interruptible(&sony_mtx)) {
spin_lock_irq(q->queue_lock);
return;
}
@@ -1435,7 +1435,7 @@ static void do_cdu31a_request(request_queue_t * q)
add_timer(&cdu31a_abort_timer);
#endif
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
spin_lock_irq(q->queue_lock);
pr_debug(PFX "Leaving %s at %d\n", __FUNCTION__, __LINE__);
}
@@ -1906,10 +1906,10 @@ static int scd_get_last_session(struct cdrom_device_info *cdi,
return 1;
if (!sony_toc_read) {
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
sony_get_toc();
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
}
ms_info->addr_format = CDROM_LBA;
@@ -1988,11 +1988,11 @@ scd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
unsigned int res_size;
memset(mcn->medium_catalog_number, 0, 14);
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
do_sony_cd_cmd(SONY_REQ_UPC_EAN_CMD,
NULL, 0, resbuffer, &res_size);
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
if ((res_size < 2) || ((resbuffer[0] & 0xf0) == 0x20));
else {
/* packed bcd to single ASCII digits */
@@ -2207,7 +2207,7 @@ static int read_audio(struct cdrom_read_audio *ra)
unsigned int res_size;
unsigned int cframe;
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
if (!sony_spun_up)
scd_spinup();
@@ -2343,7 +2343,7 @@ static int read_audio(struct cdrom_read_audio *ra)
}
out_up:
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
return retval;
}
@@ -2373,7 +2373,7 @@ static int scd_tray_move(struct cdrom_device_info *cdi, int position)
{
int retval;
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
if (position == 1 /* open tray */ ) {
unsigned char res_reg[12];
@@ -2392,7 +2392,7 @@ static int scd_tray_move(struct cdrom_device_info *cdi, int position)
sony_spun_up = 1;
retval = 0;
}
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
return retval;
}
@@ -2407,7 +2407,7 @@ static int scd_audio_ioctl(struct cdrom_device_info *cdi,
unsigned char params[7];
int i, retval;
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
switch (cmd) {
case CDROMSTART: /* Spin up the drive */
@@ -2665,7 +2665,7 @@ static int scd_audio_ioctl(struct cdrom_device_info *cdi,
retval = -EINVAL;
break;
}
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
return retval;
}
@@ -2675,7 +2675,7 @@ static int scd_read_audio(struct cdrom_device_info *cdi,
void __user *argp = (void __user *)arg;
int retval;
- if (down_interruptible(&sony_sem))
+ if (mutex_lock_interruptible(&sony_mtx))
return -ERESTARTSYS;
switch (cmd) {
case CDROMREADAUDIO: /* Read 2352 byte audio tracks and 2340 byte
@@ -2749,7 +2749,7 @@ static int scd_read_audio(struct cdrom_device_info *cdi,
default:
retval = -EINVAL;
}
- up(&sony_sem);
+ mutex_unlock(&sony_mtx);
return retval;
}
--
Matthias Kaehlcke
Linux Application Developer
Barcelona
If you don't know where you are going,
you will probably end up somewhere else
(Laurence J. Peter)
.''`.
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