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Commit 00431707 authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Russell King
Browse files

[ARM] Convert some arm semaphores to mutexes 



The arm clock semaphores are strict mutexes, convert them to the new
mutex implementation

Signed-off-by: default avatarArjan van de Ven <arjan@infradead.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f4619025

arch/arm/common/rtctime.c

+8 −7
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/miscdevice.h>

#include <linux/spinlock.h>

#include <linux/device.h>

#include <linux/mutex.h>



#include <asm/rtc.h>

#include <asm/semaphore.h>
@@ -34,7 +35,7 @@ static unsigned long rtc_irq_data; 
/*

 * rtc_sem protects rtc_inuse and rtc_ops

 */

static DECLARE_MUTEX(rtc_sem);

static DEFINE_MUTEX(rtc_mutex);

static unsigned long rtc_inuse;

static struct rtc_ops *rtc_ops;
@@ -355,7 +356,7 @@ static int rtc_open(struct inode *inode, struct file *file) 
{

	int ret;



	down(&rtc_sem);

	mutex_lock(&rtc_mutex);



	if (rtc_inuse) {

		ret = -EBUSY;
@@ -373,7 +374,7 @@ static int rtc_open(struct inode *inode, struct file *file) 
			rtc_inuse = 1;

		}

	}

	up(&rtc_sem);

	mutex_unlock(&rtc_mutex);



	return ret;

}
@@ -479,7 +480,7 @@ int register_rtc(struct rtc_ops *ops) 
{

	int ret = -EBUSY;



	down(&rtc_sem);

	mutex_lock(&rtc_mutex);

	if (rtc_ops == NULL) {

		rtc_ops = ops;
@@ -488,7 +489,7 @@ int register_rtc(struct rtc_ops *ops) 
			create_proc_read_entry("driver/rtc", 0, NULL,

					       rtc_read_proc, ops);

	}

	up(&rtc_sem);

	mutex_unlock(&rtc_mutex);



	return ret;

}
@@ -496,12 +497,12 @@ EXPORT_SYMBOL(register_rtc); 


void unregister_rtc(struct rtc_ops *rtc)

{

	down(&rtc_sem);

	mutex_lock(&rtc_mutex);

	if (rtc == rtc_ops) {

		remove_proc_entry("driver/rtc", NULL);

		misc_deregister(&rtc_miscdev);

		rtc_ops = NULL;

	}

	up(&rtc_sem);

	mutex_unlock(&rtc_mutex);

}

EXPORT_SYMBOL(unregister_rtc);

arch/arm/kernel/ecard.c

+4 −3
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ 
#include <linux/proc_fs.h>

#include <linux/device.h>

#include <linux/init.h>

#include <linux/mutex.h>



#include <asm/dma.h>

#include <asm/ecard.h>
@@ -206,7 +207,7 @@ static void ecard_task_readbytes(struct ecard_request *req) 


static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);

static struct ecard_request *ecard_req;

static DECLARE_MUTEX(ecard_sem);

static DEFINE_MUTEX(ecard_mutex);



/*

 * Set up the expansion card daemon's page tables.
@@ -299,7 +300,7 @@ static void ecard_call(struct ecard_request *req) 


	req->complete = &completion;



	down(&ecard_sem);

	mutex_lock(&ecard_mutex);

	ecard_req = req;

	wake_up(&ecard_wait);
@@ -307,7 +308,7 @@ static void ecard_call(struct ecard_request *req) 
	 * Now wait for kecardd to run.

	 */

	wait_for_completion(&completion);

	up(&ecard_sem);

	mutex_unlock(&ecard_mutex);

}



/* ======================= Mid-level card control ===================== */

arch/arm/mach-aaec2000/clock.c

+8 −7
Original line number Diff line number Diff line
@@ -16,26 +16,27 @@ 
#include <linux/err.h>

#include <linux/string.h>

#include <linux/clk.h>

#include <linux/mutex.h>



#include <asm/semaphore.h>



#include "clock.h"



static LIST_HEAD(clocks);

static DECLARE_MUTEX(clocks_sem);

static DEFINE_MUTEX(clocks_mutex);



struct clk *clk_get(struct device *dev, const char *id)

{

	struct clk *p, *clk = ERR_PTR(-ENOENT);



	down(&clocks_sem);

	mutex_lock(&clocks_mutex);

	list_for_each_entry(p, &clocks, node) {

		if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {

			clk = p;

			break;

		}

	}

	up(&clocks_sem);

	mutex_unlock(&clocks_mutex);



	return clk;

}
@@ -78,18 +79,18 @@ EXPORT_SYMBOL(clk_set_rate); 


int clk_register(struct clk *clk)

{

	down(&clocks_sem);

	mutex_lock(&clocks_mutex);

	list_add(&clk->node, &clocks);

	up(&clocks_sem);

	mutex_unlock(&clocks_mutex);

	return 0;

}

EXPORT_SYMBOL(clk_register);



void clk_unregister(struct clk *clk)

{

	down(&clocks_sem);

	mutex_lock(&clocks_mutex);

	list_del(&clk->node);

	up(&clocks_sem);

	mutex_unlock(&clocks_mutex);

}

EXPORT_SYMBOL(clk_unregister);

arch/arm/mach-integrator/clock.c

+8 −7
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/err.h>

#include <linux/string.h>

#include <linux/clk.h>

#include <linux/mutex.h>



#include <asm/semaphore.h>

#include <asm/hardware/icst525.h>
@@ -22,20 +23,20 @@ 
#include "clock.h"



static LIST_HEAD(clocks);

static DECLARE_MUTEX(clocks_sem);

static DEFINE_MUTEX(clocks_mutex);



struct clk *clk_get(struct device *dev, const char *id)

{

	struct clk *p, *clk = ERR_PTR(-ENOENT);



	down(&clocks_sem);

	mutex_lock(&clocks_mutex);

	list_for_each_entry(p, &clocks, node) {

		if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {

			clk = p;

			break;

		}

	}

	up(&clocks_sem);

	mutex_unlock(&clocks_mutex);



	return clk;

}
@@ -107,18 +108,18 @@ static struct clk uart_clk = { 


int clk_register(struct clk *clk)

{

	down(&clocks_sem);

	mutex_lock(&clocks_mutex);

	list_add(&clk->node, &clocks);

	up(&clocks_sem);

	mutex_unlock(&clocks_mutex);

	return 0;

}

EXPORT_SYMBOL(clk_register);



void clk_unregister(struct clk *clk)

{

	down(&clocks_sem);

	mutex_lock(&clocks_mutex);

	list_del(&clk->node);

	up(&clocks_sem);

	mutex_unlock(&clocks_mutex);

}

EXPORT_SYMBOL(clk_unregister);

arch/arm/mach-pxa/ssp.c

+9 −8
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/interrupt.h>

#include <linux/ioport.h>

#include <linux/init.h>

#include <linux/mutex.h>

#include <asm/io.h>

#include <asm/irq.h>

#include <asm/hardware.h>
@@ -59,7 +60,7 @@ static const struct ssp_info_ ssp_info[PXA_SSP_PORTS] = { 
#endif

};



static DECLARE_MUTEX(sem);

static DEFINE_MUTEX(mutex);

static int use_count[PXA_SSP_PORTS] = {0, 0, 0};



static irqreturn_t ssp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
@@ -239,16 +240,16 @@ int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags) 
	if (port > PXA_SSP_PORTS || port == 0)

		return -ENODEV;



	down(&sem);

	mutex_lock(&mutex);

	if (use_count[port - 1]) {

		up(&sem);

		mutex_unlock(&mutex);

		return -EBUSY;

	}

	use_count[port - 1]++;



	if (!request_mem_region(__PREG(SSCR0_P(port)), 0x2c, "SSP")) {

		use_count[port - 1]--;

		up(&sem);

		mutex_unlock(&mutex);

		return -EBUSY;

	}

	dev->port = port;
@@ -265,13 +266,13 @@ int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags) 


	/* turn on SSP port clock */

	pxa_set_cken(ssp_info[port-1].clock, 1);

	up(&sem);

	mutex_unlock(&mutex);

	return 0;



out_region:

	release_mem_region(__PREG(SSCR0_P(port)), 0x2c);

	use_count[port - 1]--;

	up(&sem);

	mutex_unlock(&mutex);

	return ret;

}
@@ -282,7 +283,7 @@ out_region: 
 */

void ssp_exit(struct ssp_dev *dev)

{

	down(&sem);

	mutex_lock(&mutex);

	SSCR0_P(dev->port) &= ~SSCR0_SSE;



    	if (dev->port > PXA_SSP_PORTS || dev->port == 0) {
@@ -295,7 +296,7 @@ void ssp_exit(struct ssp_dev *dev) 
		free_irq(dev->irq, dev);

	release_mem_region(__PREG(SSCR0_P(dev->port)), 0x2c);

	use_count[dev->port - 1]--;

	up(&sem);

	mutex_unlock(&mutex);

}



EXPORT_SYMBOL(ssp_write_word);