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usb: phy: replace spinlock with mutex in OTG FSM

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OTG Final State Machine calls functions which may sleep.

For example, start_gadget callback implementation can use
usb_gadget_vbus_connect(), whose context: can sleep.

If so, mutex should be used instead of spinlock.

Signed-off-by: Anton Tikhomirov <av.tikhomirov@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Anton Tikhomirov 2013-11-26 11:46:05 +09:00 committed by Felipe Balbi
parent d49dd78884
commit 16e569e966
3 changed files with 8 additions and 10 deletions
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7
drivers/usb/phy/phy-fsl-usb.c
View File

@ -848,7 +848,7 @@ static int fsl_otg_conf(struct platform_device *pdev)
pr_info("Couldn't init OTG timers\n");
goto err;
}
spin_lock_init(&fsl_otg_tc->fsm.lock);
mutex_init(&fsl_otg_tc->fsm.lock);
/* Set OTG state machine operations */
fsl_otg_tc->fsm.ops = &fsl_otg_ops;
@ -1017,10 +1017,9 @@ static int show_fsl_usb2_otg_state(struct device *dev,
struct otg_fsm *fsm = &fsl_otg_dev->fsm;
char *next = buf;
unsigned size = PAGE_SIZE;
unsigned long flags;
int t;
spin_lock_irqsave(&fsm->lock, flags);
mutex_lock(&fsm->lock);
/* basic driver infomation */
t = scnprintf(next, size,
@ -1088,7 +1087,7 @@ static int show_fsl_usb2_otg_state(struct device *dev,
size -= t;
next += t;
spin_unlock_irqrestore(&fsm->lock, flags);
mutex_unlock(&fsm->lock);
return PAGE_SIZE - size;
}

7
drivers/usb/phy/phy-fsm-usb.c
View File

@ -23,7 +23,7 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/usb.h>
#include <linux/usb/gadget.h>
@ -245,9 +245,8 @@ int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
int otg_statemachine(struct otg_fsm *fsm)
{
enum usb_otg_state state;
unsigned long flags;
spin_lock_irqsave(&fsm->lock, flags);
mutex_lock(&fsm->lock);
state = fsm->otg->phy->state;
state_changed = 0;
@ -359,7 +358,7 @@ int otg_statemachine(struct otg_fsm *fsm)
default:
break;
}
spin_unlock_irqrestore(&fsm->lock, flags);
mutex_lock(&fsm->lock);
VDBG("quit statemachine, changed = %d\n", state_changed);
return state_changed;

4
drivers/usb/phy/phy-fsm-usb.h
View File

@ -18,7 +18,7 @@
#ifndef __LINUX_USB_OTG_FSM_H
#define __LINUX_USB_OTG_FSM_H
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#undef VERBOSE
@ -116,7 +116,7 @@ struct otg_fsm {
/* Current usb protocol used: 0:undefine; 1:host; 2:client */
int protocol;
spinlock_t lock;
struct mutex lock;
};
struct otg_fsm_ops {