use mutex instead of semaphore in RocketPort driver
The RocketPort driver uses a semaphore as mutex. Use the mutex API instead of the (binary) semaphore. Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -81,6 +81,7 @@
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/mutex.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/wait.h>
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@ -89,7 +90,6 @@
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#include <asm/atomic.h>
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#include <linux/bitops.h>
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#include <linux/spinlock.h>
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#include <asm/semaphore.h>
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#include <linux/init.h>
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/****** RocketPort includes ******/
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@ -698,7 +698,7 @@ static void init_r_port(int board, int aiop, int chan, struct pci_dev *pci_dev)
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}
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}
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spin_lock_init(&info->slock);
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sema_init(&info->write_sem, 1);
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mutex_init(&info->write_mtx);
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rp_table[line] = info;
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if (pci_dev)
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tty_register_device(rocket_driver, line, &pci_dev->dev);
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@ -1657,8 +1657,11 @@ static void rp_put_char(struct tty_struct *tty, unsigned char ch)
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if (rocket_paranoia_check(info, "rp_put_char"))
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return;
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/* Grab the port write semaphore, locking out other processes that try to write to this port */
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down(&info->write_sem);
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/*
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* Grab the port write mutex, locking out other processes that try to
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* write to this port
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*/
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mutex_lock(&info->write_mtx);
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#ifdef ROCKET_DEBUG_WRITE
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printk(KERN_INFO "rp_put_char %c...", ch);
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@ -1680,12 +1683,12 @@ static void rp_put_char(struct tty_struct *tty, unsigned char ch)
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info->xmit_fifo_room--;
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}
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spin_unlock_irqrestore(&info->slock, flags);
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up(&info->write_sem);
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mutex_unlock(&info->write_mtx);
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}
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/*
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* Exception handler - write routine, called when user app writes to the device.
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* A per port write semaphore is used to protect from another process writing to
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* A per port write mutex is used to protect from another process writing to
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* this port at the same time. This other process could be running on the other CPU
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* or get control of the CPU if the copy_from_user() blocks due to a page fault (swapped out).
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* Spinlocks protect the info xmit members.
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@ -1702,7 +1705,7 @@ static int rp_write(struct tty_struct *tty,
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if (count <= 0 || rocket_paranoia_check(info, "rp_write"))
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return 0;
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down_interruptible(&info->write_sem);
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mutex_lock_interruptible(&info->write_mtx);
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#ifdef ROCKET_DEBUG_WRITE
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printk(KERN_INFO "rp_write %d chars...", count);
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@ -1773,7 +1776,7 @@ static int rp_write(struct tty_struct *tty,
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wake_up_interruptible(&tty->poll_wait);
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#endif
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}
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up(&info->write_sem);
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mutex_unlock(&info->write_mtx);
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return retval;
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}
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@ -15,6 +15,8 @@
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#define ROCKET_TYPE_MODEMIII 3
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#define ROCKET_TYPE_PC104 4
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#include <linux/mutex.h>
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#include <asm/io.h>
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#include <asm/byteorder.h>
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@ -1171,7 +1173,7 @@ struct r_port {
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struct wait_queue *close_wait;
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#endif
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spinlock_t slock;
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struct semaphore write_sem;
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struct mutex write_mtx;
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};
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#define RPORT_MAGIC 0x525001
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