diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/kernel/rtlx.c | 122 |
1 files changed, 42 insertions, 80 deletions
diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c index d92c48e0d7a6..766db51ab69e 100644 --- a/arch/mips/kernel/rtlx.c +++ b/arch/mips/kernel/rtlx.c @@ -146,9 +146,9 @@ static void stopping(int vpe) int rtlx_open(int index, int can_sleep) { - int ret; - struct rtlx_channel *chan; volatile struct rtlx_info **p; + struct rtlx_channel *chan; + int ret = 0; if (index >= RTLX_CHANNELS) { printk(KERN_DEBUG "rtlx_open index out of range\n"); @@ -165,65 +165,37 @@ int rtlx_open(int index, int can_sleep) if (rtlx == NULL) { if( (p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) { if (can_sleep) { - DECLARE_WAITQUEUE(wait, current); - - /* go to sleep */ - add_wait_queue(&channel_wqs[index].lx_queue, &wait); + int ret = 0; - set_current_state(TASK_INTERRUPTIBLE); - while ((p = vpe_get_shared(RTLX_TARG_VPE)) == NULL) { - schedule(); - set_current_state(TASK_INTERRUPTIBLE); - } - - set_current_state(TASK_RUNNING); - remove_wait_queue(&channel_wqs[index].lx_queue, &wait); - - /* back running */ + __wait_event_interruptible(channel_wqs[index].lx_queue, + (p = vpe_get_shared(RTLX_TARG_VPE)), + ret); + if (ret) + goto out_fail; } else { printk( KERN_DEBUG "No SP program loaded, and device " "opened with O_NONBLOCK\n"); channel_wqs[index].in_open = 0; - return -ENOSYS; + ret = -ENOSYS; + goto out_fail; } } if (*p == NULL) { if (can_sleep) { - DECLARE_WAITQUEUE(wait, current); - - /* go to sleep */ - add_wait_queue(&channel_wqs[index].lx_queue, &wait); + int ret = 0; - set_current_state(TASK_INTERRUPTIBLE); - while (*p == NULL) { - schedule(); - - /* reset task state to interruptable otherwise - we'll whizz round here like a very fast loopy - thing. schedule() appears to return with state - set to TASK_RUNNING. - - If the loaded SP program, for whatever reason, - doesn't set up the shared structure *p will never - become true. So whoever connected to either /dev/rt? - or if it was kspd, will then take up rather a lot of - processor cycles. - */ - - set_current_state(TASK_INTERRUPTIBLE); - } - - set_current_state(TASK_RUNNING); - remove_wait_queue(&channel_wqs[index].lx_queue, &wait); - - /* back running */ - } - else { + __wait_event_interruptible(channel_wqs[index].lx_queue, + *p != NULL, + ret); + if (ret) + goto out_fail; + } else { printk(" *vpe_get_shared is NULL. " "Has an SP program been loaded?\n"); channel_wqs[index].in_open = 0; - return -ENOSYS; + ret = -ENOSYS; + goto out_fail; } } @@ -231,10 +203,11 @@ int rtlx_open(int index, int can_sleep) printk(KERN_WARNING "vpe_get_shared returned an invalid pointer " "maybe an error code %d\n", (int)*p); channel_wqs[index].in_open = 0; - return -ENOSYS; + ret = -ENOSYS; + goto out_fail; } - if ((ret = rtlx_init(*p)) < 0) { + if ((ret = rtlx_init(*p)) < 0) { channel_wqs[index].in_open = 0; return ret; } @@ -250,6 +223,11 @@ int rtlx_open(int index, int can_sleep) chan->lx_state = RTLX_STATE_OPENED; channel_wqs[index].in_open = 0; return 0; + +out_fail: + channel_wqs[index].in_open--; + + return ret; } int rtlx_release(int index) @@ -270,30 +248,17 @@ unsigned int rtlx_read_poll(int index, int can_sleep) /* data available to read? */ if (chan->lx_read == chan->lx_write) { if (can_sleep) { - DECLARE_WAITQUEUE(wait, current); + int ret = 0; - /* go to sleep */ - add_wait_queue(&channel_wqs[index].lx_queue, &wait); + __wait_event_interruptible(channel_wqs[index].lx_queue, + chan->lx_read != chan->lx_write || sp_stopping, + ret); + if (ret) + return ret; - set_current_state(TASK_INTERRUPTIBLE); - while (chan->lx_read == chan->lx_write) { - schedule(); - - set_current_state(TASK_INTERRUPTIBLE); - - if (sp_stopping) { - set_current_state(TASK_RUNNING); - remove_wait_queue(&channel_wqs[index].lx_queue, &wait); - return 0; - } - } - - set_current_state(TASK_RUNNING); - remove_wait_queue(&channel_wqs[index].lx_queue, &wait); - - /* back running */ - } - else + if (sp_stopping) + return 0; + } else return 0; } @@ -454,25 +419,22 @@ static ssize_t file_write(struct file *file, const char __user * buffer, { int minor; struct rtlx_channel *rt; - DECLARE_WAITQUEUE(wait, current); minor = iminor(file->f_path.dentry->d_inode); rt = &rtlx->channel[minor]; /* any space left... */ if (!rtlx_write_poll(minor)) { + int ret = 0; if (file->f_flags & O_NONBLOCK) return -EAGAIN; - add_wait_queue(&channel_wqs[minor].rt_queue, &wait); - set_current_state(TASK_INTERRUPTIBLE); - - while (!rtlx_write_poll(minor)) - schedule(); - - set_current_state(TASK_RUNNING); - remove_wait_queue(&channel_wqs[minor].rt_queue, &wait); + __wait_event_interruptible(channel_wqs[minor].rt_queue, + rtlx_write_poll(minor), + ret); + if (ret) + return ret; } return rtlx_write(minor, (void *)buffer, count, 1); |