diff options
Diffstat (limited to 'drivers/s390/char/con3215.c')
| -rw-r--r-- | drivers/s390/char/con3215.c | 53 |
1 files changed, 29 insertions, 24 deletions
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c index d3ec9b55ab35..9ab06e0dad40 100644 --- a/drivers/s390/char/con3215.c +++ b/drivers/s390/char/con3215.c @@ -21,6 +21,7 @@ #include <linux/console.h> #include <linux/interrupt.h> #include <linux/err.h> +#include <linux/reboot.h> #include <linux/slab.h> #include <linux/bootmem.h> @@ -88,7 +89,6 @@ struct raw3215_info { int count; /* number of bytes in output buffer */ int written; /* number of bytes in write requests */ struct tty_struct *tty; /* pointer to tty structure if present */ - struct tasklet_struct tasklet; struct raw3215_req *queued_read; /* pointer to queued read requests */ struct raw3215_req *queued_write;/* pointer to queued write requests */ wait_queue_head_t empty_wait; /* wait queue for flushing */ @@ -341,21 +341,14 @@ raw3215_try_io(struct raw3215_info *raw) } /* - * The bottom half handler routine for 3215 devices. It tries to start - * the next IO and wakes up processes waiting on the tty. + * Try to start the next IO and wake up processes waiting on the tty. */ -static void -raw3215_tasklet(void *data) +static void raw3215_next_io(struct raw3215_info *raw) { - struct raw3215_info *raw; struct tty_struct *tty; - unsigned long flags; - raw = (struct raw3215_info *) data; - spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); raw3215_mk_write_req(raw); raw3215_try_io(raw); - spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); tty = raw->tty; if (tty != NULL && RAW3215_BUFFER_SIZE - raw->count >= RAW3215_MIN_SPACE) { @@ -380,7 +373,7 @@ raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) cstat = irb->scsw.cmd.cstat; dstat = irb->scsw.cmd.dstat; if (cstat != 0) - tasklet_schedule(&raw->tasklet); + raw3215_next_io(raw); if (dstat & 0x01) { /* we got a unit exception */ dstat &= ~0x01; /* we can ignore it */ } @@ -390,7 +383,7 @@ raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) break; /* Attention interrupt, someone hit the enter key */ raw3215_mk_read_req(raw); - tasklet_schedule(&raw->tasklet); + raw3215_next_io(raw); break; case 0x08: case 0x0C: @@ -448,7 +441,7 @@ raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) raw->queued_read == NULL) { wake_up_interruptible(&raw->empty_wait); } - tasklet_schedule(&raw->tasklet); + raw3215_next_io(raw); break; default: /* Strange interrupt, I'll do my best to clean up */ @@ -460,7 +453,7 @@ raw3215_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) raw->flags &= ~RAW3215_WORKING; raw3215_free_req(req); } - tasklet_schedule(&raw->tasklet); + raw3215_next_io(raw); } return; } @@ -674,9 +667,6 @@ raw3215_probe (struct ccw_device *cdev) kfree(raw); return -ENOMEM; } - tasklet_init(&raw->tasklet, - (void (*)(unsigned long)) raw3215_tasklet, - (unsigned long) raw); init_waitqueue_head(&raw->empty_wait); cdev->dev.driver_data = raw; @@ -775,11 +765,11 @@ static struct tty_driver *con3215_device(struct console *c, int *index) } /* - * panic() calls console_unblank before the system enters a - * disabled, endless loop. + * panic() calls con3215_flush through a panic_notifier + * before the system enters a disabled, endless loop. */ static void -con3215_unblank(void) +con3215_flush(void) { struct raw3215_info *raw; unsigned long flags; @@ -790,6 +780,23 @@ con3215_unblank(void) spin_unlock_irqrestore(get_ccwdev_lock(raw->cdev), flags); } +static int con3215_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + con3215_flush(); + return NOTIFY_OK; +} + +static struct notifier_block on_panic_nb = { + .notifier_call = con3215_notify, + .priority = 0, +}; + +static struct notifier_block on_reboot_nb = { + .notifier_call = con3215_notify, + .priority = 0, +}; + /* * The console structure for the 3215 console */ @@ -797,7 +804,6 @@ static struct console con3215 = { .name = "ttyS", .write = con3215_write, .device = con3215_device, - .unblank = con3215_unblank, .flags = CON_PRINTBUFFER, }; @@ -846,9 +852,6 @@ con3215_init(void) cdev->handler = raw3215_irq; raw->flags |= RAW3215_FIXED; - tasklet_init(&raw->tasklet, - (void (*)(unsigned long)) raw3215_tasklet, - (unsigned long) raw); init_waitqueue_head(&raw->empty_wait); /* Request the console irq */ @@ -859,6 +862,8 @@ con3215_init(void) raw3215[0] = NULL; return -ENODEV; } + atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); + register_reboot_notifier(&on_reboot_nb); register_console(&con3215); return 0; } |