hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[S390] tape: add medium state notifications 

Add uevent notifications for tape cartridge load and tape
cartridge unload events.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2010-11-10 10:05:52 +01:00 committed by Martin Schwidefsky
parent 25591b0703
commit 3b210e7652
1 changed files with 59 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
drivers/s390/char/tape_core.c
View File

@ -209,29 +209,79 @@ tape_state_set(struct tape_device *device, enum tape_state newstate)
wake_up(&device->state_change_wq);
}
struct tape_med_state_work_data {
struct tape_device *device;
enum tape_medium_state state;
struct work_struct work;
};
static void
tape_med_state_work_handler(struct work_struct *work)
{
static char env_state_loaded[] = "MEDIUM_STATE=LOADED";
static char env_state_unloaded[] = "MEDIUM_STATE=UNLOADED";
struct tape_med_state_work_data *p =
container_of(work, struct tape_med_state_work_data, work);
struct tape_device *device = p->device;
char *envp[] = { NULL, NULL };
switch (p->state) {
case MS_UNLOADED:
pr_info("%s: The tape cartridge has been successfully "
"unloaded\n", dev_name(&device->cdev->dev));
envp[0] = env_state_unloaded;
kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp);
break;
case MS_LOADED:
pr_info("%s: A tape cartridge has been mounted\n",
dev_name(&device->cdev->dev));
envp[0] = env_state_loaded;
kobject_uevent_env(&device->cdev->dev.kobj, KOBJ_CHANGE, envp);
break;
default:
break;
}
tape_put_device(device);
kfree(p);
}
static void
tape_med_state_work(struct tape_device *device, enum tape_medium_state state)
{
struct tape_med_state_work_data *p;
p = kzalloc(sizeof(*p), GFP_ATOMIC);
if (p) {
INIT_WORK(&p->work, tape_med_state_work_handler);
p->device = tape_get_device(device);
p->state = state;
schedule_work(&p->work);
}
}
void
tape_med_state_set(struct tape_device *device, enum tape_medium_state newstate)
{
if (device->medium_state == newstate)
enum tape_medium_state oldstate;
oldstate = device->medium_state;
if (oldstate == newstate)
return;
device->medium_state = newstate;
switch(newstate){
case MS_UNLOADED:
device->tape_generic_status |= GMT_DR_OPEN(~0);
if (device->medium_state == MS_LOADED)
pr_info("%s: The tape cartridge has been successfully "
"unloaded\n", dev_name(&device->cdev->dev));
if (oldstate == MS_LOADED)
tape_med_state_work(device, MS_UNLOADED);
break;
case MS_LOADED:
device->tape_generic_status &= ~GMT_DR_OPEN(~0);
if (device->medium_state == MS_UNLOADED)
pr_info("%s: A tape cartridge has been mounted\n",
dev_name(&device->cdev->dev));
if (oldstate == MS_UNLOADED)
tape_med_state_work(device, MS_LOADED);
break;
default:
// print nothing
break;
}
device->medium_state = newstate;
wake_up(&device->state_change_wq);
}