s390/3270: avoid endless I/O loop with disconnected 3270 terminals
If a 3270 terminal is disconnected while the tty view is active
the 3270 driver goes into an endless loop of failed I/O requests
until the terminal is connected again.
Add code to the raw3270 interrupt handler to check for unit checks
due to failed I/O requests and put the device to sleep with the
RAW3270_FLAGS_BUSY flag until a unsolicited device end interrupt
indicates that the device can be used again. while we are at it
simplify the 3270 irq handling and remove unnecessary code.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/raw3270.h b/drivers/s390/char/raw3270.h
index e1e41c2..56519cb 100644
--- a/drivers/s390/char/raw3270.h
+++ b/drivers/s390/char/raw3270.h
@@ -125,19 +125,13 @@
void raw3270_buffer_address(struct raw3270 *, char *, unsigned short);
-/* Return value of *intv (see raw3270_fn below) can be one of the following: */
-#define RAW3270_IO_DONE 0 /* request finished */
-#define RAW3270_IO_BUSY 1 /* request still active */
-#define RAW3270_IO_RETRY 2 /* retry current request */
-#define RAW3270_IO_STOP 3 /* kill current request */
-
/*
* Functions of a 3270 view.
*/
struct raw3270_fn {
int (*activate)(struct raw3270_view *);
void (*deactivate)(struct raw3270_view *);
- int (*intv)(struct raw3270_view *,
+ void (*intv)(struct raw3270_view *,
struct raw3270_request *, struct irb *);
void (*release)(struct raw3270_view *);
void (*free)(struct raw3270_view *);