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s390/dasd: simplify locking in process_final_queue

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Simplify locking in __dasd_device_process_final_queue to fix
the following sparse warning:

drivers/s390/block/dasd.c:1902:9: warning:
context imbalance in '__dasd_device_process_final_queue' - different lock contexts for basic block

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2018-05-24 12:18:58 +02:00 committed by Martin Schwidefsky
parent 7352c54693
commit 5c618c0cf4
1 changed files with 32 additions and 27 deletions
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59
drivers/s390/block/dasd.c
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@ -1885,6 +1885,33 @@ static void __dasd_device_process_ccw_queue(struct dasd_device *device,
}
}
static void __dasd_process_cqr(struct dasd_device *device,
struct dasd_ccw_req *cqr)
{
char errorstring[ERRORLENGTH];
switch (cqr->status) {
case DASD_CQR_SUCCESS:
cqr->status = DASD_CQR_DONE;
break;
case DASD_CQR_ERROR:
cqr->status = DASD_CQR_NEED_ERP;
break;
case DASD_CQR_CLEARED:
cqr->status = DASD_CQR_TERMINATED;
break;
default:
/* internal error 12 - wrong cqr status*/
snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
dev_err(&device->cdev->dev,
"An error occurred in the DASD device driver, "
"reason=%s\n", errorstring);
BUG();
}
if (cqr->callback)
cqr->callback(cqr, cqr->callback_data);
}
/*
* the cqrs from the final queue are returned to the upper layer
* by setting a dasd_block state and calling the callback function
@ -1895,40 +1922,18 @@ static void __dasd_device_process_final_queue(struct dasd_device *device,
struct list_head *l, *n;
struct dasd_ccw_req *cqr;
struct dasd_block *block;
void (*callback)(struct dasd_ccw_req *, void *data);
void *callback_data;
char errorstring[ERRORLENGTH];
list_for_each_safe(l, n, final_queue) {
cqr = list_entry(l, struct dasd_ccw_req, devlist);
list_del_init(&cqr->devlist);
block = cqr->block;
callback = cqr->callback;
callback_data = cqr->callback_data;
if (block)
if (!block) {
__dasd_process_cqr(device, cqr);
} else {
spin_lock_bh(&block->queue_lock);
switch (cqr->status) {
case DASD_CQR_SUCCESS:
cqr->status = DASD_CQR_DONE;
break;
case DASD_CQR_ERROR:
cqr->status = DASD_CQR_NEED_ERP;
break;
case DASD_CQR_CLEARED:
cqr->status = DASD_CQR_TERMINATED;
break;
default:
/* internal error 12 - wrong cqr status*/
snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
dev_err(&device->cdev->dev,
"An error occurred in the DASD device driver, "
"reason=%s\n", errorstring);
BUG();
}
if (cqr->callback != NULL)
(callback)(cqr, callback_data);
if (block)
__dasd_process_cqr(device, cqr);
spin_unlock_bh(&block->queue_lock);
}
}
}