[PATCH 4.9 22/87] s390/qdio: dont release memory in qdio_setup_irq()

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julian Wiedmann <j...@linux.ibm.com>

commit 2e68adcd2fb21b7188ba449f0fab3bee2910e500 upstream.

Calling qdio_release_memory() on error is just plain wrong. It frees
the main qdio_irq struct, when following code still uses it.

Also, no other error path in qdio_establish() does this. So trust
callers to clean up via qdio_free() if some step of the QDIO
initialization fails.

Fixes: 779e6e1c724d ("[S390] qdio: new qdio driver.")
Cc: <sta...@vger.kernel.org> #v2.6.27+
Signed-off-by: Julian Wiedmann <j...@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/s390/cio/qdio_setup.c |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

--- a/drivers/s390/cio/qdio_setup.c
+++ b/drivers/s390/cio/qdio_setup.c
@@ -456,7 +456,6 @@ int qdio_setup_irq(struct qdio_initializ
 {
        struct ciw *ciw;
        struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
-       int rc;
 
        memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
        memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
@@ -493,16 +492,14 @@ int qdio_setup_irq(struct qdio_initializ
        ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
        if (!ciw) {
                DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
-               rc = -EINVAL;
-               goto out_err;
+               return -EINVAL;
        }
        irq_ptr->equeue = *ciw;
 
        ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
        if (!ciw) {
                DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
-               rc = -EINVAL;
-               goto out_err;
+               return -EINVAL;
        }
        irq_ptr->aqueue = *ciw;
 
@@ -510,9 +507,6 @@ int qdio_setup_irq(struct qdio_initializ
        irq_ptr->orig_handler = init_data->cdev->handler;
        init_data->cdev->handler = qdio_int_handler;
        return 0;
-out_err:
-       qdio_release_memory(irq_ptr);
-       return rc;
 }
 
 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,