[PATCH libbsd] mmcsd: Fix missing MMCBUS_RELEASE_BUS.

[Christian Mauderer]

The rtems_bsd_mmcsd_attach_worker acquired the bus without releasing it.
Fix that by only acquire the bus if necessary (during initialization and
during read / writes).
---
 freebsd/sys/dev/mmc/mmcsd.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/freebsd/sys/dev/mmc/mmcsd.c b/freebsd/sys/dev/mmc/mmcsd.c
index 077f8d74..674be6a7 100644
--- a/freebsd/sys/dev/mmc/mmcsd.c
+++ b/freebsd/sys/dev/mmc/mmcsd.c
@@ -268,6 +268,8 @@ rtems_bsd_mmcsd_set_block_size(device_t dev, uint32_t block_size)
 	memset(&req, 0, sizeof(req));
 	memset(&cmd, 0, sizeof(cmd));
 
+	MMCBUS_ACQUIRE_BUS(device_get_parent(dev), dev);
+
 	req.cmd = &cmd;
 	cmd.opcode = MMC_SET_BLOCKLEN;
 	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
@@ -278,6 +280,8 @@ rtems_bsd_mmcsd_set_block_size(device_t dev, uint32_t block_size)
 		status_code = RTEMS_IO_ERROR;
 	}
 
+	MMCBUS_RELEASE_BUS(device_get_parent(dev), dev);
+
 	return status_code;
 }
 
@@ -316,6 +320,7 @@ rtems_bsd_mmcsd_disk_read_write(struct mmcsd_part *part, rtems_blkdev_request *b
 		data_flags = MMC_DATA_READ;
 	}
 
+	MMCBUS_ACQUIRE_BUS(device_get_parent(dev), dev);
 	MMCSD_DISK_LOCK(part);
 
 	for (i = 0; i < buffer_count; ++i) {
@@ -394,6 +399,7 @@ rtems_bsd_mmcsd_disk_read_write(struct mmcsd_part *part, rtems_blkdev_request *b
 error:
 
 	MMCSD_DISK_UNLOCK(part);
+	MMCBUS_RELEASE_BUS(device_get_parent(dev), dev);
 
 	rtems_blkdev_request_done(blkreq, status_code);
 
@@ -436,8 +442,6 @@ rtems_bsd_mmcsd_attach_worker(rtems_media_state state, const char *src, char **d
 			goto error;
 		}
 
-		MMCBUS_ACQUIRE_BUS(device_get_parent(dev), dev);
-
 		status_code = rtems_bsd_mmcsd_set_block_size(dev, block_size);
 		if (status_code != RTEMS_SUCCESSFUL) {
 			printf("OOPS: set block size failed\n");
-- 
2.16.4