[PATCH] ibmvfc: free channel_setup_buf during device tear down

The buffer for negotiating channel setup is DMA allocated at device
probe time. However, the remove path fails to free this allocation which
will prevent the hypervisor from releasing the virtual device in the
case of a hotplug remove.

Fix this issue by freeing the buffer allocation in ibmvfc_free_mem().

Fixes: e95eef3fc0bc ("scsi: ibmvfc: Implement channel enquiry and setup commands")
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
---
 drivers/scsi/ibmvscsi/ibmvfc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index e663085a8944..76531eec49de 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c

@@ -5770,6 +5770,8 @@ static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
 			  vhost->disc_buf_dma);
 	dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
 			  vhost->login_buf, vhost->login_buf_dma);
+	dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf),
+			  vhost->channel_setup_buf, vhost->channel_setup_dma);
 	dma_pool_destroy(vhost->sg_pool);
 	ibmvfc_free_queue(vhost, async_q);
 	LEAVE;

-- 
2.27.0

On Wed, 10 Mar 2021 19:22:12 -0600, Tyrel Datwyler wrote:

The buffer for negotiating channel setup is DMA allocated at device
probe time. However, the remove path fails to free this allocation which
will prevent the hypervisor from releasing the virtual device in the
case of a hotplug remove.

Fix this issue by freeing the buffer allocation in ibmvfc_free_mem().

Applied to 5.12/scsi-fixes, thanks!

[1/1] ibmvfc: free channel_setup_buf during device tear down
      https://git.kernel.org/mkp/scsi/c/febb0cc847e7

-- 
Martin K. Petersen	Oracle Linux Engineering