arch/powerpc/sysdev/fsl_rio.c: release rapidio port I/O region resource if port faile...

The "struct rio_mport" contains a member of master port I/O memory
resource structure "struct resource iores".  This resource will be read
from device tree and be used for rapidio R/W transaction memory space.
Rapidio requests the port I/O memory resource under the root resource
"iomem_resource".

			struct rio_mport *port;
			port = kzalloc(sizeof(struct rio_mport), GFP_KERNEL);

			request_resource(&iomem_resource, &port->iores);

When port failed to initialize, allocated "rio_mport" structure memory
will be freed, and the port I/O memory resource structure pointer
"&port->iores" will be invalid.  If other requests resource under
"iomem_resource", "&port->iores" node may be operated in the child
resources list and this will cause the system to crash.

So the requested port I/O memory resource should be released before
freeing allocated "rio_mport" structure.

Signed-off-by: Liu Gang <Gang.Liu@freescale.com>
Acked-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 8d9b9c42260c92281dfd4d68689977a03588721f..de170fd5ba4eb8e2a4ff9d0d116f271aa7690a19 100644 (file)
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -1608,6 +1608,7 @@ int fsl_rio_setup(struct platform_device *dev)
        return 0;
 err:
        iounmap(priv->regs_win);
+       release_resource(&port->iores);
 err_res:
        kfree(priv);
 err_priv: