[PATCH v3 1/2] remoteproc: cleanup acquired resources when rproc_handle_resources() fails in rproc_attach()

[Xiaolei Wang]

When rproc->state = RPROC_DETACHED and rproc_attach() is used
to attach to the remote processor, if rproc_handle_resources()
returns a failure, the resources allocated by imx_rproc_prepare()
should be released, otherwise the following memory leak will occur.

Since almost the same thing is done in imx_rproc_prepare() and
rproc_resource_cleanup(), Function rproc_resource_cleanup() is able
to deal with empty lists so it is better to fix the "goto" statements
in rproc_attach(). replace the "unprepare_device" goto statement with
"clean_up_resources" and get rid of the "unprepare_device" label.

unreferenced object 0xffff0000861c5d00 (size 128):
comm "kworker/u12:3", pid 59, jiffies 4294893509 (age 149.220s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 02 88 00 00 00 00 00 00 10 00 00 00 00 00 ............
backtrace:
 [<00000000f949fe18>] slab_post_alloc_hook+0x98/0x37c
 [<00000000adbfb3e7>] __kmem_cache_alloc_node+0x138/0x2e0
 [<00000000521c0345>] kmalloc_trace+0x40/0x158
 [<000000004e330a49>] rproc_mem_entry_init+0x60/0xf8
 [<000000002815755e>] imx_rproc_prepare+0xe0/0x180
 [<0000000003f61b4e>] rproc_boot+0x2ec/0x528
 [<00000000e7e994ac>] rproc_add+0x124/0x17c
 [<0000000048594076>] imx_rproc_probe+0x4ec/0x5d4
 [<00000000efc298a1>] platform_probe+0x68/0xd8
 [<00000000110be6fe>] really_probe+0x110/0x27c
 [<00000000e245c0ae>] __driver_probe_device+0x78/0x12c
 [<00000000f61f6f5e>] driver_probe_device+0x3c/0x118
 [<00000000a7874938>] __device_attach_driver+0xb8/0xf8
 [<0000000065319e69>] bus_for_each_drv+0x84/0xe4
 [<00000000db3eb243>] __device_attach+0xfc/0x18c
 [<0000000072e4e1a4>] device_initial_probe+0x14/0x20

Fixes: 10a3d4079eae ("remoteproc: imx_rproc: move memory parsing to rproc_ops")
Suggested-by: Mathieu Poirier <mathieu.poir...@linaro.org>
Signed-off-by: Xiaolei Wang <xiaolei.w...@windriver.com>
---
 drivers/remoteproc/remoteproc_core.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c 
b/drivers/remoteproc/remoteproc_core.c
index b21eedefff87..fb7515ef155f 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1617,7 +1617,7 @@ static int rproc_attach(struct rproc *rproc)
        ret = rproc_set_rsc_table(rproc);
        if (ret) {
                dev_err(dev, "can't load resource table: %d\n", ret);
-               goto unprepare_device;
+               goto clean_up_resources;
        }
 
        /* reset max_notifyid */
@@ -1634,7 +1634,7 @@ static int rproc_attach(struct rproc *rproc)
        ret = rproc_handle_resources(rproc, rproc_loading_handlers);
        if (ret) {
                dev_err(dev, "Failed to process resources: %d\n", ret);
-               goto unprepare_device;
+               goto clean_up_resources;
        }
 
        /* Allocate carveout resources associated to rproc */
@@ -1653,7 +1653,6 @@ static int rproc_attach(struct rproc *rproc)
 
 clean_up_resources:
        rproc_resource_cleanup(rproc);
-unprepare_device:
        /* release HW resources if needed */
        rproc_unprepare_device(rproc);
 disable_iommu:
-- 
2.25.1