From: Yang Yingliang yangyingliang@huawei.com
[ Upstream commit 55879dad0f3ae8468444b42f785ad79eac05fe5b ]
The device names allocated by dev_set_name() need be freed before module unloading, but they can not be freed because the kobject's refcount which was set in device_initialize() has not be decreased to 0.
As comment of device_add() says, if it fails, use only put_device() drop the refcount, then the name will be freed in kobejct_cleanup().
device_del() and put_device() can be replaced with device_unregister(), so call it to unregister the added successfully devices, and just call put_device() to the not added device.
Add a release() function to device to avoid null release() function WARNING in device_release(), it's empty, because the context devices are freed together in host1x_memory_context_list_free().
Fixes: 8aa5bcb61612 ("gpu: host1x: Add context device management code") Signed-off-by: Yang Yingliang yangyingliang@huawei.com Reviewed-by: Mikko Perttunen mperttunen@nvidia.com Signed-off-by: Thierry Reding treding@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/host1x/context.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/host1x/context.c b/drivers/gpu/host1x/context.c index 291f34562e2e6..047696432eb21 100644 --- a/drivers/gpu/host1x/context.c +++ b/drivers/gpu/host1x/context.c @@ -13,6 +13,11 @@ #include "context.h" #include "dev.h"
+static void host1x_memory_context_release(struct device *dev) +{ + /* context device is freed in host1x_memory_context_list_free() */ +} + int host1x_memory_context_list_init(struct host1x *host1x) { struct host1x_memory_context_list *cdl = &host1x->context_list; @@ -53,28 +58,30 @@ int host1x_memory_context_list_init(struct host1x *host1x) dev_set_name(&ctx->dev, "host1x-ctx.%d", i); ctx->dev.bus = &host1x_context_device_bus_type; ctx->dev.parent = host1x->dev; + ctx->dev.release = host1x_memory_context_release;
dma_set_max_seg_size(&ctx->dev, UINT_MAX);
err = device_add(&ctx->dev); if (err) { dev_err(host1x->dev, "could not add context device %d: %d\n", i, err); - goto del_devices; + put_device(&ctx->dev); + goto unreg_devices; }
err = of_dma_configure_id(&ctx->dev, node, true, &i); if (err) { dev_err(host1x->dev, "IOMMU configuration failed for context device %d: %d\n", i, err); - device_del(&ctx->dev); - goto del_devices; + device_unregister(&ctx->dev); + goto unreg_devices; }
fwspec = dev_iommu_fwspec_get(&ctx->dev); if (!fwspec || !device_iommu_mapped(&ctx->dev)) { dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i); - device_del(&ctx->dev); - goto del_devices; + device_unregister(&ctx->dev); + goto unreg_devices; }
ctx->stream_id = fwspec->ids[0] & 0xffff; @@ -82,9 +89,9 @@ int host1x_memory_context_list_init(struct host1x *host1x)
return 0;
-del_devices: +unreg_devices: while (i--) - device_del(&cdl->devs[i].dev); + device_unregister(&cdl->devs[i].dev);
kfree(cdl->devs); cdl->devs = NULL; @@ -98,7 +105,7 @@ void host1x_memory_context_list_free(struct host1x_memory_context_list *cdl) unsigned int i;
for (i = 0; i < cdl->len; i++) - device_del(&cdl->devs[i].dev); + device_unregister(&cdl->devs[i].dev);
kfree(cdl->devs); cdl->len = 0;