* Re: [linux-next:master 8309/10976] drivers/gpu/host1x/context.c:82 host1x_memory_context_list_init() warn: missing error code 'err'
[not found] <ac98d66d-8735-4963-8cdb-be891d134cb3@kili.mountain>
@ 2023-04-13 8:57 ` Thierry Reding
2023-04-13 9:05 ` Dan Carpenter
0 siblings, 1 reply; 3+ messages in thread
From: Thierry Reding @ 2023-04-13 8:57 UTC (permalink / raw)
To: Dan Carpenter
Cc: oe-kbuild, Christian König, lkp, oe-kbuild-all,
Linux Memory Management List
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On Thu, Apr 13, 2023 at 08:06:08AM +0300, Dan Carpenter wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head: 7d8214bba44c1aa6a75921a09a691945d26a8d43
> commit: f75d19827b731c6f24930ef77e5a46cf2242bc68 [8309/10976] drm/tegra: Allow compile test on !ARM v2
> config: xtensa-randconfig-m041-20230411 (https://download.01.org/0day-ci/archive/20230413/202304131214.MOOEMszN-lkp@intel.com/config)
> compiler: xtensa-linux-gcc (GCC) 12.1.0
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> | Reported-by: Dan Carpenter <error27@gmail.com>
> | Link: https://lore.kernel.org/r/202304131214.MOOEMszN-lkp@intel.com/
>
> smatch warnings:
> drivers/gpu/host1x/context.c:82 host1x_memory_context_list_init() warn: missing error code 'err'
>
> vim +/err +82 drivers/gpu/host1x/context.c
>
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 21 int host1x_memory_context_list_init(struct host1x *host1x)
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 22 {
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 23 struct host1x_memory_context_list *cdl = &host1x->context_list;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 24 struct device_node *node = host1x->dev->of_node;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 25 struct host1x_memory_context *ctx;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 26 unsigned int i;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 27 int err;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 28
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 29 cdl->devs = NULL;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 30 cdl->len = 0;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 31 mutex_init(&cdl->lock);
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 32
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 33 err = of_property_count_u32_elems(node, "iommu-map");
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 34 if (err < 0)
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 35 return 0;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 36
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 37 cdl->devs = kcalloc(err, sizeof(*cdl->devs), GFP_KERNEL);
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 38 if (!cdl->devs)
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 39 return -ENOMEM;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 40 cdl->len = err / 4;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 41
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 42 for (i = 0; i < cdl->len; i++) {
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 43 ctx = &cdl->devs[i];
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 44
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 45 ctx->host = host1x;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 46
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 47 device_initialize(&ctx->dev);
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 48
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 49 /*
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 50 * Due to an issue with T194 NVENC, only 38 bits can be used.
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 51 * Anyway, 256GiB of IOVA ought to be enough for anyone.
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 52 */
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 53 ctx->dma_mask = DMA_BIT_MASK(38);
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 54 ctx->dev.dma_mask = &ctx->dma_mask;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 55 ctx->dev.coherent_dma_mask = ctx->dma_mask;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 56 dev_set_name(&ctx->dev, "host1x-ctx.%d", i);
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 57 ctx->dev.bus = &host1x_context_device_bus_type;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 58 ctx->dev.parent = host1x->dev;
> 55879dad0f3ae8 Yang Yingliang 2022-11-26 59 ctx->dev.release = host1x_memory_context_release;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 60
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 61 dma_set_max_seg_size(&ctx->dev, UINT_MAX);
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 62
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 63 err = device_add(&ctx->dev);
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 64 if (err) {
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 65 dev_err(host1x->dev, "could not add context device %d: %d\n", i, err);
> 55879dad0f3ae8 Yang Yingliang 2022-11-26 66 put_device(&ctx->dev);
> 55879dad0f3ae8 Yang Yingliang 2022-11-26 67 goto unreg_devices;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 68 }
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 69
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 70 err = of_dma_configure_id(&ctx->dev, node, true, &i);
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 71 if (err) {
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 72 dev_err(host1x->dev, "IOMMU configuration failed for context device %d: %d\n",
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 73 i, err);
> 55879dad0f3ae8 Yang Yingliang 2022-11-26 74 device_unregister(&ctx->dev);
> 55879dad0f3ae8 Yang Yingliang 2022-11-26 75 goto unreg_devices;
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 76 }
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 77
> 9026ba722360ce Thierry Reding 2022-11-17 78 if (!tegra_dev_iommu_get_stream_id(&ctx->dev, &ctx->stream_id) ||
> 9026ba722360ce Thierry Reding 2022-11-17 79 !device_iommu_mapped(&ctx->dev)) {
> 8aa5bcb6161206 Mikko Perttunen 2022-06-27 80 dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i);
> 55879dad0f3ae8 Yang Yingliang 2022-11-26 81 device_unregister(&ctx->dev);
> 55879dad0f3ae8 Yang Yingliang 2022-11-26 @82 goto unreg_devices;
>
> error code?
We don't actually want this to be a fatal failure, so err = 0 is what we
want here. Should we set err = 0 explicitly here to appease smatch?
Thierry
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