The of_node_put on line 614 does not look useful.
julia
---------- Forwarded message ----------
Date: Mon, 22 Jan 2024 19:18:22 +0800
From: kernel test robot <lkp@xxxxxxxxx>
To: oe-kbuild@xxxxxxxxxxxxxxx
Cc: lkp@xxxxxxxxx, Julia Lawall <julia.lawall@xxxxxxxx>
Subject: [linux-next:master 139/1036]
drivers/gpu/drm/etnaviv/etnaviv_drv.c:614:3-14: ERROR: probable double put.
BCC: lkp@xxxxxxxxx
CC: oe-kbuild-all@xxxxxxxxxxxxxxx
CC: Linux Memory Management List <linux-mm@xxxxxxxxx>
TO: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
CC: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 319fbd8fc6d339e0a1c7b067eed870c518a13a02
commit: 56df40c804fa40712239478355abe265aeda2197 [139/1036] drm/etnaviv: Add a helper to get the first available GPU device node
:::::: branch date: 10 hours ago
:::::: commit date: 3 months ago
config: x86_64-randconfig-102-20240122 (https://download.01.org/0day-ci/archive/20240122/202401221903.GjEKVu8R-lkp@xxxxxxxxx/config)
compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Reported-by: Julia Lawall <julia.lawall@xxxxxxxx>
| Closes: https://lore.kernel.org/r/202401221903.GjEKVu8R-lkp@xxxxxxxxx/
cocci warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/etnaviv/etnaviv_drv.c:614:3-14: ERROR: probable double put.
vim +614 drivers/gpu/drm/etnaviv/etnaviv_drv.c
a8c21a5451d831 The etnaviv authors 2015-12-03 597
a8c21a5451d831 The etnaviv authors 2015-12-03 598 static int etnaviv_pdev_probe(struct platform_device *pdev)
a8c21a5451d831 The etnaviv authors 2015-12-03 599 {
a8c21a5451d831 The etnaviv authors 2015-12-03 600 struct device *dev = &pdev->dev;
0ea057a9cb2be4 Michael Walle 2021-09-07 601 struct device_node *first_node = NULL;
a8c21a5451d831 The etnaviv authors 2015-12-03 602 struct component_match *match = NULL;
a8c21a5451d831 The etnaviv authors 2015-12-03 603
246774d17fc05a Lucas Stach 2018-01-24 604 if (!dev->platform_data) {
a8c21a5451d831 The etnaviv authors 2015-12-03 605 struct device_node *core_node;
a8c21a5451d831 The etnaviv authors 2015-12-03 606
246774d17fc05a Lucas Stach 2018-01-24 607 for_each_compatible_node(core_node, NULL, "vivante,gc") {
246774d17fc05a Lucas Stach 2018-01-24 608 if (!of_device_is_available(core_node))
246774d17fc05a Lucas Stach 2018-01-24 609 continue;
a8c21a5451d831 The etnaviv authors 2015-12-03 610
97ac0e47aed5f6 Russell King 2016-10-19 611 drm_of_component_match_add(&pdev->dev, &match,
0a522394202f1f Yong Wu 2022-02-14 612 component_compare_of, core_node);
56df40c804fa40 Sui Jingfeng 2023-10-02 613
56df40c804fa40 Sui Jingfeng 2023-10-02 @614 of_node_put(core_node);
a8c21a5451d831 The etnaviv authors 2015-12-03 615 }
246774d17fc05a Lucas Stach 2018-01-24 616 } else {
a8c21a5451d831 The etnaviv authors 2015-12-03 617 char **names = dev->platform_data;
a8c21a5451d831 The etnaviv authors 2015-12-03 618 unsigned i;
a8c21a5451d831 The etnaviv authors 2015-12-03 619
a8c21a5451d831 The etnaviv authors 2015-12-03 620 for (i = 0; names[i]; i++)
0a522394202f1f Yong Wu 2022-02-14 621 component_match_add(dev, &match, component_compare_dev_name, names[i]);
a8c21a5451d831 The etnaviv authors 2015-12-03 622 }
a8c21a5451d831 The etnaviv authors 2015-12-03 623
f5be833dc86f49 Michael Walle 2021-09-07 624 /*
f5be833dc86f49 Michael Walle 2021-09-07 625 * PTA and MTLB can have 40 bit base addresses, but
f5be833dc86f49 Michael Walle 2021-09-07 626 * unfortunately, an entry in the MTLB can only point to a
f5be833dc86f49 Michael Walle 2021-09-07 627 * 32 bit base address of a STLB. Moreover, to initialize the
f5be833dc86f49 Michael Walle 2021-09-07 628 * MMU we need a command buffer with a 32 bit address because
f5be833dc86f49 Michael Walle 2021-09-07 629 * without an MMU there is only an indentity mapping between
f5be833dc86f49 Michael Walle 2021-09-07 630 * the internal 32 bit addresses and the bus addresses.
f5be833dc86f49 Michael Walle 2021-09-07 631 *
f5be833dc86f49 Michael Walle 2021-09-07 632 * To make things easy, we set the dma_coherent_mask to 32
f5be833dc86f49 Michael Walle 2021-09-07 633 * bit to make sure we are allocating the command buffers and
f5be833dc86f49 Michael Walle 2021-09-07 634 * TLBs in the lower 4 GiB address space.
f5be833dc86f49 Michael Walle 2021-09-07 635 */
f5be833dc86f49 Michael Walle 2021-09-07 636 if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(40)) ||
f5be833dc86f49 Michael Walle 2021-09-07 637 dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32))) {
f5be833dc86f49 Michael Walle 2021-09-07 638 dev_dbg(&pdev->dev, "No suitable DMA available\n");
f5be833dc86f49 Michael Walle 2021-09-07 639 return -ENODEV;
f5be833dc86f49 Michael Walle 2021-09-07 640 }
f5be833dc86f49 Michael Walle 2021-09-07 641
0ea057a9cb2be4 Michael Walle 2021-09-07 642 /*
0ea057a9cb2be4 Michael Walle 2021-09-07 643 * Apply the same DMA configuration to the virtual etnaviv
0ea057a9cb2be4 Michael Walle 2021-09-07 644 * device as the GPU we found. This assumes that all Vivante
0ea057a9cb2be4 Michael Walle 2021-09-07 645 * GPUs in the system share the same DMA constraints.
0ea057a9cb2be4 Michael Walle 2021-09-07 646 */
56df40c804fa40 Sui Jingfeng 2023-10-02 647 first_node = etnaviv_of_first_available_node();
56df40c804fa40 Sui Jingfeng 2023-10-02 648 if (first_node) {
0ea057a9cb2be4 Michael Walle 2021-09-07 649 of_dma_configure(&pdev->dev, first_node, true);
56df40c804fa40 Sui Jingfeng 2023-10-02 650 of_node_put(first_node);
56df40c804fa40 Sui Jingfeng 2023-10-02 651 }
0ea057a9cb2be4 Michael Walle 2021-09-07 652
a8c21a5451d831 The etnaviv authors 2015-12-03 653 return component_master_add_with_match(dev, &etnaviv_master_ops, match);
a8c21a5451d831 The etnaviv authors 2015-12-03 654 }
a8c21a5451d831 The etnaviv authors 2015-12-03 655
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