[kbuild] drivers/gpu/drm/msm/adreno/a3xx_gpu.c:600 a3xx_gpu_init() error: passing non negative 1 to ERR_PTR

From: Dan Carpenter
Date: Fri Apr 09 2021 - 05:37:57 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 2d743660786ec51f5c1fefd5782bbdee7b227db0
commit: 5785dd7a8ef0de8049f40a1a109de6a1bf17b479 drm/msm: Fix duplicate gpu node in icc summary
config: arm64-randconfig-m031-20210407 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
drivers/gpu/drm/msm/adreno/a3xx_gpu.c:600 a3xx_gpu_init() error: passing non negative 1 to ERR_PTR
drivers/gpu/drm/msm/adreno/a4xx_gpu.c:727 a4xx_gpu_init() error: passing non negative 1 to ERR_PTR

vim +600 drivers/gpu/drm/msm/adreno/a3xx_gpu.c

7198e6b03155f6 Rob Clark 2013-07-19 515 struct msm_gpu *a3xx_gpu_init(struct drm_device *dev)
7198e6b03155f6 Rob Clark 2013-07-19 516 {
7198e6b03155f6 Rob Clark 2013-07-19 517 struct a3xx_gpu *a3xx_gpu = NULL;
55459968176f13 Rob Clark 2013-12-05 518 struct adreno_gpu *adreno_gpu;
7198e6b03155f6 Rob Clark 2013-07-19 519 struct msm_gpu *gpu;
060530f1ea6740 Rob Clark 2014-03-03 520 struct msm_drm_private *priv = dev->dev_private;
060530f1ea6740 Rob Clark 2014-03-03 521 struct platform_device *pdev = priv->gpu_pdev;
5785dd7a8ef0de Akhil P Oommen 2020-10-28 522 struct icc_path *ocmem_icc_path;
5785dd7a8ef0de Akhil P Oommen 2020-10-28 523 struct icc_path *icc_path;
7198e6b03155f6 Rob Clark 2013-07-19 524 int ret;
7198e6b03155f6 Rob Clark 2013-07-19 525
7198e6b03155f6 Rob Clark 2013-07-19 526 if (!pdev) {
6a41da17e87dee Mamta Shukla 2018-10-20 527 DRM_DEV_ERROR(dev->dev, "no a3xx device\n");
7198e6b03155f6 Rob Clark 2013-07-19 528 ret = -ENXIO;
7198e6b03155f6 Rob Clark 2013-07-19 529 goto fail;
7198e6b03155f6 Rob Clark 2013-07-19 530 }
7198e6b03155f6 Rob Clark 2013-07-19 531
7198e6b03155f6 Rob Clark 2013-07-19 532 a3xx_gpu = kzalloc(sizeof(*a3xx_gpu), GFP_KERNEL);
7198e6b03155f6 Rob Clark 2013-07-19 533 if (!a3xx_gpu) {
7198e6b03155f6 Rob Clark 2013-07-19 534 ret = -ENOMEM;
7198e6b03155f6 Rob Clark 2013-07-19 535 goto fail;
7198e6b03155f6 Rob Clark 2013-07-19 536 }
7198e6b03155f6 Rob Clark 2013-07-19 537
55459968176f13 Rob Clark 2013-12-05 538 adreno_gpu = &a3xx_gpu->base;
55459968176f13 Rob Clark 2013-12-05 539 gpu = &adreno_gpu->base;
7198e6b03155f6 Rob Clark 2013-07-19 540
70c70f091b1ffd Rob Clark 2014-05-30 541 gpu->perfcntrs = perfcntrs;
70c70f091b1ffd Rob Clark 2014-05-30 542 gpu->num_perfcntrs = ARRAY_SIZE(perfcntrs);
70c70f091b1ffd Rob Clark 2014-05-30 543
3bcefb0497f9fc Rob Clark 2014-09-05 544 adreno_gpu->registers = a3xx_registers;
3bcefb0497f9fc Rob Clark 2014-09-05 545
f97decac5f4c2d Jordan Crouse 2017-10-20 546 ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 1);
7198e6b03155f6 Rob Clark 2013-07-19 547 if (ret)
7198e6b03155f6 Rob Clark 2013-07-19 548 goto fail;
7198e6b03155f6 Rob Clark 2013-07-19 549
55459968176f13 Rob Clark 2013-12-05 550 /* if needed, allocate gmem: */
55459968176f13 Rob Clark 2013-12-05 551 if (adreno_is_a330(adreno_gpu)) {
26c0b26dcd005d Brian Masney 2019-08-23 552 ret = adreno_gpu_ocmem_init(&adreno_gpu->base.pdev->dev,
26c0b26dcd005d Brian Masney 2019-08-23 553 adreno_gpu, &a3xx_gpu->ocmem);
26c0b26dcd005d Brian Masney 2019-08-23 554 if (ret)
26c0b26dcd005d Brian Masney 2019-08-23 555 goto fail;
55459968176f13 Rob Clark 2013-12-05 556 }
55459968176f13 Rob Clark 2013-12-05 557
667ce33e57d0de Rob Clark 2016-09-28 558 if (!gpu->aspace) {
871d812aa43e63 Rob Clark 2013-11-16 559 /* TODO we think it is possible to configure the GPU to
871d812aa43e63 Rob Clark 2013-11-16 560 * restrict access to VRAM carveout. But the required
871d812aa43e63 Rob Clark 2013-11-16 561 * registers are unknown. For now just bail out and
871d812aa43e63 Rob Clark 2013-11-16 562 * limp along with just modesetting. If it turns out
871d812aa43e63 Rob Clark 2013-11-16 563 * to not be possible to restrict access, then we must
871d812aa43e63 Rob Clark 2013-11-16 564 * implement a cmdstream validator.
871d812aa43e63 Rob Clark 2013-11-16 565 */
6a41da17e87dee Mamta Shukla 2018-10-20 566 DRM_DEV_ERROR(dev->dev, "No memory protection without IOMMU\n");
871d812aa43e63 Rob Clark 2013-11-16 567 ret = -ENXIO;
871d812aa43e63 Rob Clark 2013-11-16 568 goto fail;
871d812aa43e63 Rob Clark 2013-11-16 569 }
871d812aa43e63 Rob Clark 2013-11-16 570
5785dd7a8ef0de Akhil P Oommen 2020-10-28 571 icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem");
5785dd7a8ef0de Akhil P Oommen 2020-10-28 572 ret = IS_ERR(icc_path);
5785dd7a8ef0de Akhil P Oommen 2020-10-28 573 if (ret)
5785dd7a8ef0de Akhil P Oommen 2020-10-28 574 goto fail;

IS_ERR() returns/true false so this will lead to an Oops in the caller.

icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem");
if (IS_ERR(icc_path)) {
ret = PTR_ERR(icc_path);
goto fail;
}

5785dd7a8ef0de Akhil P Oommen 2020-10-28 575
5785dd7a8ef0de Akhil P Oommen 2020-10-28 576 ocmem_icc_path = devm_of_icc_get(&pdev->dev, "ocmem");
5785dd7a8ef0de Akhil P Oommen 2020-10-28 577 ret = IS_ERR(ocmem_icc_path);
5785dd7a8ef0de Akhil P Oommen 2020-10-28 578 if (ret) {
5785dd7a8ef0de Akhil P Oommen 2020-10-28 579 /* allow -ENODATA, ocmem icc is optional */
5785dd7a8ef0de Akhil P Oommen 2020-10-28 580 if (ret != -ENODATA)
5785dd7a8ef0de Akhil P Oommen 2020-10-28 581 goto fail;

Same. ret is true/false so it can't be equal to -ENODATA, plus the
caller will Oops.

Btw, this patch removed the assignments:

gpu->icc_path = of_icc_get(dev, "gfx-mem");
gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");

So I think "gpu->icc_path" and "gpu->ocmem_icc_path" are always
NULL/unused and they should be removed.

5785dd7a8ef0de Akhil P Oommen 2020-10-28 582 ocmem_icc_path = NULL;
5785dd7a8ef0de Akhil P Oommen 2020-10-28 583 }
5785dd7a8ef0de Akhil P Oommen 2020-10-28 584
5785dd7a8ef0de Akhil P Oommen 2020-10-28 585
d163ba0b65f2e4 Brian Masney 2019-11-21 586 /*
d163ba0b65f2e4 Brian Masney 2019-11-21 587 * Set the ICC path to maximum speed for now by multiplying the fastest
d163ba0b65f2e4 Brian Masney 2019-11-21 588 * frequency by the bus width (8). We'll want to scale this later on to
d163ba0b65f2e4 Brian Masney 2019-11-21 589 * improve battery life.
d163ba0b65f2e4 Brian Masney 2019-11-21 590 */
5785dd7a8ef0de Akhil P Oommen 2020-10-28 591 icc_set_bw(icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
5785dd7a8ef0de Akhil P Oommen 2020-10-28 592 icc_set_bw(ocmem_icc_path, 0, Bps_to_icc(gpu->fast_rate) * 8);
d163ba0b65f2e4 Brian Masney 2019-11-21 593
871d812aa43e63 Rob Clark 2013-11-16 594 return gpu;
7198e6b03155f6 Rob Clark 2013-07-19 595
7198e6b03155f6 Rob Clark 2013-07-19 596 fail:
7198e6b03155f6 Rob Clark 2013-07-19 597 if (a3xx_gpu)
7198e6b03155f6 Rob Clark 2013-07-19 598 a3xx_destroy(&a3xx_gpu->base.base);
7198e6b03155f6 Rob Clark 2013-07-19 599
7198e6b03155f6 Rob Clark 2013-07-19 @600 return ERR_PTR(ret);

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