[agd5f:drm-next 17/66] drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2416:7: warning: variable 'ras_obj' is used uninitialized whenever '||' condition is true

From: kernel test robot
Date: Thu Feb 17 2022 - 02:27:20 EST

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tree: https://gitlab.freedesktop.org/agd5f/linux.git drm-next
head: 5bbebaae14913a4180ff0cc7ddccfa177dba9705
commit: 563285c85ecaa1fcecf304dabf87cbeee1ddbc3f [17/66] drm/amdgpu: Merge amdgpu_ras_late_init/amdgpu_ras_late_fini to amdgpu_ras_block_late_init/amdgpu_ras_block_late_fini
config: s390-randconfig-r003-20220216 (https://download.01.org/0day-ci/archive/20220217/202202171534.A4Lb31Xv-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0bad7cb56526f2572c74449fcf97c1fcda42b41d)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
git remote add agd5f https://gitlab.freedesktop.org/agd5f/linux.git
git fetch --no-tags agd5f drm-next
git checkout 563285c85ecaa1fcecf304dabf87cbeee1ddbc3f
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/gpu/drm/amd/amdgpu/

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

All warnings (new ones prefixed by >>):

In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:32:
In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52:
In file included from include/linux/pci.h:39:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:32:
In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52:
In file included from include/linux/pci.h:39:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:32:
In file included from drivers/gpu/drm/amd/amdgpu/../amdgpu/amdgpu.h:52:
In file included from include/linux/pci.h:39:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2416:7: warning: variable 'ras_obj' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (adev->in_suspend || amdgpu_in_reset(adev)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2453:6: note: uninitialized use occurs here
if (ras_obj->ras_cb)
^~~~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2416:3: note: remove the 'if' if its condition is always false
if (adev->in_suspend || amdgpu_in_reset(adev)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2416:7: warning: variable 'ras_obj' is used uninitialized whenever '||' condition is true [-Wsometimes-uninitialized]
if (adev->in_suspend || amdgpu_in_reset(adev)) {
^~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2453:6: note: uninitialized use occurs here
if (ras_obj->ras_cb)
^~~~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2416:7: note: remove the '||' if its condition is always false
if (adev->in_suspend || amdgpu_in_reset(adev)) {
^~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:2403:41: note: initialize the variable 'ras_obj' to silence this warning
struct amdgpu_ras_block_object *ras_obj;
^
= NULL
14 warnings generated.

vim +2416 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

e43488493cbb46 Tao Zhou 2021-09-17 2398
b293e891b05701 Hawking Zhang 2019-08-30 2399 /* helper function to handle common stuff in ip late init phase */
563285c85ecaa1 yipechai 2022-02-09 2400 int amdgpu_ras_block_late_init(struct amdgpu_device *adev,
563285c85ecaa1 yipechai 2022-02-09 2401 struct ras_common_if *ras_block)
b293e891b05701 Hawking Zhang 2019-08-30 2402 {
563285c85ecaa1 yipechai 2022-02-09 2403 struct amdgpu_ras_block_object *ras_obj;
05adfd80cc52e0 Luben Tuikov 2021-05-21 2404 struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
05adfd80cc52e0 Luben Tuikov 2021-05-21 2405 unsigned long ue_count, ce_count;
b293e891b05701 Hawking Zhang 2019-08-30 2406 int r;
b293e891b05701 Hawking Zhang 2019-08-30 2407
b293e891b05701 Hawking Zhang 2019-08-30 2408 /* disable RAS feature per IP block if it is not supported */
b293e891b05701 Hawking Zhang 2019-08-30 2409 if (!amdgpu_ras_is_supported(adev, ras_block->block)) {
b293e891b05701 Hawking Zhang 2019-08-30 2410 amdgpu_ras_feature_enable_on_boot(adev, ras_block, 0);
b293e891b05701 Hawking Zhang 2019-08-30 2411 return 0;
b293e891b05701 Hawking Zhang 2019-08-30 2412 }
b293e891b05701 Hawking Zhang 2019-08-30 2413
b293e891b05701 Hawking Zhang 2019-08-30 2414 r = amdgpu_ras_feature_enable_on_boot(adev, ras_block, 1);
b293e891b05701 Hawking Zhang 2019-08-30 2415 if (r) {
9080a18fc554ce Candice Li 2021-09-15 @2416 if (adev->in_suspend || amdgpu_in_reset(adev)) {
b293e891b05701 Hawking Zhang 2019-08-30 2417 /* in resume phase, if fail to enable ras,
b293e891b05701 Hawking Zhang 2019-08-30 2418 * clean up all ras fs nodes, and disable ras */
b293e891b05701 Hawking Zhang 2019-08-30 2419 goto cleanup;
b293e891b05701 Hawking Zhang 2019-08-30 2420 } else
b293e891b05701 Hawking Zhang 2019-08-30 2421 return r;
b293e891b05701 Hawking Zhang 2019-08-30 2422 }
b293e891b05701 Hawking Zhang 2019-08-30 2423
134d16d50f0948 John Clements 2021-03-25 2424 /* check for errors on warm reset edc persisant supported ASIC */
134d16d50f0948 John Clements 2021-03-25 2425 amdgpu_persistent_edc_harvesting(adev, ras_block);
134d16d50f0948 John Clements 2021-03-25 2426
b293e891b05701 Hawking Zhang 2019-08-30 2427 /* in resume phase, no need to create ras fs node */
53b3f8f40e6cff Dennis Li 2020-08-19 2428 if (adev->in_suspend || amdgpu_in_reset(adev))
b293e891b05701 Hawking Zhang 2019-08-30 2429 return 0;
b293e891b05701 Hawking Zhang 2019-08-30 2430
563285c85ecaa1 yipechai 2022-02-09 2431 ras_obj = container_of(ras_block, struct amdgpu_ras_block_object, ras_comm);
563285c85ecaa1 yipechai 2022-02-09 2432 if (ras_obj->ras_cb) {
9252d33df597a6 yipechai 2022-02-09 2433 r = amdgpu_ras_interrupt_add_handler(adev, ras_block);
b293e891b05701 Hawking Zhang 2019-08-30 2434 if (r)
b293e891b05701 Hawking Zhang 2019-08-30 2435 goto interrupt;
b293e891b05701 Hawking Zhang 2019-08-30 2436 }
b293e891b05701 Hawking Zhang 2019-08-30 2437
9252d33df597a6 yipechai 2022-02-09 2438 r = amdgpu_ras_sysfs_create(adev, ras_block);
b293e891b05701 Hawking Zhang 2019-08-30 2439 if (r)
b293e891b05701 Hawking Zhang 2019-08-30 2440 goto sysfs;
b293e891b05701 Hawking Zhang 2019-08-30 2441
05adfd80cc52e0 Luben Tuikov 2021-05-21 2442 /* Those are the cached values at init.
05adfd80cc52e0 Luben Tuikov 2021-05-21 2443 */
4d9f771e111ee0 Luben Tuikov 2021-07-02 2444 if (amdgpu_ras_query_error_count(adev, &ce_count, &ue_count) == 0) {
05adfd80cc52e0 Luben Tuikov 2021-05-21 2445 atomic_set(&con->ras_ce_count, ce_count);
05adfd80cc52e0 Luben Tuikov 2021-05-21 2446 atomic_set(&con->ras_ue_count, ue_count);
4d9f771e111ee0 Luben Tuikov 2021-07-02 2447 }
05adfd80cc52e0 Luben Tuikov 2021-05-21 2448
b293e891b05701 Hawking Zhang 2019-08-30 2449 return 0;
b293e891b05701 Hawking Zhang 2019-08-30 2450 cleanup:
b293e891b05701 Hawking Zhang 2019-08-30 2451 amdgpu_ras_sysfs_remove(adev, ras_block);
b293e891b05701 Hawking Zhang 2019-08-30 2452 sysfs:
563285c85ecaa1 yipechai 2022-02-09 2453 if (ras_obj->ras_cb)
9252d33df597a6 yipechai 2022-02-09 2454 amdgpu_ras_interrupt_remove_handler(adev, ras_block);
b293e891b05701 Hawking Zhang 2019-08-30 2455 interrupt:
b293e891b05701 Hawking Zhang 2019-08-30 2456 amdgpu_ras_feature_enable(adev, ras_block, 0);
b293e891b05701 Hawking Zhang 2019-08-30 2457 return r;
b293e891b05701 Hawking Zhang 2019-08-30 2458 }
b293e891b05701 Hawking Zhang 2019-08-30 2459

:::::: The code at line 2416 was first introduced by commit
:::::: 9080a18fc554cea0858fae6692a7003c5f0365fc drm/amdgpu: Remove all code paths under the EAGAIN path in RAS late init

:::::: TO: Candice Li <candice.li@xxxxxxx>
:::::: CC: Alex Deucher <alexander.deucher@xxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Next message: Greg KH: "Re: [PATCH] mm: fix dereference a null pointer in migrate[_huge]_page_move_mapping()"
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