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drm/amdkfd: fix sysfs topology prop length on buffer truncation

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sysfs_show_gen_prop() accumulated snprintf()'s return value into the
offset. snprintf() reports bytes that would have been written, not
bytes actually written, so a truncated sysfs show could over-report
its length. Use sysfs_emit_at(), which returns only the bytes written.

Signed-off-by: Yongqiang Sun <Yongqiang.Sun@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Yongqiang Sun 2026-06-01 15:48:44 -04:00 committed by Alex Deucher
parent 342981fff3
commit 8bfd3aeeb7
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/amd/amdkfd/kfd_topology.c
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@ -198,8 +198,7 @@ struct kfd_topology_device *kfd_create_topology_device(
#define sysfs_show_gen_prop(buffer, offs, fmt, ...) \
(offs += snprintf(buffer+offs, PAGE_SIZE-offs, \
fmt, __VA_ARGS__))
(offs += sysfs_emit_at(buffer, offs, fmt, __VA_ARGS__))
#define sysfs_show_32bit_prop(buffer, offs, name, value) \
sysfs_show_gen_prop(buffer, offs, "%s %u\n", name, value)
#define sysfs_show_64bit_prop(buffer, offs, name, value) \