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authorMatthew Auld <matthew.auld@intel.com>2020-03-05 20:35:34 +0000
committerJani Nikula <jani.nikula@intel.com>2020-03-11 23:12:39 +0200
commit1d61c5d711a2dc0b978ae905535edee9601f9449 (patch)
treec6977b87f9ca7d15c83db9a8804c396375607292 /drivers/gpu
parent259170cb4c84f4165a36c0b05811eb74c495412c (diff)
downloadlinux-1d61c5d711a2dc0b978ae905535edee9601f9449.tar.bz2
drm/i915: be more solid in checking the alignment
The alignment is u64, and yet is_power_of_2() assumes unsigned long, which might give different results between 32b and 64b kernel. Signed-off-by: Matthew Auld <matthew.auld@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20200305203534.210466-1-matthew.auld@intel.com Cc: stable@vger.kernel.org (cherry picked from commit 2920516b2f719546f55079bc39a7fe409d9e80ab) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c3
-rw-r--r--drivers/gpu/drm/i915/i915_utils.h5
2 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 60c984e10c4a..7643a30ba4cd 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -423,7 +423,8 @@ eb_validate_vma(struct i915_execbuffer *eb,
if (unlikely(entry->flags & eb->invalid_flags))
return -EINVAL;
- if (unlikely(entry->alignment && !is_power_of_2(entry->alignment)))
+ if (unlikely(entry->alignment &&
+ !is_power_of_2_u64(entry->alignment)))
return -EINVAL;
/*
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
index b0ade76bec90..d34141f7dcd8 100644
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -234,6 +234,11 @@ static inline u64 ptr_to_u64(const void *ptr)
__idx; \
})
+static inline bool is_power_of_2_u64(u64 n)
+{
+ return (n != 0 && ((n & (n - 1)) == 0));
+}
+
static inline void __list_del_many(struct list_head *head,
struct list_head *first)
{