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[6.12.y,50/60] drm/panic: remove unnecessary borrow in alignment_pattern

Message ID 20250307225008.779961-51-ojeda@kernel.org
State New
Headers show
Series `alloc`, `#[expect]` and "Custom FFI" | expand

Commit Message

Miguel Ojeda March 7, 2025, 10:49 p.m. UTC 
From: Thomas Böhler <witcher@wiredspace.de>

commit 7b6de57e0b2d1e62becfa3aac063c4c58d2c2c42 upstream.

The function `alignment_pattern` returns a static reference to a `u8`
slice. The borrow of the returned element in `ALIGNMENT_PATTERNS` is
already a reference as defined in the array definition above so this
borrow is unnecessary and removed by the compiler. Clippy notes this in
`needless_borrow`:

    error: this expression creates a reference which is immediately dereferenced by the compiler
       --> drivers/gpu/drm/drm_panic_qr.rs:245:9
        |
    245 |         &ALIGNMENT_PATTERNS[self.0 - 1]
        |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: change this to: `ALIGNMENT_PATTERNS[self.0 - 1]`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow
        = note: `-D clippy::needless-borrow` implied by `-D warnings`
        = help: to override `-D warnings` add `#[allow(clippy::needless_borrow)]`

Remove the unnecessary borrow.

Fixes: cb5164ac43d0 ("drm/panic: Add a QR code panic screen")
Reported-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://github.com/Rust-for-Linux/linux/issues/1123
Signed-off-by: Thomas Böhler <witcher@wiredspace.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20241019084048.22336-3-witcher@wiredspace.de
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 drivers/gpu/drm/drm_panic_qr.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/gpu/drm/drm_panic_qr.rs b/drivers/gpu/drm/drm_panic_qr.rs
index 25edc69f8e22..ce245d6b9b91 100644
--- a/drivers/gpu/drm/drm_panic_qr.rs
+++ b/drivers/gpu/drm/drm_panic_qr.rs
@@ -239,7 +239,7 @@  fn g1_blk_size(&self) -> usize {
     }
 
     fn alignment_pattern(&self) -> &'static [u8] {
-        &ALIGNMENT_PATTERNS[self.0 - 1]
+        ALIGNMENT_PATTERNS[self.0 - 1]
     }
 
     fn poly(&self) -> &'static [u8] {