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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/mlx5/doorbell.h
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..
@@ -36,46 +36,25 @@
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 #define MLX5_BF_OFFSET	      0x800
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 #define MLX5_CQ_DOORBELL      0x20
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-#if BITS_PER_LONG == 64
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 /* Assume that we can just write a 64-bit doorbell atomically.  s390
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  * actually doesn't have writeq() but S/390 systems don't even have
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  * PCI so we won't worry about it.
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+ *
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+ * Note that the write is not atomic on 32-bit systems! In contrast to 64-bit
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+ * ones, it requires proper locking. mlx5_write64 doesn't do any locking, so use
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+ * it at your own discretion, protected by some kind of lock on 32 bits.
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+ *
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+ * TODO: use write{q,l}_relaxed()
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  */
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-#define MLX5_DECLARE_DOORBELL_LOCK(name)
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-#define MLX5_INIT_DOORBELL_LOCK(ptr)    do { } while (0)
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-#define MLX5_GET_DOORBELL_LOCK(ptr)      (NULL)
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-
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-static inline void mlx5_write64(__be32 val[2], void __iomem *dest,
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-				spinlock_t *doorbell_lock)
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+static inline void mlx5_write64(__be32 val[2], void __iomem *dest)
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 {
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+#if BITS_PER_LONG == 64
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 	__raw_writeq(*(u64 *)val, dest);
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-}
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-
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 #else
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-
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-/* Just fall back to a spinlock to protect the doorbell if
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- * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit
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- * MMIO writes.
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- */
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-
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-#define MLX5_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
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-#define MLX5_INIT_DOORBELL_LOCK(ptr)     spin_lock_init(ptr)
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-#define MLX5_GET_DOORBELL_LOCK(ptr)      (ptr)
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-
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-static inline void mlx5_write64(__be32 val[2], void __iomem *dest,
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-				spinlock_t *doorbell_lock)
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-{
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-	unsigned long flags;
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-
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-	if (doorbell_lock)
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-		spin_lock_irqsave(doorbell_lock, flags);
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 	__raw_writel((__force u32) val[0], dest);
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 	__raw_writel((__force u32) val[1], dest + 4);
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-	if (doorbell_lock)
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-		spin_unlock_irqrestore(doorbell_lock, flags);
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-}
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-
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 #endif
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+}
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 #endif /* MLX5_DOORBELL_H */