Re: [PATCH 09/24] serial: 8250: 8250_bcm7271: fix DMA address truncation to 32 bits

[Andy Shevchenko]

On Tue, Oct 27, 2026 at 12:06:35PM +0100, Greg Kroah-Hartman wrote:
> 
> The local variable daddr is declared as u32 but assigned from dma_addr_t
> fields (priv->rx_addr and priv->tx_addr), which are 64-bit on ARM64.
> This silently truncates the upper 32 bits, causing upper_32_bits(daddr)
> to always produce zero when programming the UART DMA descriptor high
> address registers.  Change the type to dma_addr_t to preserve the full
> DMA address.

Since this value goes to HW, it should be u64. Even on 32-bit machines there
are possibilities to cover a bigger address space / DMA space.

-- 
With Best Regards,
Andy Shevchenko