net: stmmac: convert DMA address to lower 32 before assignment

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In jumbo_frm() (implemented in both "chain_mode.c" and "ring_mode.c"),
there are places where a DMA descriptor is converted to little-endian
byte order in assignment.  The DMA descriptor could be a 64-bit value,
which makes the 32-bit byte swapping operation seem a little sketchy.

Explicitly extract the low-order 32 bits of the dma_addr_t value being
converted into a u32 so it's crystal clear that we're doing the right
thing.

Suggested-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: Alex Elder <elder@riscstar.com>
Link: https://patch.msgid.link/20260812163832.271742-3-elder@riscstar.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Alex Elder 2026-08-12 11:38:31 -05:00 • committed by Jakub Kicinski

parent 0c1f9020d2

commit c11c497af8

2 changed files with 9 additions and 9 deletions

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6

drivers/net/ethernet/stmicro/stmmac/chain_mode.c

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12

drivers/net/ethernet/stmicro/stmmac/ring_mode.c

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