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am65-cpsw: avoid null pointer arithmetic

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clang warns about arithmetic on NULL pointers:

drivers/net/ethernet/ti/am65-cpsw-ethtool.c:71:2: error: performing pointer subtraction with a null pointer has undefined behavior [-Werror,-Wnull-pointer-subtraction]
        AM65_CPSW_REGDUMP_REC(AM65_CPSW_REGDUMP_MOD_NUSS, 0x0, 0x1c),
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/ethernet/ti/am65-cpsw-ethtool.c:64:29: note: expanded from macro 'AM65_CPSW_REGDUMP_REC'
        .hdr.len = (((u32 *)(end)) - ((u32 *)(start)) + 1) * sizeof(u32) * 2 + \
                                   ^ ~~~~~~~~~~~~~~~~

The expression here is easily changed to a calculation based on integers
that is no less readable.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2021-09-27 11:37:57 +02:00 committed by David S. Miller
parent f43bed7193
commit 861f40fa0e
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/ti/am65-cpsw-ethtool.c
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@ -61,7 +61,7 @@ struct am65_cpsw_regdump_item {
#define AM65_CPSW_REGDUMP_REC(mod, start, end) { \
.hdr.module_id = (mod), \
.hdr.len = (((u32 *)(end)) - ((u32 *)(start)) + 1) * sizeof(u32) * 2 + \
.hdr.len = (end + 4 - start) * 2 + \
sizeof(struct am65_cpsw_regdump_hdr), \
.start_ofs = (start), \
.end_ofs = end, \