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spi: spi-mem: avoid mutating op template in spi_mem_supports_op()

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spi_mem_supports_op() accepts a const struct spi_mem_op pointer but
casts away const internally to call spi_mem_adjust_op_freq(). This
mutates the caller's op template, which causes stale max_freq values
when callers reuse persistent templates - subsequent calls won't
re-apply the device frequency cap since spi_mem_adjust_op_freq()
skips non-zero values.

Fix by operating on a stack-local copy instead.

Fixes: a4f8e70d75 ("spi: spi-mem: add spi_mem_adjust_op_freq() in spi_mem_supports_op()")
Cc: Tianyu Xu <xtydtc@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Santhosh Kumar K <s-k6@ti.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://patch.msgid.link/20260527173736.2243004-1-s-k6@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Santhosh Kumar K 2026-05-27 23:07:36 +05:30 committed by Mark Brown
parent 60474437af
commit 79378db6a8
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GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 4 deletions
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15
drivers/spi/spi-mem.c
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@ -279,13 +279,20 @@ static bool spi_mem_internal_supports_op(struct spi_mem *mem,
*/
bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
/* Make sure the operation frequency is correct before going futher */
spi_mem_adjust_op_freq(mem, (struct spi_mem_op *)op);
struct spi_mem_op eval_op = *op;
if (spi_mem_check_op(op))
/*
* Work on a local copy; this is a pure capability check and must
* not modify the caller's op. Stored templates with max_freq == 0
* must remain unset so their frequency is always re-capped to the
* current device maximum at execution time.
*/
spi_mem_adjust_op_freq(mem, &eval_op);
if (spi_mem_check_op(&eval_op))
return false;
return spi_mem_internal_supports_op(mem, op);
return spi_mem_internal_supports_op(mem, &eval_op);
}
EXPORT_SYMBOL_GPL(spi_mem_supports_op);