tpm: tis_i2c: Limit write bursts to I2C_SMBUS_BLOCK_MAX (32) bytes

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commit 83e7e5d89f upstream.

Underlying I2C bus drivers not always support longer transfers and
imx-lpi2c for instance doesn't. The fix is symmetric to previous patch
which fixed the read direction.

Cc: stable@vger.kernel.org # v5.20+
Fixes: bbc23a07b0 ("tpm: Add tpm_tis_i2c backend for tpm_tis_core")
Tested-by: Michael Haener <michael.haener@siemens.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Alexander Sverdlin 2023-05-24 17:40:40 +02:00 • committed by Greg Kroah-Hartman

parent 6005760289

commit 70c001a67e

1 changed files with 15 additions and 7 deletions

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drivers/char/tpm/tpm_tis_i2c.c

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