tpm: tis_i2c: Limit write bursts to I2C_SMBUS_BLOCK_MAX (32) bytes
authorAlexander Sverdlin <alexander.sverdlin@siemens.com>
Wed, 24 May 2023 15:40:40 +0000 (17:40 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 23 Jul 2023 11:49:31 +0000 (13:49 +0200)
commitad249709d2747c127b02d456f058990c0ad3ae6d
tree798dc687710c8baa0a8e871da81088f92d22770e
parentf5a734a689e80c24671456ee3898dc0d68cfe51a
tpm: tis_i2c: Limit write bursts to I2C_SMBUS_BLOCK_MAX (32) bytes

commit 83e7e5d89f04d1c417492940f7922bc8416a8cc4 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: bbc23a07b072 ("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>
drivers/char/tpm/tpm_tis_i2c.c