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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240625-ucsi-rework-interface-v3-7-7a6c8e17be3a@linaro.org> References: <20240625-ucsi-rework-interface-v3-0-7a6c8e17be3a@linaro.org> In-Reply-To: <20240625-ucsi-rework-interface-v3-0-7a6c8e17be3a@linaro.org> To: Heikki Krogerus , Greg Kroah-Hartman , Maxime Coquelin , Alexandre Torgue Cc: Nikita Travkin , Neil Armstrong , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2070; i=dmitry.baryshkov@linaro.org; h=from:subject:message-id; bh=c1mFXRw/1F7jX+PLOZli37YidJtYzYIZwD0eERkZXpg=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBmetokKTBUAvA860F4TZ7LaGT2vn3//h0eO5fRP eXnVpE4f++JATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCZnraJAAKCRCLPIo+Aiko 1Y7VCACNYuSM7sEYoqQvGqND2MRdAoZLFky1iBiqT6oimIP7qis1KVCv3F+gBFz/bdKtij+cztp Z5awCnGfW7Httm4zKIIT7NjJpuUDn4ia7oZOW3FAe99Zdq92p1EKUvXKnXApxNz6eom/iOY7qGH ZuClKE5VA15dUN4sl0zW6TTatSGt7zTfkToJ2jq8u83k9ID/maCxlb5V8FISVxuKEqgOJwLGGoE OvAeeooTh9x2NFAt/eeMWZ2D8kgVxeDZw+j5aVfO6x8v8emzAdbZuHaM+qRTH+T7uUXJOiJNXkB 9HVHfVpFVz76fdbmU925vbf0ul+6bFBUI9SNsbusDr5OPJul X-Developer-Key: i=dmitry.baryshkov@linaro.org; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A Streamline control stream of ucsi_run_command(). Reorder operations so that there is only one call to ucsi_acknowledge(), making sure that all complete commands are acknowledged. This also makes sure that the command is acknowledged even if reading MESSAGE_IN data returns an error. Signed-off-by: Dmitry Baryshkov --- drivers/usb/typec/ucsi/ucsi.c | 34 ++++++++++++++-------------------- 1 file changed, 14 insertions(+), 20 deletions(-) diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c index 3fb5d3a52b80..0d091f06abd3 100644 --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -95,7 +95,7 @@ static int ucsi_acknowledge(struct ucsi *ucsi, bool conn_= ack) static int ucsi_run_command(struct ucsi *ucsi, u64 command, u32 *cci, void *data, size_t size, bool conn_ack) { - int ret; + int ret, err; =20 *cci =3D 0; =20 @@ -120,30 +120,24 @@ static int ucsi_run_command(struct ucsi *ucsi, u64 co= mmand, u32 *cci, if (!(*cci & UCSI_CCI_COMMAND_COMPLETE)) return -EIO; =20 - if (*cci & UCSI_CCI_NOT_SUPPORTED) { - if (ucsi_acknowledge(ucsi, false) < 0) - dev_err(ucsi->dev, - "ACK of unsupported command failed\n"); - return -EOPNOTSUPP; - } - - if (*cci & UCSI_CCI_ERROR) { - /* Acknowledge the command that failed */ - ret =3D ucsi_acknowledge(ucsi, false); - return ret ? ret : -EIO; - } + if (*cci & UCSI_CCI_NOT_SUPPORTED) + err =3D -EOPNOTSUPP; + else if (*cci & UCSI_CCI_ERROR) + err =3D -EIO; + else + err =3D 0; =20 - if (data) { - ret =3D ucsi->ops->read_message_in(ucsi, data, size); - if (ret) - return ret; - } + if (!err && data && UCSI_CCI_LENGTH(*cci)) + err =3D ucsi->ops->read_message_in(ucsi, data, size); =20 - ret =3D ucsi_acknowledge(ucsi, conn_ack); + /* + * Don't ACK connection change if there was an error. + */ + ret =3D ucsi_acknowledge(ucsi, err ? false : conn_ack); if (ret) return ret; =20 - return 0; + return err; } =20 static int ucsi_read_error(struct ucsi *ucsi) --=20 2.39.2