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Subject[PATCH] drm/dsi: Fix improper use of mipi_dsi_device_transfer() return value
Date
The function mipi_dsi_device_transfer() returns the number of transmitted
or received bytes on success or a negative error code on failure.

The functions mipi_dsi_shutdown_peripheral(), mipi_dsi_turn_on_peripheral() &
mipi_dsi_set_maximum_return_packet_size() use improperly this returned
value in case of success: 0 should be returned instead of the number of
transmitted bytes.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
---
drivers/gpu/drm/drm_mipi_dsi.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 4b47226b90d4..bc73b7f5b9fc 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -498,8 +498,9 @@ int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
.tx_buf = (u8 [2]) { 0, 0 },
.tx_len = 2,
};
+ int ret = mipi_dsi_device_transfer(dsi, &msg);

- return mipi_dsi_device_transfer(dsi, &msg);
+ return (ret < 0) ? ret : 0;
}
EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);

@@ -517,8 +518,9 @@ int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
.tx_buf = (u8 [2]) { 0, 0 },
.tx_len = 2,
};
+ int ret = mipi_dsi_device_transfer(dsi, &msg);

- return mipi_dsi_device_transfer(dsi, &msg);
+ return (ret < 0) ? ret : 0;
}
EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);

@@ -541,8 +543,9 @@ int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
.tx_len = sizeof(tx),
.tx_buf = tx,
};
+ int ret = mipi_dsi_device_transfer(dsi, &msg);

- return mipi_dsi_device_transfer(dsi, &msg);
+ return (ret < 0) ? ret : 0;
}
EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);

--
2.15.1
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