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Subject[PATCH 4.19 048/639] staging: comedi: ni_mio_common: protect register write overflow
Date
From: Spencer E. Olson <olsonse@umich.edu>

[ Upstream commit 1cbca5852d6c16e85a21487a15d211195aacd4a1 ]

Fixes two problems introduced as early as
commit 03aef4b6dc12 ("Staging: comedi: add ni_mio_common code"):
(1) Ensures that the last four bits of NISTC_RTSI_TRIGB_OUT_REG register is
not unduly overwritten on e-series devices. On e-series devices, the
first three of the last four bits are reserved. The last bit defines
the output selection of the RGOUT0 pin, otherwise known as
RTSI_Sub_Selection. For m-series devices, these last four bits are
indeed used as the output selection of the RTSI7 pin (and the
RTSI_Sub_Selection bit for the RGOUT0 pin is moved to the
RTSI_Trig_Direction register.
(2) Allows all 4 RTSI_BRD lines to be treated as valid sources for RTSI
lines.

This patch also cleans up the ni_get_rtsi_routing command for readability.

Fixes: 03aef4b6dc12 ("Staging: comedi: add ni_mio_common code")
Signed-off-by: Spencer E. Olson <olsonse@umich.edu>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../staging/comedi/drivers/ni_mio_common.c | 24 +++++++++++++------
1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index d799b1b55de39..747518c295427 100644
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -4984,7 +4984,10 @@ static int ni_valid_rtsi_output_source(struct comedi_device *dev,
case NI_RTSI_OUTPUT_G_SRC0:
case NI_RTSI_OUTPUT_G_GATE0:
case NI_RTSI_OUTPUT_RGOUT0:
- case NI_RTSI_OUTPUT_RTSI_BRD_0:
+ case NI_RTSI_OUTPUT_RTSI_BRD(0):
+ case NI_RTSI_OUTPUT_RTSI_BRD(1):
+ case NI_RTSI_OUTPUT_RTSI_BRD(2):
+ case NI_RTSI_OUTPUT_RTSI_BRD(3):
return 1;
case NI_RTSI_OUTPUT_RTSI_OSC:
return (devpriv->is_m_series) ? 1 : 0;
@@ -5005,11 +5008,18 @@ static int ni_set_rtsi_routing(struct comedi_device *dev,
devpriv->rtsi_trig_a_output_reg |= NISTC_RTSI_TRIG(chan, src);
ni_stc_writew(dev, devpriv->rtsi_trig_a_output_reg,
NISTC_RTSI_TRIGA_OUT_REG);
- } else if (chan < 8) {
+ } else if (chan < NISTC_RTSI_TRIG_NUM_CHAN(devpriv->is_m_series)) {
devpriv->rtsi_trig_b_output_reg &= ~NISTC_RTSI_TRIG_MASK(chan);
devpriv->rtsi_trig_b_output_reg |= NISTC_RTSI_TRIG(chan, src);
ni_stc_writew(dev, devpriv->rtsi_trig_b_output_reg,
NISTC_RTSI_TRIGB_OUT_REG);
+ } else if (chan != NISTC_RTSI_TRIG_OLD_CLK_CHAN) {
+ /* probably should never reach this, since the
+ * ni_valid_rtsi_output_source above errors out if chan is too
+ * high
+ */
+ dev_err(dev->class_dev, "%s: unknown rtsi channel\n", __func__);
+ return -EINVAL;
}
return 2;
}
@@ -5025,12 +5035,12 @@ static unsigned int ni_get_rtsi_routing(struct comedi_device *dev,
} else if (chan < NISTC_RTSI_TRIG_NUM_CHAN(devpriv->is_m_series)) {
return NISTC_RTSI_TRIG_TO_SRC(chan,
devpriv->rtsi_trig_b_output_reg);
- } else {
- if (chan == NISTC_RTSI_TRIG_OLD_CLK_CHAN)
- return NI_RTSI_OUTPUT_RTSI_OSC;
- dev_err(dev->class_dev, "bug! should never get here?\n");
- return 0;
+ } else if (chan == NISTC_RTSI_TRIG_OLD_CLK_CHAN) {
+ return NI_RTSI_OUTPUT_RTSI_OSC;
}
+
+ dev_err(dev->class_dev, "%s: unknown rtsi channel\n", __func__);
+ return -EINVAL;
}

static int ni_rtsi_insn_config(struct comedi_device *dev,
--
2.20.1


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