[PATCH AUTOSEL 4.14 011/371] staging: comedi: ni_mio_common: protect register write overflow

[PATCH AUTOSEL 4.14 011/371] staging: comedi: ni_mio_common: protect register write overflow

[Sasha Levin]

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 36361bdf934a..2f82dcb1fd06 100644
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -4991,7 +4991,10 @@ 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;
@@ -5012,11 +5015,18 @@ 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;
 }
@@ -5032,12 +5042,12 @@ 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

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

[PATCH AUTOSEL 4.14 022/371] staging: bcm2835-camera: Abort probe if there is no camera

[Sasha Levin]

From: Stefan Wahren <stefan.wahren@i2se.com>

[ Upstream commit 7566f39dfdc11f8a97d5810c6e6295a88f97ef91 ]

Abort the probing of the camera driver in case there isn't a camera
actually connected to the Raspberry Pi. This solution also avoids a
NULL ptr dereference of mmal instance on driver unload.

Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../vc04_services/bcm2835-camera/bcm2835-camera.c        | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
index 377da037f31c..b521752d9aa0 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c
@@ -1849,6 +1849,12 @@ static int __init bm2835_mmal_init(void)
 	num_cameras = get_num_cameras(instance,
 				      resolutions,
 				      MAX_BCM2835_CAMERAS);
+
+	if (num_cameras < 1) {
+		ret = -ENODEV;
+		goto cleanup_mmal;
+	}
+
 	if (num_cameras > MAX_BCM2835_CAMERAS)
 		num_cameras = MAX_BCM2835_CAMERAS;
 
@@ -1948,6 +1954,9 @@ static int __init bm2835_mmal_init(void)
 	pr_info("%s: error %d while loading driver\n",
 		BM2835_MMAL_MODULE_NAME, ret);
 
+cleanup_mmal:
+	vchiq_mmal_finalise(instance);
+
 	return ret;
 }
 
-- 
2.20.1

_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel