Messages in this thread | | | Subject | Re: [PATCH 3/3] pinctrl: qcom: Don't allow protected pins to be requested | From | Timur Tabi <> | Date | Mon, 22 Jan 2018 07:55:39 -0600 |
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On 1/9/18 7:58 PM, Stephen Boyd wrote: > + ret = device_property_read_u16_array(pctrl->dev, "gpios", tmp, > + len); > + if (ret < 0) { > + dev_err(pctrl->dev, "could not read list of GPIOs\n"); > + kfree(tmp); > + return ret; > + }
Just FYI, I'm still going to have to parse "gpios" in my pinctrl-qdf2xxx.c driver, even though you're also parsing it here. That's because I need to make sure that the msm_pingroup array only contains "approve" addresses in its ctl_reg fields.
+ for (i = 0; i < avail_gpios; i++) { + unsigned int gpio = gpios[i]; + + groups[gpio].npins = 1; + snprintf(names[i], NAME_SIZE, "gpio%u", gpio); + pins[gpio].name = names[i]; + groups[gpio].name = names[i]; + + groups[gpio].ctl_reg = 0x10000 * gpio; ^^^^
I do this because I need to make sure that "unapproved" physical addresses are never store anywhere in groups[]. That way, it's impossible for the driver to cause an XPU violation -- the worst that can happen is a null pointer dereference.
-- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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