On Wed 02 Sep 15:46 PDT 2015, Stephen Boyd wrote:
> Usage of VLAIS prevents clang from compiling this file, and it
> also opens us to the possibility of allocating a large structure
> on the stack to the point that we blow past the limit of the
> kernel stack. Remove the VLAIS and allocate a structure on the
> heap with kmalloc so that we're safer and more clang friendly.
>
[..]
> diff --git a/drivers/soc/qcom/smd-rpm.c b/drivers/soc/qcom/smd-rpm.c
[..]
> struct {
> struct qcom_rpm_header hdr;
> struct qcom_rpm_request req;
> - u8 payload[count];
> - } pkt;
> + u8 payload[];
> + } *pkt;
> + size_t size = sizeof(*pkt) + count;
>
[..]
>
> - ret = qcom_smd_send(rpm->rpm_channel, &pkt, sizeof(pkt));
> + ret = qcom_smd_send(rpm->rpm_channel, pkt, sizeof(*pkt));
It would be good if we actually include the request in the packet and
not just the headers :)
s/sizeof(*pkt)/size/
Sorry for not spotting this before, made my device not boot now that it
showed up in linux-next. And oddly the 8974 RPM seems to just ack the
messages, without any indication of the request being truncated...
@Andy, I presume this is only on your -next, can you update the commit?
Or do you want a patch for it?
With this tiny change what we have on next-20150921 seems to work fine.
Regards,
Bjorn
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