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| author | Alexey Klimov <alexey.klimov@arm.com> | 2015-12-10 17:28:37 +0000 |
|---|---|---|
| committer | Jassi Brar <jaswinder.singh@linaro.org> | 2016-02-02 16:39:13 +0530 |
| commit | e9c8dc8ba96b165ae72daad3b1f27823c3aee628 (patch) | |
| tree | fa2a6b0a43b5c56c1faf09f1068acc5cbc0457b0 | |
| parent | 34229b277480f46c1e9a19f027f30b074512e68b (diff) | |
| download | linux-e9c8dc8ba96b165ae72daad3b1f27823c3aee628.tar.bz2 | |
mailbox: pcc: fix channel calculation in get_pcc_channel()
This patch fixes the calculation of pcc_chan for non-zero id.
After the compiler ignores the (unsigned long) cast the
pcc_mbox_channels pointer is type-cast and then the type-cast
offset is added which results in address outside of the range
leading to the kernel crashing.
We might add braces and make it:
pcc_chan = (struct mbox_chan *)
((unsigned long) pcc_mbox_channels +
(id * sizeof(*pcc_chan)));
but let's go with array approach here and use id as index.
Tested on Juno board.
Signed-off-by: Alexey Klimov <alexey.klimov@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
| -rw-r--r-- | drivers/mailbox/pcc.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c index 45d85aea9955..8f779a1ec99c 100644 --- a/drivers/mailbox/pcc.c +++ b/drivers/mailbox/pcc.c @@ -81,16 +81,10 @@ static struct mbox_controller pcc_mbox_ctrl = {}; */ static struct mbox_chan *get_pcc_channel(int id) { - struct mbox_chan *pcc_chan; - if (id < 0 || id > pcc_mbox_ctrl.num_chans) return ERR_PTR(-ENOENT); - pcc_chan = (struct mbox_chan *) - (unsigned long) pcc_mbox_channels + - (id * sizeof(*pcc_chan)); - - return pcc_chan; + return &pcc_mbox_channels[id]; } /** |