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HID: rmi: do not fetch more than 16 bytes in a query

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A firmware bug is present on the XPS Haswell edition which silently
split the request in two responses when the caller ask for a read of
more than 16 bytes.
The FW sends the first 16 then the 4 next, but it says that it answered
the 20 bytes in the first report.

This occurs only on the retrieving of the min/max of X and Y of the F11
function.
We only use the first 10 bytes of the Ctrl register, so we can get only
those 10 bytes to prevent the bug from happening.

Resolves:
https://bugzilla.redhat.com/show_bug.cgi?id=1090161

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2014-04-24 18:26:38 -04:00 committed by Jiri Kosina
parent f15475c397
commit dcce583792
1 changed files with 8 additions and 3 deletions
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11
drivers/hid/hid-rmi.c
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@ -641,10 +641,15 @@ static int rmi_populate_f11(struct hid_device *hdev)
}
}
/* retrieve the ctrl registers */
ret = rmi_read_block(hdev, data->f11.control_base_addr, buf, 20);
/*
* retrieve the ctrl registers
* the ctrl register has a size of 20 but a fw bug split it into 16 + 4,
* and there is no way to know if the first 20 bytes are here or not.
* We use only the first 10 bytes, so get only them.
*/
ret = rmi_read_block(hdev, data->f11.control_base_addr, buf, 10);
if (ret) {
hid_err(hdev, "can not read ctrl block of size 20: %d.\n", ret);
hid_err(hdev, "can not read ctrl block of size 10: %d.\n", ret);
return ret;
}