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Bugzilla: 1090161
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Upstream-status: sent https://patchwork.kernel.org/patch/4055781/
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From patchwork Thu Apr 24 22:26:38 2014
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: HID: rmi: do not fetch more than 16 bytes in a query
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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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X-Patchwork-Id: 4055781
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Message-Id: <1398378398-24825-1-git-send-email-benjamin.tissoires@redhat.com>
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To: Andrew Duggan <aduggan@synaptics.com>,
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Christopher Heiny <cheiny@synaptics.com>,
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Jiri Kosina <jkosina@suse.cz>, linux-input@vger.kernel.org,
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linux-kernel@vger.kernel.org
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Date: Thu, 24 Apr 2014 18:26:38 -0400
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A firmware bug is present on the XPS Haswell edition which silently
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split the request in two responses when the caller ask for a read of
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more than 16 bytes.
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The FW sends the first 16 then the 4 next, but it says that it answered
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the 20 bytes in the first report.
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This occurs only on the retrieving of the min/max of X and Y of the F11
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function.
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We only use the first 10 bytes of the Ctrl register, so we can get only
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those 10 bytes to prevent the bug from happening.
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Resolves:
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https://bugzilla.redhat.com/show_bug.cgi?id=1090161
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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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---
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drivers/hid/hid-rmi.c | 11 ++++++++---
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1 file changed, 8 insertions(+), 3 deletions(-)
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diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
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index 7da9509..cee89c9 100644
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--- a/drivers/hid/hid-rmi.c
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+++ b/drivers/hid/hid-rmi.c
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@@ -613,10 +613,15 @@ static int rmi_populate_f11(struct hid_device *hdev)
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}
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}
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- /* retrieve the ctrl registers */
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- ret = rmi_read_block(hdev, data->f11.control_base_addr, buf, 20);
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+ /*
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+ * retrieve the ctrl registers
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+ * the ctrl register has a size of 20 but a fw bug split it into 16 + 4,
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+ * and there is no way to know if the first 20 bytes are here or not.
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+ * We use only the first 10 bytes, so get only them.
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+ */
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+ ret = rmi_read_block(hdev, data->f11.control_base_addr, buf, 10);
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if (ret) {
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- hid_err(hdev, "can not read ctrl block of size 20: %d.\n", ret);
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+ hid_err(hdev, "can not read ctrl block of size 10: %d.\n", ret);
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return ret;
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}
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