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Bluetooth: hidp: Fix assumptions on the return value of hidp_send_message 

hidp_send_message was changed to return non-zero values on success,
which some other bits did not expect. This caused spurious errors to be
propagated through the stack, breaking some drivers, such as hid-sony
for the Dualshock 4 in Bluetooth mode.

As pointed out by Dan Carpenter, hid-microsoft directly relied on that
assumption as well.

Fixes: 48d9cc9d85 ("Bluetooth: hidp: Let hidp_send_message return number of queued bytes")

Signed-off-by: Dan Elkouby <streetwalkermc@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Dan Elkouby 2019-09-06 14:06:44 +03:00 committed by Marcel Holtmann
parent d7ef0d1e39
commit 8bb3537095
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/hid/hid-microsoft.c
View File

@ -303,7 +303,7 @@ static void ms_ff_worker(struct work_struct *work)
r->magnitude[MAGNITUDE_WEAK] = ms->weak; /* right actuator */
ret = hid_hw_output_report(hdev, (__u8 *)r, sizeof(*r));
if (ret)
if (ret < 0)
hid_warn(hdev, "failed to send FF report\n");
}

4
net/bluetooth/hidp/core.c
View File

@ -267,7 +267,7 @@ static int hidp_get_raw_report(struct hid_device *hid,
set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
data[0] = report_number;
ret = hidp_send_ctrl_message(session, report_type, data, 1);
if (ret)
if (ret < 0)
goto err;
/* Wait for the return of the report. The returned report
@ -343,7 +343,7 @@ static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
data[0] = reportnum;
set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
ret = hidp_send_ctrl_message(session, report_type, data, count);
if (ret)
if (ret < 0)
goto err;
/* Wait for the ACK from the device. */