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authorDan Elkouby <streetwalkermc@gmail.com>2019-09-06 14:06:44 +0300
committerMarcel Holtmann <marcel@holtmann.org>2019-09-06 15:55:40 +0200
commit8bb3537095f107ed55ad51f6241165b397aaafac (patch)
tree4d1ed7c09cb08e75f92b4efc2f83e6c75bf15acb
parentd7ef0d1e39685b38c97b30daa6de0d50df004839 (diff)
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: 48d9cc9d85dd ("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>
-rw-r--r--drivers/hid/hid-microsoft.c2
-rw-r--r--net/bluetooth/hidp/core.c4
2 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hid/hid-microsoft.c b/drivers/hid/hid-microsoft.c
index 8b3a922bdad3..2cf83856f2e4 100644
--- a/drivers/hid/hid-microsoft.c
+++ b/drivers/hid/hid-microsoft.c
@@ -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");
}
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 8d889969ae7e..bef84b95e2c4 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -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. */