Since commit da6e162d6a46 ("[media] rc-core: simplify sysfs code"), when
the IR protocol is set using the sysfs interface to the same set of
protocols that are already set, store_protocols() does not refresh the
scancode filter with the new protocol, even if it has already called the
change_protocol() callback successfully. This results in the filter
being disabled in the hardware and not re-enabled until the filter is
set again using sysfs.
Fix in store_protocols() by still re-applying the filter whenever the
change_protocol() driver callback succeeded.
The problem can be reproduced with the img-ir driver by setting a
filter, and then setting the protocol to the same protocol that is
already set:
$ echo nec > protocols
$ echo 0xffff > filter_mask
$ echo nec > protocols
After this, messages which don't match the filter were still being
received.
Fixes: da6e162d6a46 ("[media] rc-core: simplify sysfs code")
Reported-by: Sifan Naeem <sifan.naeem@xxxxxxxxxx>
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Cc: David Härdeman <david@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v3.17+
Cc: linux-media@xxxxxxxxxxxxxxx
---
Changes in v2:
- Move fix to store_protocols(). Still set filter again even if protocol
mask hasn't been changed as a result of the protocol change (Mauro).
---
drivers/media/rc/rc-main.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 8d3b74c5a717..fc369b033484 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1021,16 +1021,16 @@ static ssize_t store_protocols(struct device *device,
goto out;
}
- if (new_protocols == old_protocols) {
- rc = len;
- goto out;
+ if (new_protocols != old_protocols) {
+ *current_protocols = new_protocols;
+ IR_dprintk(1, "Protocols changed to 0x%llx\n",
+ (long long)new_protocols);
}
- *current_protocols = new_protocols;
- IR_dprintk(1, "Protocols changed to 0x%llx\n", (long long)new_protocols);
-
/*
- * If the protocol is changed the filter needs updating.
+ * If a protocol change was attempted the filter may need updating, even
+ * if the actual protocol mask hasn't changed (since the driver may have
+ * cleared the filter).
* Try setting the same filter with the new protocol (if any).
* Fall back to clearing the filter.
*/
--
2.0.4
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