The IPA driver remove callback, ipa_remove(), calls ipa_modem_stop()
if the setup stage of initialization is complete. If a concurrent
call to ipa_modem_start() or ipa_modem_stop() has begin but not
completed, ipa_modem_stop() can return an error (-EBUSY).
The next patch adds a driver shutdown callback, which will simply
call ipa_remove(). We really want our shutdown callback to clean
things up. So add a single retry to the ipa_modem_stop() call in
ipa_remove() after a short (millisecond) delay. This offers no
guarantee the shutdown will complete successfully, but we'll at
least try a little harder before giving up.
Signed-off-by: Alex Elder <el...@linaro.org>
---
drivers/net/ipa/ipa_main.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 3fb9c5d90b70e..9f4bd822ac625 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -864,6 +864,11 @@ static int ipa_remove(struct platform_device *pdev)
if (ipa->setup_complete) {
ret = ipa_modem_stop(ipa);
+ /* If starting or stopping is in progress, try once more */
+ if (ret == -EBUSY) {
+ usleep_range(USEC_PER_MSEC, 2 * USEC_PER_MSEC);
+ ret = ipa_modem_stop(ipa);
+ }
if (ret)
return ret;
--
2.20.1
