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usb: typec: ucsi: Fix role swapping

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commit eb5d7ff3cf upstream.

All attempts to swap the roles timed out because the
completion was done without releasing the port lock. Fixing
that by releasing the lock before starting to wait for the
completion.

Link: https://lore.kernel.org/linux-usb/037de7ac-e210-bdf5-ec7a-8c0c88a0be20@gmail.com/
Fixes: ad74b8649b ("usb: typec: ucsi: Preliminary support for alternate modes")
Cc: stable@vger.kernel.org
Reported-and-tested-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20220405134824.68067-3-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus
2022-04-05 16:48:24 +03:00
committed by Greg Kroah-Hartman
parent 06826eb063
commit fb1fe1a455
1 changed files with 13 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/usb/typec/ucsi/ucsi.c
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@@ -937,14 +937,18 @@ static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role)
if (ret < 0)
goto out_unlock;
mutex_unlock(&con->lock);
if (!wait_for_completion_timeout(&con->complete,
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
ret = -ETIMEDOUT;
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
return -ETIMEDOUT;
return 0;
out_unlock:
mutex_unlock(&con->lock);
return ret < 0 ? ret : 0;
return ret;
}
static int ucsi_pr_swap(struct typec_port *port, enum typec_role role)
@@ -975,11 +979,13 @@ static int ucsi_pr_swap(struct typec_port *port, enum typec_role role)
if (ret < 0)
goto out_unlock;
mutex_unlock(&con->lock);
if (!wait_for_completion_timeout(&con->complete,
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS))) {
ret = -ETIMEDOUT;
goto out_unlock;
}
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
return -ETIMEDOUT;
mutex_lock(&con->lock);
/* Something has gone wrong while swapping the role */
if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) !=