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Posted to commits@nuttx.apache.org by xi...@apache.org on 2021/10/21 07:05:28 UTC
[incubator-nuttx] branch master updated: drivers/can: Fix
can_poll() POLLOUT calculation
This is an automated email from the ASF dual-hosted git repository.
xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git
The following commit(s) were added to refs/heads/master by this push:
new 0e2a3ec drivers/can: Fix can_poll() POLLOUT calculation
0e2a3ec is described below
commit 0e2a3ecdf8d3522f8621a2a474ec166d1f2ea0fc
Author: Kenneth Thompson <ke...@flyvoly.com>
AuthorDate: Wed Oct 20 19:55:54 2021 -0700
drivers/can: Fix can_poll() POLLOUT calculation
can_poll() would indicate that there is no space in the TX FIFO if there is
already one element in the FIFO.
---
drivers/can/can.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/can/can.c b/drivers/can/can.c
index 5d3f7c7..b10154a 100644
--- a/drivers/can/can.c
+++ b/drivers/can/can.c
@@ -1129,13 +1129,13 @@ static int can_poll(FAR struct file *filep, FAR struct pollfd *fds,
while (ret < 0);
dev->cd_ntxwaiters--;
- ndx = dev->cd_xmit.tx_head + 1;
+ ndx = dev->cd_xmit.tx_tail + 1;
if (ndx >= CONFIG_CAN_FIFOSIZE)
{
ndx = 0;
}
- if (ndx != dev->cd_xmit.tx_tail)
+ if (ndx != dev->cd_xmit.tx_head)
{
eventset |= fds->events & POLLOUT;
}