From: Shay Drory <shayd@xxxxxxxxxx>
Currently, polling a umad device will always works, even if the device
was disassociated. Hence, returning EPOLLERR if device was
disassociated.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Shay Drory <shayd@xxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
---
drivers/infiniband/core/user_mad.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c
index b671d4aede77..6681e9cf8a18 100644
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -653,10 +653,14 @@ static __poll_t ib_umad_poll(struct file *filp, struct poll_table_struct *wait)
/* we will always be able to post a MAD send */
__poll_t mask = EPOLLOUT | EPOLLWRNORM;
+ mutex_lock(&file->mutex);
poll_wait(filp, &file->recv_wait, wait);
if (!list_empty(&file->recv_list))
mask |= EPOLLIN | EPOLLRDNORM;
+ if (file->agents_dead)
+ mask = EPOLLERR;
+ mutex_unlock(&file->mutex);
return mask;
}
--
2.29.2
