RDMA/rxe: Fix rxe_qp_cleanup()

rxe_qp_cleanup() can sleep so it must be run in thread context and not in atomic context. This patch avoids that the following bug is triggered: Kernel BUG at 00000000560033f3 [verbose debug info unavailable] BUG: sleeping function called from invalid context at net/core/sock.c:2761 in_atomic(): 1, irqs_disabled(): 0, pid: 7, name: ksoftirqd/0 INFO: lockdep is turned off. Preemption disabled at: [<00000000b6e69628>] __do_softirq+0x4e/0x540 CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.15.0-rc7-dbg+ #4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014 Call Trace: dump_stack+0x85/0xbf ___might_sleep+0x177/0x260 lock_sock_nested+0x1d/0x90 inet_shutdown+0x2e/0xd0 rxe_qp_cleanup+0x107/0x140 [rdma_rxe] rxe_elem_release+0x18/0x80 [rdma_rxe] rxe_requester+0x1cf/0x11b0 [rdma_rxe] rxe_do_task+0x78/0xf0 [rdma_rxe] tasklet_action+0x99/0x270 __do_softirq+0xc0/0x540 run_ksoftirqd+0x1c/0x70 smpboot_thread_fn+0x1be/0x270 kthread+0x117/0x130 ret_from_fork+0x24/0x30 Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Moni Shoua <monis@mellanox.com> Cc: stable@vger.kernel.org Signed-off-by: Doug Ledford <dledford@redhat.com>
anholt · Jan 18, 2018 · bb3ffb7 · bb3ffb7
1 parent 65567e4
commit bb3ffb7
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Showing 2 changed files with 13 additions and 2 deletions.
diff --git a/drivers/infiniband/sw/rxe/rxe_qp.c b/drivers/infiniband/sw/rxe/rxe_qp.c
@@ -824,9 +824,9 @@ void rxe_qp_destroy(struct rxe_qp *qp)
 }
 
 /* called when the last reference to the qp is dropped */
-void rxe_qp_cleanup(struct rxe_pool_entry *arg)
+static void rxe_qp_do_cleanup(struct work_struct *work)
 {
-	struct rxe_qp *qp = container_of(arg, typeof(*qp), pelem);
+	struct rxe_qp *qp = container_of(work, typeof(*qp), cleanup_work.work);
 
 	rxe_drop_all_mcast_groups(qp);
 
@@ -859,3 +859,11 @@ void rxe_qp_cleanup(struct rxe_pool_entry *arg)
 	kernel_sock_shutdown(qp->sk, SHUT_RDWR);
 	sock_release(qp->sk);
 }
+
+/* called when the last reference to the qp is dropped */
+void rxe_qp_cleanup(struct rxe_pool_entry *arg)
+{
+	struct rxe_qp *qp = container_of(arg, typeof(*qp), pelem);
+
+	execute_in_process_context(rxe_qp_do_cleanup, &qp->cleanup_work);
+}
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h
@@ -35,6 +35,7 @@
 #define RXE_VERBS_H
 
 #include <linux/interrupt.h>
+#include <linux/workqueue.h>
 #include <rdma/rdma_user_rxe.h>
 #include "rxe_pool.h"
 #include "rxe_task.h"
@@ -281,6 +282,8 @@ struct rxe_qp {
 	struct timer_list rnr_nak_timer;
 
 	spinlock_t		state_lock; /* guard requester and completer */
+
+	struct execute_work	cleanup_work;
 };
 
 enum rxe_mem_state {