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rpmsgdrv.c: add spinlock to protect rxqueue

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avoid race conditions when the rpmsg thread and network card thread
access the rxqueue simultaneously.

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
This commit is contained in:
zhanghongyu
2025-10-28 15:43:54 +08:00
committed by Xiang Xiao
parent ba4361ccd8
commit be74eec727
1 changed files with 17 additions and 2 deletions
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drivers/net/rpmsgdrv.c
+17 -2
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@@ -34,6 +34,7 @@
#include <nuttx/kmalloc.h>
#include <nuttx/kthread.h>
#include <nuttx/semaphore.h>
#include <nuttx/spinlock.h>
#include <nuttx/wqueue.h>
#include <nuttx/net/dns.h>
@@ -73,6 +74,7 @@ struct net_rpmsg_drv_s
{
char cpuname[RPMSG_NAME_SIZE];
netpkt_queue_t rxqueue; /* RX packet queue */
spinlock_t lock; /* Spinlock for protecting rxqueue */
FAR void *priv; /* Private data for upper layer */
net_rpmsg_drv_cb_t cb; /* IFUP/DOWN Callback function */
sem_t wait; /* Wait sem, used for preventing any
@@ -264,7 +266,14 @@ net_rpmsg_drv_receive(FAR struct netdev_lowerhalf_s *dev)
{
FAR struct net_rpmsg_drv_s *drv =
container_of(dev, struct net_rpmsg_drv_s, dev);
return netpkt_remove_queue(&drv->rxqueue);
FAR netpkt_t *pkt;
irqstate_t flags;
flags = spin_lock_irqsave(&drv->lock);
pkt = netpkt_remove_queue(&drv->rxqueue);
spin_unlock_irqrestore(&drv->lock, flags);
return pkt;
}
/* RPMSG related functions */
@@ -423,6 +432,8 @@ static int net_rpmsg_drv_transfer_handler(FAR struct rpmsg_endpoint *ept,
FAR struct net_rpmsg_drv_s *drv = priv;
FAR struct netdev_lowerhalf_s *dev = &drv->dev;
FAR netpkt_t *pkt;
irqstate_t flags;
int ret;
if (transfer->length > len - sizeof(*transfer))
{
@@ -446,7 +457,10 @@ static int net_rpmsg_drv_transfer_handler(FAR struct rpmsg_endpoint *ept,
goto free;
}
if (netpkt_tryadd_queue(pkt, &drv->rxqueue) < 0)
flags = spin_lock_irqsave(&drv->lock);
ret = netpkt_tryadd_queue(pkt, &drv->rxqueue);
spin_unlock_irqrestore(&drv->lock, flags);
if (ret < 0)
{
nerr("ERROR: Failed to add pkt to queue!\n");
goto free;
@@ -925,6 +939,7 @@ net_rpmsg_drv_alloc(FAR const char *devname, enum net_lltype_e lltype)
drv->ept.ns_bound_cb = net_rpmsg_drv_ns_bound;
nxsem_init(&drv->wait, 0, 0);
spin_lock_init(&drv->lock);
/* Init a random MAC address, the caller can override it. */