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kernel: fix channel locking and status update issues

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This commit is contained in:
max 🍓
2026-02-26 19:42:12 +00:00
parent eb8758bc5e
commit 2073cad97b
1 changed files with 29 additions and 5 deletions
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34
kernel/channel.c
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@@ -1,5 +1,6 @@
#include <kernel/channel.h>
#include <kernel/msg.h>
#include <kernel/port.h>
#include <kernel/util.h>
#include <kernel/vm-region.h>
@@ -80,6 +81,7 @@ static void kmsg_reply_error(
unsigned long *lock_flags)
{
msg->msg_status = KMSG_REPLY_SENT;
msg->msg_sender_port->p_status = PORT_READY;
msg->msg_result = status;
thread_awaken(msg->msg_sender_thread);
spin_unlock_irqrestore(&msg->msg_lock, *lock_flags);
@@ -95,6 +97,7 @@ static struct kmsg *get_next_msg(
spin_lock_irqsave(&msg->msg_lock, lock_flags);
if (msg->msg_status == KMSG_WAIT_RECEIVE) {
msg->msg_status = KMSG_WAIT_REPLY;
msg->msg_sender_port->p_status = PORT_REPLY_BLOCKED;
return msg;
}
@@ -149,17 +152,24 @@ extern kern_status_t channel_recv_msg(
struct task *sender = msg->msg_sender_thread->tr_parent;
struct task *receiver = self->tr_parent;
struct vm_region *src = sender->t_address_space,
*dst = receiver->t_address_space;
unsigned long f;
vm_region_lock_pair_irqsave(src, dst, &f);
kern_status_t status = vm_region_memmove_v(
receiver->t_address_space,
dst,
0,
out_msg->msg_data,
out_msg->msg_data_count,
sender->t_address_space,
src,
0,
msg->msg_req.msg_data,
msg->msg_req.msg_data_count,
VM_REGION_COPY_ALL,
NULL);
vm_region_unlock_pair_irqrestore(src, dst, f);
if (status != KERN_OK) {
kmsg_reply_error(msg, status, &msg_lock_flags);
return status;
@@ -208,17 +218,24 @@ extern kern_status_t channel_reply_msg(
/* the task that is about to send the response */
struct task *sender = self->tr_parent;
struct vm_region *src = sender->t_address_space,
*dst = receiver->t_address_space;
unsigned long f;
vm_region_lock_pair_irqsave(src, dst, &f);
kern_status_t status = vm_region_memmove_v(
receiver->t_address_space,
dst,
0,
msg->msg_resp.msg_data,
msg->msg_resp.msg_data_count,
sender->t_address_space,
src,
0,
resp->msg_data,
resp->msg_data_count,
VM_REGION_COPY_ALL,
NULL);
vm_region_unlock_pair_irqrestore(src, dst, f);
if (status != KERN_OK) {
kmsg_reply_error(msg, status, &msg_lock_flags);
return status;
@@ -262,17 +279,24 @@ extern kern_status_t channel_read_msg(
return KERN_INVALID_ARGUMENT;
}
struct vm_region *src_region
= msg->msg_sender_thread->tr_parent->t_address_space;
unsigned long f;
vm_region_lock_pair_irqsave(src_region, dest_region, &f);
kern_status_t status = vm_region_memmove_v(
dest_region,
0,
dest_iov,
dest_iov_count,
msg->msg_sender_thread->tr_parent->t_address_space,
src_region,
offset,
msg->msg_req.msg_data,
msg->msg_req.msg_data_count,
VM_REGION_COPY_ALL,
nr_read);
vm_region_unlock_pair_irqrestore(src_region, dest_region, f);
spin_unlock_irqrestore(&msg->msg_lock, msg_lock_flags);