1 files changed, 19 insertions, 8 deletions

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index d08bd036ccb8..96f0189327af 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -56,7 +56,7 @@ static struct notifier_block reboot_notifier = {
 
 static LIST_HEAD(mc_requests);
 
-static void mc_work_proc(void *unused)
+static void mc_work_proc(struct work_struct *unused)
 {
         struct mconsole_entry *req;
         unsigned long flags;
@@ -72,14 +72,14 @@ static void mc_work_proc(void *unused)
         }
 }
 
-static DECLARE_WORK(mconsole_work, mc_work_proc, NULL);
+static DECLARE_WORK(mconsole_work, mc_work_proc);
 
 static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
 {
         /* long to avoid size mismatch warnings from gcc */
         long fd;
         struct mconsole_entry *new;
-        struct mc_request req;
+        static struct mc_request req;   /* that's OK */
 
         fd = (long) dev_id;
         while (mconsole_get_request(fd, &req)){
@@ -91,6 +91,7 @@ static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
                                 mconsole_reply(&req, "Out of memory", 1, 0);
                         else {
                                 new->request = req;
+                                new->request.regs = get_irq_regs()->regs;
                                 list_add(&new->list, &mc_requests);
                         }
                 }
@@ -314,9 +315,21 @@ void mconsole_stop(struct mc_request *req)
 {
         deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
         os_set_fd_block(req->originating_fd, 1);
-        mconsole_reply(req, "", 0, 0);
-        while(mconsole_get_request(req->originating_fd, req)){
-                if(req->cmd->handler == mconsole_go) break;
+        mconsole_reply(req, "stopped", 0, 0);
+        while (mconsole_get_request(req->originating_fd, req)) {
+                if (req->cmd->handler == mconsole_go)
+                        break;
+                if (req->cmd->handler == mconsole_stop) {
+                        mconsole_reply(req, "Already stopped", 1, 0);
+                        continue;
+                }
+                if (req->cmd->handler == mconsole_sysrq) {
+                        struct pt_regs *old_regs;
+                        old_regs = set_irq_regs((struct pt_regs *)&req->regs);
+                        mconsole_sysrq(req);
+                        set_irq_regs(old_regs);
+                        continue;
+                }
                 (*req->cmd->handler)(req);
         }
         os_set_fd_block(req->originating_fd, 0);
@@ -673,9 +686,7 @@ static void with_console(struct mc_request *req, void (*proc)(void *),
 static void sysrq_proc(void *arg)
 {
         char *op = arg;
-        struct pt_regs *old_regs = set_irq_regs(&current->thread.regs);
         handle_sysrq(*op, NULL);
-        set_irq_regs(old_regs);
 }
 
 void mconsole_sysrq(struct mc_request *req)