forked from luck/tmp_suning_uos_patched
[PATCH] uml: mconsole fixes
* when we have stop/sysrq/go, we get pt_regs of whatever executes mc_work_proc(). Would be better to see what we had at the time of interrupt that got us stop. * stop/stop/stop..... will give stack overflow. Shouldn't allow stop from mconsole_stop(). * stop/stop/go leaves us inside mconsole_stop() with os_set_fd_block(req->originating_fd, 0); reactivate_fd(req->originating_fd, MCONSOLE_IRQ); just done by nested mconsole_stop(). Ditto. * once we'd seen stop, there's a period when INTR commands are executed out of order (as they should; we might have the things stuck badly enough to never reach mconsole_stop(), but still not badly enough to block mconsole_interrupt(); in that situation we _want_ things like "cad" to be executed immediately). Once we enter monsole_stop(), all INTR commands will be executed in order, mixed with PROC ones. We'd better let user see that such change of behaviour has happened. (Suggested by lennert). * stack footprint of monsole_interrupt() is an atrocity; AFAICS we can safely make struct mc_request req; static in function there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -79,7 +79,7 @@ static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
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/* long to avoid size mismatch warnings from gcc */
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long fd;
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struct mconsole_entry *new;
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struct mc_request req;
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static struct mc_request req; /* that's OK */
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fd = (long) dev_id;
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while (mconsole_get_request(fd, &req)){
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@ -91,6 +91,7 @@ static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
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mconsole_reply(&req, "Out of memory", 1, 0);
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else {
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new->request = req;
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new->request.regs = get_irq_regs()->regs;
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list_add(&new->list, &mc_requests);
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}
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}
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@ -314,9 +315,21 @@ void mconsole_stop(struct mc_request *req)
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{
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deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
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os_set_fd_block(req->originating_fd, 1);
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mconsole_reply(req, "", 0, 0);
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while(mconsole_get_request(req->originating_fd, req)){
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if(req->cmd->handler == mconsole_go) break;
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mconsole_reply(req, "stopped", 0, 0);
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while (mconsole_get_request(req->originating_fd, req)) {
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if (req->cmd->handler == mconsole_go)
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break;
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if (req->cmd->handler == mconsole_stop) {
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mconsole_reply(req, "Already stopped", 1, 0);
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continue;
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}
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if (req->cmd->handler == mconsole_sysrq) {
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struct pt_regs *old_regs;
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old_regs = set_irq_regs((struct pt_regs *)&req->regs);
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mconsole_sysrq(req);
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set_irq_regs(old_regs);
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continue;
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}
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(*req->cmd->handler)(req);
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}
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os_set_fd_block(req->originating_fd, 0);
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@ -673,9 +686,7 @@ static void with_console(struct mc_request *req, void (*proc)(void *),
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static void sysrq_proc(void *arg)
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{
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char *op = arg;
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struct pt_regs *old_regs = set_irq_regs(¤t->thread.regs);
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handle_sysrq(*op, NULL);
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set_irq_regs(old_regs);
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}
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void mconsole_sysrq(struct mc_request *req)
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@ -14,6 +14,7 @@
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#include <sys/un.h>
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#include <unistd.h>
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#include "user.h"
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#include "sysdep/ptrace.h"
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#include "mconsole.h"
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#include "umid.h"
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#include "user_util.h"
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@ -61,6 +61,7 @@ struct mc_request
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struct mconsole_request request;
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struct mconsole_command *cmd;
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union uml_pt_regs regs;
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};
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extern char mconsole_socket_name[];
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