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uml: DEBUG_SHIRQ fixes

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DEBUG_SHIRQ generates spurious interrupts, triggering handlers such as
mconsole_interrupt() or line_interrupt().  They expect data to be available to
be read from their sockets/pipes, but in the case of spurious interrupts, the
host didn't actually send anything, so UML hangs in read() and friends.
Setting those fd's as O_NONBLOCK makes DEBUG_SHIRQ-enabled UML kernels boot
and run correctly.

Signed-off-by: Eduard-Gabriel Munteanu <maxdamage@aladin.ro>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eduard-Gabriel Munteanu 2007-07-15 23:38:51 -07:00 committed by Linus Torvalds
parent e18eecb8b3
commit 89df6bfc04
4 changed files with 23 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
arch/um/drivers/chan_user.c
View file

@ -170,6 +170,12 @@ static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out)
err = -EINVAL;
goto out_close;
}
if (os_set_fd_block(*fd_out, 0)) {
printk("winch_tramp: failed to set thread_fd non-blocking.\n");
goto out_close;
}
return err;
out_close:

5
arch/um/drivers/mconsole_user.c
View file

@ -86,8 +86,9 @@ int mconsole_get_request(int fd, struct mc_request *req)
int len;
req->originlen = sizeof(req->origin);
req->len = recvfrom(fd, &req->request, sizeof(req->request), 0,
(struct sockaddr *) req->origin, &req->originlen);
req->len = recvfrom(fd, &req->request, sizeof(req->request),
MSG_DONTWAIT, (struct sockaddr *) req->origin,
&req->originlen);
if (req->len < 0)
return 0;

6
arch/um/drivers/ubd_user.c
View file

@ -43,6 +43,12 @@ int start_io_thread(unsigned long sp, int *fd_out)
kernel_fd = fds[0];
*fd_out = fds[1];
err = os_set_fd_block(*fd_out, 0);
if (err) {
printk("start_io_thread - failed to set nonblocking I/O.\n");
goto out_close;
}
pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM | SIGCHLD,
NULL);
if(pid < 0){

7
arch/um/drivers/xterm.c
View file

@ -151,6 +151,13 @@ int xterm_open(int input, int output, int primary, void *d,
goto out;
}
err = os_set_fd_block(new, 0);
if (err) {
printk("xterm_open : failed to set xterm descriptor "
"non-blocking, err = %d\n", -err);
goto out;
}
CATCH_EINTR(err = tcgetattr(new, &data->tt));
if(err){
new = err;