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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
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5
arch/um/drivers/mconsole_user.c
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@@ -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;