diff options
| author | Eduard-Gabriel Munteanu <maxdamage@aladin.ro> | 2007-07-16 08:38:51 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 18:05:38 +0200 |
| commit | 89df6bfc04059716de2eb2fe529f05b3e124fafd (patch) | |
| tree | 5f28a79bc65549f48e153f18b1692d9cf462c628 /arch/um/drivers/mconsole_user.c | |
| parent | Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE (diff) | |
| download | linux-89df6bfc04059716de2eb2fe529f05b3e124fafd.tar.xz linux-89df6bfc04059716de2eb2fe529f05b3e124fafd.zip | |
uml: DEBUG_SHIRQ fixes
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>
Diffstat (limited to 'arch/um/drivers/mconsole_user.c')
| -rw-r--r-- | arch/um/drivers/mconsole_user.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c index 62e5ad63181a..f31e71546e52 100644 --- a/arch/um/drivers/mconsole_user.c +++ b/arch/um/drivers/mconsole_user.c @@ -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; |