From 9ac625a3986034d79938baf9604210280fae35fa Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Wed, 14 Nov 2007 17:00:23 -0800 Subject: [PATCH] uml: fix spurious IRQ testing The spurious IRQ testing in request_irq is mishandled in um_request_irq, which sets the incoming file descriptors non-blocking only after request_irq succeeds. This results in the spurious irq calling read on a blocking descriptor, and a hang. Fixed by reversing the O_NONBLOCK setting and the request_irq call. Signed-off-by: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/kernel/irq.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c index 70c2d625b070..ba11ccd6a8a3 100644 --- a/arch/um/kernel/irq.c +++ b/arch/um/kernel/irq.c @@ -347,14 +347,15 @@ int um_request_irq(unsigned int irq, int fd, int type, { int err; - err = request_irq(irq, handler, irqflags, devname, dev_id); - if (err) - return err; - - if (fd != -1) + if (fd != -1) { err = activate_fd(irq, fd, type, dev_id); - return err; + if (err) + return err; + } + + return request_irq(irq, handler, irqflags, devname, dev_id); } + EXPORT_SYMBOL(um_request_irq); EXPORT_SYMBOL(reactivate_fd); -- 2.39.2