Commit bf4de6f2 authored Sep 09, 2005 by Daniel Ritz Committed by Linus Torvalds Sep 09, 2005

[PATCH] pcmcia/cs: fix possible missed wakeup



- thread_done should only be completed when the wait_queue is installed.

- all wake up conditions should be checked before schedule()

this fixes a hang of rmmod in the sequence modprobe yenta_socket; rmmod
yenta_socket as reported by Andreas Steinmetz.  w/o this rmmod yenta_socket
can hang on wait_for_completion() in pcmcia_unregister_socket()

Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Cc: Dominik Brodowski <linux@brodo.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent b3743fa4

drivers/pcmcia/cs.c

+5 −4

Original line number	Diff line number	Diff line
		@@ -654,9 +654,10 @@ static int pccardd(void *__skt)
		skt->thread = NULL;
		complete_and_exit(&skt->thread_done, 0);
		}
		complete(&skt->thread_done);

		add_wait_queue(&skt->thread_wait, &wait);
		complete(&skt->thread_done);

		for (;;) {
		unsigned long flags;
		unsigned int events;
		@@ -682,11 +683,11 @@ static int pccardd(void *__skt)
		continue;
		}

		schedule();
		try_to_freeze();

		if (!skt->thread)
		break;

		schedule();
		try_to_freeze();
		}
		remove_wait_queue(&skt->thread_wait, &wait);