From 439d75478f6981ff1b829d711bcce3603f5a9786 Mon Sep 17 00:00:00 2001 From: Will Newton Date: Sat, 13 Nov 2010 17:12:33 +0000 Subject: [PATCH 2/2] uml: Disable winch irq before freeing handler data. Disable the winch irq early to make sure we don't take an interrupt part way through the freeing of the handler data, resulting in a crash on shutdown: winch_interrupt : read failed, errno = 9 fd 13 is losing SIGWINCH support ------------[ cut here ]------------ WARNING: at lib/list_debug.c:48 list_del+0xc6/0x100() list_del corruption, next is LIST_POISON1 (00100100) 082578c8: [<081fd77f>] dump_stack+0x22/0x24 082578e0: [<0807a18a>] warn_slowpath_common+0x5a/0x80 08257908: [<0807a23e>] warn_slowpath_fmt+0x2e/0x30 08257920: [<08172196>] list_del+0xc6/0x100 08257940: [<08060244>] free_winch+0x14/0x80 08257958: [<080606fb>] winch_interrupt+0xdb/0xe0 08257978: [<080a65b5>] handle_IRQ_event+0x35/0xe0 08257998: [<080a8717>] handle_edge_irq+0xb7/0x170 082579bc: [<08059bc4>] do_IRQ+0x34/0x50 082579d4: [<08059e1b>] sigio_handler+0x5b/0x80 082579ec: [<0806a374>] sig_handler_common+0x44/0xb0 08257a68: [<0806a538>] sig_handler+0x38/0x50 08257a78: [<0806a77c>] handle_signal+0x5c/0xa0 08257a9c: [<0806be28>] hard_handler+0x18/0x20 08257aac: [<00c14400>] 0xc14400 Signed-off-by: Will Newton --- arch/um/drivers/line.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c index 5f12fef..050e4dd 100644 --- a/arch/um/drivers/line.c +++ b/arch/um/drivers/line.c @@ -727,6 +727,9 @@ struct winch { static void free_winch(struct winch *winch, int free_irq_ok) { + if (free_irq_ok) + free_irq(WINCH_IRQ, winch); + list_del(&winch->list); if (winch->pid != -1) @@ -735,8 +738,6 @@ static void free_winch(struct winch *winch, int free_irq_ok) os_close_file(winch->fd); if (winch->stack != 0) free_stack(winch->stack, 0); - if (free_irq_ok) - free_irq(WINCH_IRQ, winch); kfree(winch); } -- 1.7.0.4