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Red Hat Bugzilla – Attachment 304667 Details for
Bug 445054
8250 serial port lock recursion
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[patch]
RHEL4 fix for this issue
445054.patch (text/plain), 928 bytes, created by
Prarit Bhargava
on 2008-05-06 17:57:39 UTC
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Description:
RHEL4 fix for this issue
Filename:
MIME Type:
Creator:
Prarit Bhargava
Created:
2008-05-06 17:57:39 UTC
Size:
928 bytes
patch
obsolete
>This is a follow-up patch to Aris' patch posted on 09/13/2006, which was a >backport of the WAR > >http://marc.info/?l=linux-kernel&m=110751569018181&w=2 > >Backport the first part of the patch. Without this backport, a RHEL4 guest >will deadlock if more than 512 bytes of information is copied into the console >window. > >Tested (with help from clalance) successfully on Xen and tested successfully >on bare-metal. > >Resolves BZ 445054. > >diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c >index 88217dc..5b66ee7 100644 >--- a/drivers/serial/8250.c >+++ b/drivers/serial/8250.c >@@ -893,7 +893,9 @@ receive_chars(struct uart_8250_port *up, int *status, struct pt_regs *regs) > > do { > if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) { >+ spin_unlock(&up->port.lock); > tty->flip.work.func((void *)tty); >+ spin_lock(&up->port.lock); > if (tty->flip.count >= TTY_FLIPBUF_SIZE) > return; // if TTY_DONT_FLIP is set > }
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