[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Don't cause watch fire deadlock by unconditionally rewriting the sysrq node.
# HG changeset patch # User cl349@xxxxxxxxxxxxxxxxxxxx # Node ID 36c4d3bb29c83cc847a4880e5755dffce54dbc78 # Parent 3eea03342466e50e983ecb49436650b89c8509e5 Don't cause watch fire deadlock by unconditionally rewriting the sysrq node. Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> diff -r 3eea03342466 -r 36c4d3bb29c8 linux-2.6-xen-sparse/arch/xen/kernel/reboot.c --- a/linux-2.6-xen-sparse/arch/xen/kernel/reboot.c Tue Sep 13 21:00:13 2005 +++ b/linux-2.6-xen-sparse/arch/xen/kernel/reboot.c Tue Sep 13 21:24:03 2005 @@ -355,16 +355,26 @@ static void sysrq_handler(struct xenbus_watch *watch, const char *node) { char sysrq_key = '\0'; - + int err; + + again: + err = xenbus_transaction_start("control"); + if (err) + return; if (!xenbus_scanf("control", "sysrq", "%c", &sysrq_key)) { printk(KERN_ERR "Unable to read sysrq code in control/sysrq\n"); - return; - } - - xenbus_printf("control", "sysrq", "%c", '\0'); + xenbus_transaction_end(1); + return; + } + + if (sysrq_key != '\0') + xenbus_printf("control", "sysrq", "%c", '\0'); + + err = xenbus_transaction_end(0); + if (err == -ETIMEDOUT) + goto again; if (sysrq_key != '\0') { - #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) handle_sysrq(sysrq_key, NULL, NULL); #else _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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