A while ago, I posted about TIOCMIWAIT not working with the PL2303
USB-serial adapter.
After a brief exchange with Greg, I tracked this to a missing wake-up
in the USB interrupt procedures. I got our systems staff to install
the enclosed very simple patch to our 2.6.12 kernels, and it all works
fine as expected. I guess this should also apply to the latest version
and go into the mainstream.
Apologies for the long delay in posting the result.
The routine being patched is pl2303_update_line_status
--- linux-2.6.12/drivers/usb/serial/pl2303.c.orig 2005-06-17
20:48:29.000000000 +0100
+++ linux-2.6.12/drivers/usb/serial/pl2303.c 2006-01-09 15:26:00.000000000
+0000
@@ -841,6 +841,7 @@
spin_lock_irqsave(&priv->lock, flags);
priv->line_status = data[status_idx];
spin_unlock_irqrestore(&priv->lock, flags);
+ wake_up_interruptible (&priv->delta_msr_wait);
exit:
return;
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