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
Signed-off-by: Julian Bradfield <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
drivers/usb/serial/pl2303.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
96050b11f690878c19c1cd39970ab7325d91e18b
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index cf2213b..fb3b6b7 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -826,6 +826,7 @@ static void pl2303_update_line_status(st
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;
--
1.2.4
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