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authorJiri Kosina <jkosina@suse.cz>2007-10-20 00:05:19 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-11-21 09:25:55 -0800
commit12a245310134c88936581be7be9d08afc847120f (patch)
tree40f4f0bf55cee8524c097c852073a2d0bb2852ca /drivers
parent9c560a68b8e6bbec2608cc4dac0b5c8028e0c255 (diff)
USB: usbserial - fix potential deadlock between write() and IRQ
patch acd2a847e7fee7df11817f67dba75a2802793e5d in mainline. USB: usbserial - fix potential deadlock between write() and IRQ usb_serial_generic_write() doesn't disable interrupts when taking port->lock, and could therefore deadlock with usb_serial_generic_read_bulk_callback() being called from interrupt, taking the same lock. Fix it. Signed-off-by: Jiri Kosina <jkosina@suse.cz> Acked-by: Larry Finger <larry.finger@lwfinger.net> Cc: Marcin Slusarz <marcin.slusarz@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/serial/generic.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 4f8282ad772..c36eb7928fb 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -190,14 +190,15 @@ int usb_serial_generic_write(struct usb_serial_port *port, const unsigned char *
/* only do something if we have a bulk out endpoint */
if (serial->num_bulk_out) {
- spin_lock_bh(&port->lock);
+ unsigned long flags;
+ spin_lock_irqsave(&port->lock, flags);
if (port->write_urb_busy) {
- spin_unlock_bh(&port->lock);
+ spin_unlock_irqrestore(&port->lock, flags);
dbg("%s - already writing", __FUNCTION__);
return 0;
}
port->write_urb_busy = 1;
- spin_unlock_bh(&port->lock);
+ spin_unlock_irqrestore(&port->lock, flags);
count = (count > port->bulk_out_size) ? port->bulk_out_size : count;