Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=43d46ab1cdeb12b8d072cfdf84956073a1fa8866
Commit: 43d46ab1cdeb12b8d072cfdf84956073a1fa8866
Parent: 6d83c067ebd11d375b34c53192c10826947e8568
Author: Maciej W. Rozycki <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 7 00:15:11 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 08:42:24 2008 -0800
dz: fix locking issues
The ->start_tx(), ->stop_tx() and ->stop_rx() backends are called with the
port's lock already taken. Remove locking from within them and wrap around
calls as necessary.
Signed-off-by: Maciej W. Rozycki <[EMAIL PROTECTED]>
Cc: Jiri Slaby <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
drivers/serial/dz.c | 23 ++++++++++++-----------
1 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/drivers/serial/dz.c b/drivers/serial/dz.c
index c2f8677..656c342 100644
--- a/drivers/serial/dz.c
+++ b/drivers/serial/dz.c
@@ -108,37 +108,28 @@ static void dz_stop_tx(struct uart_port *uport)
{
struct dz_port *dport = (struct dz_port *)uport;
unsigned short tmp, mask = 1 << dport->port.line;
- unsigned long flags;
- spin_lock_irqsave(&dport->port.lock, flags);
tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
tmp &= ~mask; /* clear the TX flag */
dz_out(dport, DZ_TCR, tmp);
- spin_unlock_irqrestore(&dport->port.lock, flags);
}
static void dz_start_tx(struct uart_port *uport)
{
struct dz_port *dport = (struct dz_port *)uport;
unsigned short tmp, mask = 1 << dport->port.line;
- unsigned long flags;
- spin_lock_irqsave(&dport->port.lock, flags);
tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
tmp |= mask; /* set the TX flag */
dz_out(dport, DZ_TCR, tmp);
- spin_unlock_irqrestore(&dport->port.lock, flags);
}
static void dz_stop_rx(struct uart_port *uport)
{
struct dz_port *dport = (struct dz_port *)uport;
- unsigned long flags;
- spin_lock_irqsave(&dport->port.lock, flags);
dport->cflag &= ~DZ_CREAD;
dz_out(dport, DZ_LPR, dport->cflag | dport->port.line);
- spin_unlock_irqrestore(&dport->port.lock, flags);
}
static void dz_enable_ms(struct uart_port *port)
@@ -268,7 +259,9 @@ static inline void dz_transmit_chars(struct dz_port
*dport_in)
}
/* If nothing to do or stopped or hardware stopped. */
if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
+ spin_lock(&dport->port.lock);
dz_stop_tx(&dport->port);
+ spin_unlock(&dport->port.lock);
return;
}
@@ -285,8 +278,11 @@ static inline void dz_transmit_chars(struct dz_port
*dport_in)
uart_write_wakeup(&dport->port);
/* Are we are done. */
- if (uart_circ_empty(xmit))
+ if (uart_circ_empty(xmit)) {
+ spin_lock(&dport->port.lock);
dz_stop_tx(&dport->port);
+ spin_unlock(&dport->port.lock);
+ }
}
/*
@@ -417,7 +413,12 @@ static int dz_startup(struct uart_port *uport)
*/
static void dz_shutdown(struct uart_port *uport)
{
- dz_stop_tx(uport);
+ struct dz_port *dport = (struct dz_port *)uport;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dport->port.lock, flags);
+ dz_stop_tx(&dport->port);
+ spin_unlock_irqrestore(&dport->port.lock, flags);
}
/*
-
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