[ 59/75] serial: PL011: move interrupt clearing

From: Greg KH
Date: Thu Apr 19 2012 - 17:08:04 EST


3.3-stable review patch. If anyone has any objections, please let me know.

------------------

From: Linus Walleij <linus.walleij@xxxxxxxxxx>

commit c3d8b76f61586714cdc5f219ba45592a54caaa55 upstream.

Commit 360f748b204275229f8398cb2f9f53955db1503b
"serial: PL011: clear pending interrupts"
attempts to clear interrupts by writing to a
yet-unassigned memory address. This fixes the issue.

The breaking patch is marked for stable so should be
carried along with the other patch.

Cc: Shreshtha Kumar Sahu <shreshthakumar.sahu@xxxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Nicolas Pitre <nico@xxxxxxxxxxx>
Reported-by: Viresh Kumar <viresh.kumar@xxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Tested-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/tty/serial/amba-pl011.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1930,10 +1930,6 @@ static int pl011_probe(struct amba_devic
goto unmap;
}

- /* Ensure interrupts from this UART are masked and cleared */
- writew(0, uap->port.membase + UART011_IMSC);
- writew(0xffff, uap->port.membase + UART011_ICR);
-
uap->vendor = vendor;
uap->lcrh_rx = vendor->lcrh_rx;
uap->lcrh_tx = vendor->lcrh_tx;
@@ -1951,6 +1947,10 @@ static int pl011_probe(struct amba_devic
uap->port.line = i;
pl011_dma_probe(uap);

+ /* Ensure interrupts from this UART are masked and cleared */
+ writew(0, uap->port.membase + UART011_IMSC);
+ writew(0xffff, uap->port.membase + UART011_ICR);
+
snprintf(uap->type, sizeof(uap->type), "PL011 rev%u", amba_rev(dev));

amba_ports[i] = uap;


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