From bce3e6fe8ba7cc42d0111281f135204ce16e0d94 Mon Sep 17 00:00:00 2001
From: "Maciej W. Rozycki" <macro@orcam.me.uk>
Date: Fri, 23 Sep 2022 19:52:08 +0100
Subject: [PATCH] parport_pc: Avoid FIFO port location truncation
[ Upstream commit ab126f51c93a15093df604f661c9480854c005a3 ]
Match the data type of a temporary holding a reference to the FIFO port
with the type of the original reference coming from `struct parport',
avoiding data truncation with LP64 ports such as SPARC64 that refer to
PCI port I/O locations via their corresponding MMIO addresses and will
therefore have non-zero bits in the high 32-bit part of the reference.
And in any case it is cleaner to have the data types matching here.
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Link: https://lore.kernel.org/linux-pci/20220419033752.GA1101844@bhelgaas/
Acked-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2209231912550.29493@angie.orcam.me.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/parport/parport_pc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index eda4ded4d5e5..925be41eeebe 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -468,7 +468,7 @@ static size_t parport_pc_fifo_write_block_pio(struct parport *port,
const unsigned char *bufp = buf;
size_t left = length;
unsigned long expire = jiffies + port->physport->cad->timeout;
- const int fifo = FIFO(port);
+ const unsigned long fifo = FIFO(port);
int poll_for = 8; /* 80 usecs */
const struct parport_pc_private *priv = port->physport->private_data;
const int fifo_depth = priv->fifo_depth;