PCI/switchtec: Read all 64 bits of part_event_bitmap

commit 6acdf7e19b37cb3a9258603d0eab315079c19c5e upstream.

The part_event_bitmap register is 64 bits wide, so read it with ioread64()
instead of the 32-bit ioread32().

Fixes: 52eabba5bcdb ("switchtec: Add IOCTLs to the Switchtec driver")
Link: https://lore.kernel.org/r/20190910195833.3891-1-logang@deltatee.com
Reported-by: Doug Meyer <dmeyer@gigaio.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org	# v4.12+
Cc: Kelvin Cao <Kelvin.Cao@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index 72db2e0..5aaa4ce 100644 (file)
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -13,7 +13,7 @@
 #include <linux/uaccess.h>
 #include <linux/poll.h>
 #include <linux/wait.h>
-
+#include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/nospec.h>
 
 MODULE_DESCRIPTION("Microsemi Switchtec(tm) PCIe Management Driver");
@@ -633,7 +633,7 @@ static int ioctl_event_summary(struct switchtec_dev *stdev,
        u32 reg;
 
        s.global = ioread32(&stdev->mmio_sw_event->global_summary);
-       s.part_bitmap = ioread32(&stdev->mmio_sw_event->part_event_bitmap);
+       s.part_bitmap = readq(&stdev->mmio_sw_event->part_event_bitmap);
        s.local_part = ioread32(&stdev->mmio_part_cfg->part_event_summary);
 
        for (i = 0; i < stdev->partition_count; i++) {