PCI: dwc: Fix a 64bit bug in dw_pcie_ep_raise_msix_irq()

The "msg_addr" variable is u64.  However, the "aligned_offset" is an
unsigned int.  This means that when the code does:

  msg_addr &= ~aligned_offset;

it will unintentionally zero out the high 32 bits.  Use ALIGN_DOWN() to do
the alignment instead.

Fixes: 2217fff ("PCI: dwc: endpoint: Fix dw_pcie_ep_raise_msix_irq() alignment support")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Niklas Cassel <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Cc: <[email protected]>

Author: Dan Carpenter

drivers/pci/controller/dwc/pcie-designware-ep.c

@@ -6,6 +6,7 @@
  * Author: Kishon Vijay Abraham I <[email protected]>
  */
 
+#include <linux/align.h>
 #include <linux/bitfield.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
@@ -551,7 +552,7 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
 	}
 
 	aligned_offset = msg_addr & (epc->mem->window.page_size - 1);
-	msg_addr &= ~aligned_offset;
+	msg_addr = ALIGN_DOWN(msg_addr, epc->mem->window.page_size);
 	ret = dw_pcie_ep_map_addr(epc, func_no, 0, ep->msi_mem_phys, msg_addr,
 				  epc->mem->window.page_size);
 	if (ret)