[xen stable-4.17] ns16550: fix an incorrect assignment to uart->io_size

[patchbot@xxxxxxx]

commit d0127881376baeea1e4eb71d0f7b56d942147124
Author:     Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
AuthorDate: Tue Feb 7 17:00:47 2023 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 7 17:00:47 2023 +0100

    ns16550: fix an incorrect assignment to uart->io_size
    
    uart->io_size represents the size in bytes. Thus, when serial_port.bit_width
    is assigned to it, it should be converted to size in bytes.
    
    Fixes: 17b516196c ("ns16550: add ACPI support for ARM only")
    Reported-by: Jan Beulich <jbeulich@xxxxxxxx>
    Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    master commit: 352c89f72ddb67b8d9d4e492203f8c77f85c8df1
    master date: 2023-01-24 16:54:38 +0100
---
 xen/drivers/char/ns16550.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index 01a05c9aa8..ce013fb6a5 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -1875,7 +1875,7 @@ static int __init ns16550_acpi_uart_init(const void *data)
     uart->parity = spcr->parity;
     uart->stop_bits = spcr->stop_bits;
     uart->io_base = spcr->serial_port.address;
-    uart->io_size = spcr->serial_port.bit_width;
+    uart->io_size = DIV_ROUND_UP(spcr->serial_port.bit_width, BITS_PER_BYTE);
     uart->reg_shift = spcr->serial_port.bit_offset;
     uart->reg_width = spcr->serial_port.access_width;
 
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