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[XEN,v2,01/11] xen/ns16550: Remove unneeded truncation check in the DT init code

Message ID 20230117174358.15344-2-ayan.kumar.halder@amd.com (mailing list archive)
State Superseded
Headers show
Series Add support for 32 bit physical address | expand

Commit Message

Ayan Kumar Halder Jan. 17, 2023, 5:43 p.m. UTC 
In an earlier commit (7c1de0038895), "ns16550.io_size" was u32 and
"io_size" was u64. Thus, the ASSERT() was needed to check if the values
are the same.
However, in a later commit (c9f8e0aee507), "ns16550.io_size" was changed
to u64. Thus, the ASSERT() became redundant.

So, now as "io_size" and "uart->io_size" are both u64, there will be no
truncation. Thus, one can remove the ASSERT() and extra assignment.

Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@amd.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---

Changes from :

v1 - 1. Updated commit message/title.
2. Added Rb.

 xen/drivers/char/ns16550.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)
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Patch

diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index 01a05c9aa8..58d0ccd889 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -1747,7 +1747,6 @@  static int __init ns16550_uart_dt_init(struct dt_device_node *dev,
     struct ns16550 *uart;
     int res;
     u32 reg_shift, reg_width;
-    u64 io_size;
 
     uart = &ns16550_com[0];
 
@@ -1758,14 +1757,10 @@  static int __init ns16550_uart_dt_init(struct dt_device_node *dev,
     uart->parity    = UART_PARITY_NONE;
     uart->stop_bits = 1;
 
-    res = dt_device_get_address(dev, 0, &uart->io_base, &io_size);
+    res = dt_device_get_address(dev, 0, &uart->io_base, &uart->io_size);
     if ( res )
         return res;
 
-    uart->io_size = io_size;
-
-    ASSERT(uart->io_size == io_size); /* Detect truncation */
-
     res = dt_property_read_u32(dev, "reg-shift", &reg_shift);
     if ( !res )
         uart->reg_shift = 0;