[xen master] xen/arm: vpl011: Fix misleading comments

[patchbot@xxxxxxx]

commit 005e84e695ed086b9ebb281ee6711fd1aa6aaaba
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Wed Apr 5 13:17:48 2023 +0200
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Mon Apr 17 13:00:45 2023 -0700

    xen/arm: vpl011: Fix misleading comments
    
    In both vpl011_read_data() and vpl011_read_data_xen(), there is a comment
    stating that the guest is expected to read the DR register only if the
    TXFE bit of FR register is not set. This is obviously logically wrong and
    it should be RXFE (i.e. RX FIFO empty bit set -> nothing to read).
    
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Reviewed-by: Ayan Kumar Halder <ayan.kumar.halder@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Reviewed-by: Henry Wang <Henry.Wang@xxxxxxx>
---
 xen/arch/arm/vpl011.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/vpl011.c b/xen/arch/arm/vpl011.c
index 2fa80bc15a..0186d8a318 100644
--- a/xen/arch/arm/vpl011.c
+++ b/xen/arch/arm/vpl011.c
@@ -143,8 +143,8 @@ static uint8_t vpl011_read_data_xen(struct domain *d)
     /*
      * It is expected that there will be data in the ring buffer when this
      * function is called since the guest is expected to read the data register
-     * only if the TXFE flag is not set.
-     * If the guest still does read when TXFE bit is set then 0 will be 
returned.
+     * only if the RXFE flag is not set.
+     * If the guest still does read when RXFE bit is set then 0 will be 
returned.
      */
     if ( xencons_queued(in_prod, in_cons, sizeof(intf->in)) > 0 )
     {
@@ -202,8 +202,8 @@ static uint8_t vpl011_read_data(struct domain *d)
     /*
      * It is expected that there will be data in the ring buffer when this
      * function is called since the guest is expected to read the data register
-     * only if the TXFE flag is not set.
-     * If the guest still does read when TXFE bit is set then 0 will be 
returned.
+     * only if the RXFE flag is not set.
+     * If the guest still does read when RXFE bit is set then 0 will be 
returned.
      */
     if ( xencons_queued(in_prod, in_cons, sizeof(intf->in)) > 0 )
     {
--
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