diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0035-amba_pl011-Insert-mb-for-correct-FIFO-handling.patch')
-rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0035-amba_pl011-Insert-mb-for-correct-FIFO-handling.patch | 27 |
1 files changed, 0 insertions, 27 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0035-amba_pl011-Insert-mb-for-correct-FIFO-handling.patch b/target/linux/brcm2708/patches-4.19/950-0035-amba_pl011-Insert-mb-for-correct-FIFO-handling.patch deleted file mode 100644 index 30ac2a883c..0000000000 --- a/target/linux/brcm2708/patches-4.19/950-0035-amba_pl011-Insert-mb-for-correct-FIFO-handling.patch +++ /dev/null @@ -1,27 +0,0 @@ -From 76627df3e5f0513118dac20710766f97fc5ca32d Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.org> -Date: Fri, 29 Sep 2017 10:32:19 +0100 -Subject: [PATCH] amba_pl011: Insert mb() for correct FIFO handling - -The pl011 register accessor functions use the _relaxed versions of the -standard readl() and writel() functions, meaning that there are no -automatic memory barriers. When polling a FIFO status register to check -for fullness, it is necessary to ensure that any outstanding writes have -completed; otherwise the flags are effectively stale, making it possible -that the next write is to a full FIFO. - -Signed-off-by: Phil Elwell <phil@raspberrypi.org> ---- - drivers/tty/serial/amba-pl011.c | 1 + - 1 file changed, 1 insertion(+) - ---- a/drivers/tty/serial/amba-pl011.c -+++ b/drivers/tty/serial/amba-pl011.c -@@ -1383,6 +1383,7 @@ static bool pl011_tx_char(struct uart_am - return false; /* unable to transmit character */ - - pl011_write(c, uap, REG_DR); -+ mb(); - uap->port.icount.tx++; - - return true; |