From 9829ce2ff25c659ca29cd15ab773312ac4b6cfc6 Mon Sep 17 00:00:00 2001 From: Alexey Brodkin Date: Fri, 17 Nov 2017 16:26:30 +0300 Subject: [PATCH] usb: ehci: Fix accessors for big-endian platforms and descriptors Commit 9000eddbae0d ("drivers/usb/ehci: Use platform-specific accessors") broke USB 2.0 on big-endian platforms because for them writel/readl() does automatic conversion of BE data to LE. Proper implementation requires to use "raw" variant of these accessors which read/write data without messing with endianess. While at it replace cpu_to_be32() to be32_to_cpu() in readl() to keep sane semantics. Signed-off-by: Alexey Brodkin Cc: Marek Vasut Reported-by: Vladimir Boroda --- drivers/usb/host/ehci.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index 7c39becd24..18692b732e 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -101,11 +101,11 @@ struct usb_linux_config_descriptor { } __attribute__ ((packed)); #if defined CONFIG_EHCI_DESC_BIG_ENDIAN -#define ehci_readl(x) cpu_to_be32(readl(x)) -#define ehci_writel(a, b) writel(cpu_to_be32(b), a) +#define ehci_readl(x) be32_to_cpu(__raw_readl(x)) +#define ehci_writel(a, b) __raw_writel(cpu_to_be32(b), a) #else -#define ehci_readl(x) cpu_to_le32(readl(x)) -#define ehci_writel(a, b) writel(cpu_to_le32(b), a) +#define ehci_readl(x) readl(x) +#define ehci_writel(a, b) writel(b, a) #endif #if defined CONFIG_EHCI_MMIO_BIG_ENDIAN -- 2.39.5