From: Daniel Ritz <daniel.ritz@gmx.ch>
extend cb_writel(), exca_writeb(), exca_writel() to do a read[lb]() after
the write[lb]() to avoid possible problem with PCI write posting.
Seems to fix Bug #5061.
Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
drivers/pcmcia/yenta_socket.c | 6 ++++++
1 files changed, 6 insertions(+)
diff -puN drivers/pcmcia/yenta_socket.c~pcmcia-yenta-avoid-pci-write-posting-problem drivers/pcmcia/yenta_socket.c
--- devel/drivers/pcmcia/yenta_socket.c~pcmcia-yenta-avoid-pci-write-posting-problem 2005-08-17 21:42:55.000000000 -0700
+++ devel-akpm/drivers/pcmcia/yenta_socket.c 2005-08-17 21:42:55.000000000 -0700
@@ -72,6 +72,7 @@ static inline void cb_writel(struct yent
{
debug("%p %04x %08x\n", socket, reg, val);
writel(val, socket->base + reg);
+ readl(socket->base + reg); /* avoid problems with PCI write posting */
}
static inline u8 config_readb(struct yenta_socket *socket, unsigned offset)
@@ -136,6 +137,7 @@ static inline void exca_writeb(struct ye
{
debug("%p %04x %02x\n", socket, reg, val);
writeb(val, socket->base + 0x800 + reg);
+ readb(socket->base + 0x800 + reg); /* PCI write posting... */
}
static void exca_writew(struct yenta_socket *socket, unsigned reg, u16 val)
@@ -143,6 +145,10 @@ static void exca_writew(struct yenta_soc
debug("%p %04x %04x\n", socket, reg, val);
writeb(val, socket->base + 0x800 + reg);
writeb(val >> 8, socket->base + 0x800 + reg + 1);
+
+ /* PCI write posting... */
+ readb(socket->base + 0x800 + reg);
+ readb(socket->base + 0x800 + reg + 1);
}
/*
_