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authorDaniel Ritz <daniel.ritz@gmx.ch>2005-09-09 13:03:25 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-09 13:57:47 -0700
commitc8751e4c0bd32ecb76434240a56a087fa223280c (patch)
tree7c51bd027a4e82ed374b1114890bd86f1e558367 /drivers/pcmcia
parentc181e0e00ff778623c7fda055fd404a06d2c7845 (diff)
downloadop-kernel-dev-c8751e4c0bd32ecb76434240a56a087fa223280c.zip
op-kernel-dev-c8751e4c0bd32ecb76434240a56a087fa223280c.tar.gz
[PATCH] pcmcia/yenta: avoid PCI write posting problem
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> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/pcmcia')
-rw-r--r--drivers/pcmcia/yenta_socket.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 271a52b..f0997c3 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -72,6 +72,7 @@ static inline void cb_writel(struct yenta_socket *socket, unsigned reg, u32 val)
{
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 yenta_socket *socket, unsigned reg, u8 val
{
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_socket *socket, unsigned reg, u16 val)
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);
}
/*
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