From: Daniel Ritz Date: Fri, 9 Sep 2005 20:03:25 +0000 (-0700) Subject: [PATCH] pcmcia/yenta: avoid PCI write posting problem X-Git-Tag: v2.6.14-rc1~380 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8751e4c0bd32ecb76434240a56a087fa223280c;p=linux-2.6 [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 Cc: Dominik Brodowski Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c index 271a52b7c2..f0997c36c9 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); } /*