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[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>
This commit is contained in:
Daniel Ritz 2005-09-09 13:03:25 -07:00 committed by Linus Torvalds
parent c181e0e00f
commit c8751e4c0b
1 changed files with 6 additions and 0 deletions
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6
drivers/pcmcia/yenta_socket.c
View File

@ -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); debug("%p %04x %08x\n", socket, reg, val);
writel(val, socket->base + reg); 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) 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); debug("%p %04x %02x\n", socket, reg, val);
writeb(val, socket->base + 0x800 + reg); 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) 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); debug("%p %04x %04x\n", socket, reg, val);
writeb(val, socket->base + 0x800 + reg); writeb(val, socket->base + 0x800 + reg);
writeb(val >> 8, socket->base + 0x800 + reg + 1); writeb(val >> 8, socket->base + 0x800 + reg + 1);
/* PCI write posting... */
readb(socket->base + 0x800 + reg);
readb(socket->base + 0x800 + reg + 1);
} }
/* /*