3.11.10.5 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Martyn Welch <[email protected]> commit f0342e66b397947ed8c3eef8c37b5ca2d5b1bb50 upstream. In order to ensure the correct width cycles on the VME bus, the VME bridge drivers implement an algorithm to utilise the largest possible width reads and writes whilst maintaining natural alignment constraints. The algorithm currently looks at the start address rather than the current read/write address when determining whether a 16-bit width cycle is required to get to 32-bit alignment. This results in incorrect alignment, Reported-by: Jim Strouth <[email protected]> Tested-by: Jim Strouth <[email protected]> Signed-off-by: Martyn Welch <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Luis Henriques <[email protected]> --- drivers/vme/bridges/vme_ca91cx42.c | 4 ++-- drivers/vme/bridges/vme_tsi148.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/vme/bridges/vme_ca91cx42.c b/drivers/vme/bridges/vme_ca91cx42.c index 64bfea3..8ca1030 100644 --- a/drivers/vme/bridges/vme_ca91cx42.c +++ b/drivers/vme/bridges/vme_ca91cx42.c @@ -880,7 +880,7 @@ static ssize_t ca91cx42_master_read(struct vme_master_resource *image, if (done == count) goto out; } - if ((uintptr_t)addr & 0x2) { + if ((uintptr_t)(addr + done) & 0x2) { if ((count - done) < 2) { *(u8 *)(buf + done) = ioread8(addr + done); done += 1; @@ -934,7 +934,7 @@ static ssize_t ca91cx42_master_write(struct vme_master_resource *image, if (done == count) goto out; } - if ((uintptr_t)addr & 0x2) { + if ((uintptr_t)(addr + done) & 0x2) { if ((count - done) < 2) { iowrite8(*(u8 *)(buf + done), addr + done); done += 1; diff --git a/drivers/vme/bridges/vme_tsi148.c b/drivers/vme/bridges/vme_tsi148.c index 94c892f..732983f 100644 --- a/drivers/vme/bridges/vme_tsi148.c +++ b/drivers/vme/bridges/vme_tsi148.c @@ -1289,7 +1289,7 @@ static ssize_t tsi148_master_read(struct vme_master_resource *image, void *buf, if (done == count) goto out; } - if ((uintptr_t)addr & 0x2) { + if ((uintptr_t)(addr + done) & 0x2) { if ((count - done) < 2) { *(u8 *)(buf + done) = ioread8(addr + done); done += 1; @@ -1371,7 +1371,7 @@ static ssize_t tsi148_master_write(struct vme_master_resource *image, void *buf, if (done == count) goto out; } - if ((uintptr_t)addr & 0x2) { + if ((uintptr_t)(addr + done) & 0x2) { if ((count - done) < 2) { iowrite8(*(u8 *)(buf + done), addr + done); done += 1; -- 1.9.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
