From 4f65977df0b9a667fdcd85b95d457a220c94113f Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Sat, 1 Apr 2006 01:38:18 +0900 Subject: [PATCH] [PATCH] libata: make ata_set_mode() handle no-device case properly Make ata_set_mode() return without doing anything if there is no device on the port. This is in preparation for ata_bus_probe() changes. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/scsi/libata-core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index c10c550da38..913e378eca7 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -1823,7 +1823,7 @@ static void ata_host_set_dma(struct ata_port *ap) */ static void ata_set_mode(struct ata_port *ap) { - int i, rc, used_dma = 0; + int i, rc, used_dma = 0, found = 0; /* step 1: calculate xfer_mask */ for (i = 0; i < ATA_MAX_DEVICES; i++) { @@ -1842,9 +1842,12 @@ static void ata_set_mode(struct ata_port *ap) dev->pio_mode = ata_xfer_mask2mode(pio_mask); dev->dma_mode = ata_xfer_mask2mode(dma_mask); + found = 1; if (dev->dma_mode) used_dma = 1; } + if (!found) + return; /* step 2: always set host PIO timings */ rc = ata_host_set_pio(ap); -- 2.20.1