From 7b4a036722cfab2b3922685ad473fac35a55c3fa Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Tue, 15 Jun 2010 12:34:22 +0200 Subject: [PATCH] USB: otg/ulpi: bail out on read errors otg_read may return errnos, so bail out correctly to prevent bogus ID-numbers. Signed-off-by: Wolfram Sang Cc: Sascha Hauer Acked-by: Daniel Mack Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/otg/ulpi.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/usb/otg/ulpi.c b/drivers/usb/otg/ulpi.c index b1b346932946..d331b222ad21 100644 --- a/drivers/usb/otg/ulpi.c +++ b/drivers/usb/otg/ulpi.c @@ -59,12 +59,17 @@ static int ulpi_set_flags(struct otg_transceiver *otg) static int ulpi_init(struct otg_transceiver *otg) { - int i, vid, pid; - - vid = (otg_io_read(otg, ULPI_VENDOR_ID_HIGH) << 8) | - otg_io_read(otg, ULPI_VENDOR_ID_LOW); - pid = (otg_io_read(otg, ULPI_PRODUCT_ID_HIGH) << 8) | - otg_io_read(otg, ULPI_PRODUCT_ID_LOW); + int i, vid, pid, ret; + u32 ulpi_id = 0; + + for (i = 0; i < 4; i++) { + ret = otg_io_read(otg, ULPI_PRODUCT_ID_HIGH - i); + if (ret < 0) + return ret; + ulpi_id = (ulpi_id << 8) | ret; + } + vid = ulpi_id & 0xffff; + pid = ulpi_id >> 16; pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid); -- 2.20.1