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| author | Wolfram Sang <w.sang@pengutronix.de> | 2010-06-15 12:34:22 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-06-30 08:16:06 -0700 |
| commit | 7b4a036722cfab2b3922685ad473fac35a55c3fa (patch) | |
| tree | 0f3bb015fce2f925c9fb4107dad82c3f6d0380ce /drivers/usb/otg | |
| parent | 2bb14cbf04ded4b9e394a6ba9e4f06b82fbac8b2 (diff) | |
| download | linux-7b4a036722cfab2b3922685ad473fac35a55c3fa.tar.bz2 | |
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 <w.sang@pengutronix.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Daniel Mack <daniel@caiaq.de>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/otg')
| -rw-r--r-- | drivers/usb/otg/ulpi.c | 17 |
1 files 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); |