[PATCH v2] mt7601u: check chip version on probe

[PATCH v2] mt7601u: check chip version on probe

[Stanislaw Gruszka]

Since some USB device IDs are duplicated between mt7601u and mt76x0u
devices, check chip version on probe and return error if not match
0x7601.

Don't think this is serious issue, probe most likely will fail at
some other point for wrong device, but we do not have to configure
it if we know is not mt7601u device.

Reported-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
v2: return -ENODEV 
 
 drivers/net/wireless/mediatek/mt7601u/usb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt7601u/usb.c b/drivers/net/wireless/mediatek/mt7601u/usb.c
index d8b7863f7926..be3c794612b2 100644
--- a/drivers/net/wireless/mediatek/mt7601u/usb.c
+++ b/drivers/net/wireless/mediatek/mt7601u/usb.c
@@ -303,6 +303,10 @@ static int mt7601u_probe(struct usb_interface *usb_intf,
 	mac_rev = mt7601u_rr(dev, MT_MAC_CSR0);
 	dev_info(dev->dev, "ASIC revision: %08x MAC revision: %08x\n",
 		 asic_rev, mac_rev);
+	if ((asic_rev >> 16) != 0x7601) {
+		ret = -ENODEV;
+		goto err;
+	}
 
 	/* Note: vendor driver skips this check for MT7601U */
 	if (!(mt7601u_rr(dev, MT_EFUSE_CTRL) & MT_EFUSE_CTRL_SEL))
-- 
1.9.3

Re: [PATCH v2] mt7601u: check chip version on probe

[Jakub Kicinski]

On Thu,  7 Mar 2019 13:22:07 +0100, Stanislaw Gruszka wrote:
> Since some USB device IDs are duplicated between mt7601u and mt76x0u
> devices, check chip version on probe and return error if not match
> 0x7601.
> 
> Don't think this is serious issue, probe most likely will fail at
> some other point for wrong device, but we do not have to configure
> it if we know is not mt7601u device.
> 
> Reported-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
> Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>

Acked-by: Jakub Kicinski <kubakici@wp.pl>

Thanks!

Re: [PATCH v2] mt7601u: check chip version on probe

[Kalle Valo]

Stanislaw Gruszka <sgruszka@redhat.com> wrote:

> Since some USB device IDs are duplicated between mt7601u and mt76x0u
> devices, check chip version on probe and return error if not match
> 0x7601.
> 
> Don't think this is serious issue, probe most likely will fail at
> some other point for wrong device, but we do not have to configure
> it if we know is not mt7601u device.
> 
> Reported-by: Xose Vazquez Perez <xose.vazquez@gmail.com>
> Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
> Acked-by: Jakub Kicinski <kubakici@wp.pl>

Patch applied to wireless-drivers.git, thanks.

c0316470683a mt7601u: check chip version on probe

-- 
https://patchwork.kernel.org/patch/10842757/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches