RE: [PATCH net-next] r8152: support request_firmware for RTL8153

[Hayes Wang <hayeswang@realtek.com>]

Marek Szyprowski [mailto:m.szyprowski@samsung.com]
> Sent: Wednesday, October 23, 2019 5:17 PM
> Subject: Re: [PATCH net-next] r8152: support request_firmware for RTL8153
> 
> Hi Hayes,
> 
> On 16.10.2019 05:02, Hayes Wang wrote:
> > This patch supports loading additional firmware file through
> > request_firmware().
> >
> > A firmware file may include a header followed by several blocks
> > which have different types of firmware. Currently, the supported
> > types are RTL_FW_END, RTL_FW_PLA, and RTL_FW_USB.
> >
> > The firmware is used to fix some compatible or hardware issues. For
> > example, the device couldn't be found after rebooting several times.
> >
> > The supported chips are
> > 	RTL_VER_04 (rtl8153a-2.fw)
> > 	RTL_VER_05 (rtl8153a-3.fw)
> > 	RTL_VER_06 (rtl8153a-4.fw)
> > 	RTL_VER_09 (rtl8153b-2.fw)
> >
> > Signed-off-by: Hayes Wang <hayeswang@realtek.com>
> > Reviewed-by: Prashant Malani <pmalani@chromium.org>
> 
> This patch (which landed in linux-next last days) causes a following
> kernel oops on the ARM 32bit Exynos5422 SoC based Odroid XU4 board:

Please try the following patch.

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index d3c30ccc8577..283b35a76cf0 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -4000,8 +4000,8 @@ static void rtl8152_fw_mac_apply(struct r8152 *tp, struct fw_mac *mac)
 static void rtl8152_apply_firmware(struct r8152 *tp)
 {
 	struct rtl_fw *rtl_fw = &tp->rtl_fw;
-	const struct firmware *fw = rtl_fw->fw;
-	struct fw_header *fw_hdr = (struct fw_header *)fw->data;
+	const struct firmware *fw;
+	struct fw_header *fw_hdr;
 	struct fw_phy_patch_key *key;
 	u16 key_addr = 0;
 	int i;
@@ -4009,6 +4009,9 @@ static void rtl8152_apply_firmware(struct r8152 *tp)
 	if (IS_ERR_OR_NULL(rtl_fw->fw))
 		return;
 
+	fw = rtl_fw->fw;
+	fw_hdr = (struct fw_header *)fw->data;
+
 	if (rtl_fw->pre_fw)
 		rtl_fw->pre_fw(tp);

> > +static void rtl8152_apply_firmware(struct r8152 *tp)
> > +{
> > +	struct rtl_fw *rtl_fw = &tp->rtl_fw;
> > +	const struct firmware *fw = rtl_fw->fw;
> > +	struct fw_header *fw_hdr = (struct fw_header *)fw->data;
> > +	int i;
> > +
> > +	if (IS_ERR_OR_NULL(rtl_fw->fw))
> > +		return;
> > +
> > +	if (rtl_fw->pre_fw)
> > +		rtl_fw->pre_fw(tp);
> > +

Best Regards,
Hayes