On 9/17/2023 1:34 PM, Greg Kroah-Hartman wrote:
Cc: stable@vger.kernel.org
What commit id does this fix?
Hi Greg,
This fixes the initial patch that added the driver: 9f6ce4240a2bf456402c15c06768059e5973f28c
Reviewed-by: Maciej Żenczykowski maze@google.com Signed-off-by: Krishna Kurapati quic_kriskura@quicinc.com
drivers/usb/gadget/function/f_ncm.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/gadget/function/f_ncm.c b/drivers/usb/gadget/function/f_ncm.c index feccf4c8cc4f..f00f051438ec 100644 --- a/drivers/usb/gadget/function/f_ncm.c +++ b/drivers/usb/gadget/function/f_ncm.c @@ -1156,7 +1156,8 @@ static int ncm_unwrap_ntb(struct gether *port, struct sk_buff_head *list) { struct f_ncm *ncm = func_to_ncm(&port->func);
- __le16 *tmp = (void *) skb->data;
- unsigned char *ntb_ptr = (void *) skb->data;
Why persist with the extra ' ', didn't checkpatch complain about this?
And why the cast at all?
My bad. I ran the checkpatch and got the following result:
kriskura@hu-kriskura-hyd:/local/mnt/workspace/krishna/510/testncm/kernel$ ./scripts/checkpatch.pl --strict 0001-usb-gadget-ncm-Handle-decoding-of-multiple-NTB-s-in-.patch WARNING: Prefer a maximum 75 chars per line (possible unwrapped commit description?) #12: unwraps the obtained request data assuming only one NTB is present, we loose
CHECK: No space is necessary after a cast #34: FILE: drivers/usb/gadget/function/f_ncm.c:1159: + unsigned char *ntb_ptr = (void *) skb->data;
CHECK: No space is necessary after a cast #46: FILE: drivers/usb/gadget/function/f_ncm.c:1176: + tmp = (void *) ntb_ptr;
CHECK: No space is necessary after a cast #93: FILE: drivers/usb/gadget/function/f_ncm.c:1329: + ntb_ptr = (unsigned char *) (ntb_ptr + block_len);
total: 0 errors, 1 warnings, 3 checks, 67 lines checked
I ignored the checks and saw only that errors are 0. Seems like I missed fixing the commit text wrapping to 75 chars (On line 12 it has 76 chars). Will fix it up in v3.
As per the cast, I initially didn't add any cast and saw that the code was not able to parse the dwSignature of the NTH and decoding of all packets was failing. Only when I added the cast, was the function able to decode all packets properly.
- __le16 *tmp; unsigned index, index2; int ndp_index; unsigned dg_len, dg_len2;
@@ -1169,6 +1170,10 @@ static int ncm_unwrap_ntb(struct gether *port, const struct ndp_parser_opts *opts = ncm->parser_opts; unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0; int dgram_counter;
- int to_process = skb->len;
+parse_ntb:
- tmp = (void *) ntb_ptr;
Again, no blank space please.
And why the cast?
the second cast here was just to be in sync with the original code; __le16 *tmp = (void *) skb->data;
I didn't try removing this and running the test. Will check if the second one is required or if decoding is proper without it or not.
Regards, Krishna,