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usb: usb_dc_native_posix: Fix buffer and max data 0 case

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When both buffer and max data to read are zero return
the available data in buffer.

Fixes #20838

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
This commit is contained in:
Andrei Emeltchenko 2019-11-21 10:58:06 +02:00 • committed by Anas Nashif
commit 1d81c0cf31
1 changed files with 13 additions and 0 deletions
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13
drivers/usb/device/usb_dc_native_posix.c
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@ -401,6 +401,19 @@ int usb_dc_ep_read_wait(u8_t ep, u8_t *data, u32_t max_data_len,
return -EINVAL;
}
if (!data && !max_data_len) {
/* When both buffer and max data to read are zero return
* the available data in buffer
*/
if (read_bytes) {
u8_t ep_idx = USBIP_EP_ADDR2IDX(ep);
*read_bytes = usbip_ctrl.out_ep_ctrl[ep_idx].data_len;
}
return 0;
}
LOG_DBG("ep %x max_data_len %u", ep, max_data_len);
bytes = usbip_recv(data, max_data_len);