Commit 6bfe3347 authored Feb 14, 2020 by Mika Westerberg

thunderbolt: Retry USB4 block read operation

Especially when accessing retimers over USB4 sideband operations the
possibility to get read errors seems to be higher so make the
usb4_do_read_data() retry a couple of times if it sees any other error
than -ENODEV (device is gone). We can only do this for read side because
it carries the offset as part of metadata (as opposed to writes).

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

parent 7e72846b

drivers/thunderbolt/usb4.c

+2 −5

Original line number	Diff line number	Diff line
		@@ -115,11 +115,8 @@ static int usb4_do_read_data(u16 address, void *buf, size_t size,

		ret = read_block(read_block_data, dwaddress, data, dwords);
		if (ret) {
		if (ret == -ETIMEDOUT) {
		if (retries--)
		if (ret != -ENODEV && retries--)
		continue;
		ret = -EIO;
		}
		return ret;
		}

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