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thunderbolt: Retry USB4 block read operation

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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>
This commit is contained in:
Mika Westerberg 2020-02-14 19:25:34 +02:00
parent 7e72846bb9
commit 6bfe33473e
1 changed files with 2 additions and 5 deletions
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7
drivers/thunderbolt/usb4.c
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@ -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--)
continue;
ret = -EIO;
}
if (ret != -ENODEV && retries--)
continue;
return ret;
}