USB: serial: pl2303: account for deficits of clones #6689
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There are apparently incomplete clones of the HXD type chip in use. Those return -EPIPE on GET_LINE_REQUEST and BREAK_REQUEST. Avoid flooding the kernel log with those errors. Detect them during startup and then use the line_settings cache instead of GET_LINE_REQUEST. Signal missing break support via -ENOTTY. Signed-off-by: Jan Kiszka <[email protected]> [ johan: fix macro prefix, drop oom error message ] Signed-off-by: Johan Hovold <[email protected]>
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There are apparently incomplete clones of the HXD type chip in use. Those return -EPIPE on GET_LINE_REQUEST and BREAK_REQUEST. Avoid flooding the kernel log with those errors. Detect them during startup and then use the line_settings cache instead of GET_LINE_REQUEST. Signal missing break support via -ENOTTY.
[ johan: fix macro prefix, drop oom error message ]