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authorGuido Kiener <guido@kiener-muenchen.de>2018-09-12 04:51:03 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-20 07:04:02 -0400
commitdfee02ac4bce6374c9769fe31f20794309341fa0 (patch)
tree5f924c7ac748180382df93fcbd5e4c16f17e0e29 /tools/perf/scripts/python/export-to-postgresql.py
parentd7604ff0dc018f21d0363a8ebd424bf84cf41020 (diff)
usb: usbtmc: Fix ioctl USBTMC_IOCTL_CLEAR
Remove calculation of max_size (=wMaxPacketSize) and wrong condition (actual == max_size) in while loop. A device clear should always flush the complete Bulk-IN FIFO. Insert a sleep of 50 ms between subsequent CHECK_CLEAR_STATUS control requests to avoid stressing the instrument with repeated requests. Some instruments need time to cleanup internal I/O buffers. Polling and nonbraked requests slow down the response time of devices. Use USBTMC_BUFSIZE (4k) instead of USBTMC_SIZE_IOBUFFER (2k). Using USBTMC_SIZE_IOBUFFER is deprecated. Check only bit 0 (field bmClear) of the CHECK_CLEAR_STATUS response, since other bits are reserved and can change in future versions. Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com> Reviewed-by: Steve Bayless <steve_bayless@keysight.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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