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| author | Guido Kiener <guido@kiener-muenchen.de> | 2018-07-18 10:45:34 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-21 08:22:15 +0200 |
| commit | 4f3c8d6eddc272b386464524235440a418ed2029 (patch) | |
| tree | 2a6bcbd4f499ec765e710d9c0f8b18366b9181e8 /mm/percpu-stats.c | |
| parent | 04b453c859d3be8f3f992f929bfa2957db184e4b (diff) | |
usb: usbtmc: Support Read Status Byte with SRQ per file
Add 'struct usbtmc_file_data' for each file handle to cache last
srq_byte (=Status Byte with SRQ) received by usbtmc_interrupt(..)
usbtmc488_ioctl_read_stb returns cached srq_byte when available for
each file handle to avoid race conditions of concurrent applications.
SRQ now sets EPOLLPRI instead of EPOLLIN since EPOLLIN is now reserved
for asynchronous reads
Tested-by: Dave Penkler <dpenkler@gmail.com>
Reviewed-by: Steve Bayless <steve_bayless@keysight.com>
Signed-off-by: Guido Kiener <guido.kiener@rohde-schwarz.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/percpu-stats.c')
0 files changed, 0 insertions, 0 deletions