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authorJohan Hovold <johan@kernel.org>2021-04-08 16:16:00 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-04-09 17:08:27 +0300
commit729f7955cb987c5b7d7e54c87c5ad71c789934f7 (patch)
tree14383a574e37af8dfa25758201d3111cac7aafc5 /Documentation/Kconfig
parent3d28466e5f4f8110da44ebad6a3054ec3020cdc4 (diff)
downloadlinux-729f7955cb987c5b7d7e54c87c5ad71c789934f7.tar.xz
Revert "USB: cdc-acm: fix rounding error in TIOCSSERIAL"
This reverts commit b401f8c4f492cbf74f3f59c9141e5be3071071bb. The offending commit claimed that trying to set the values reported back by TIOCGSERIAL as a regular user could result in an -EPERM error when HZ is 250, but that was never the case. With HZ=250, the default 0.5 second value of close_delay is converted to 125 jiffies when set and is converted back to 50 centiseconds by TIOCGSERIAL as expected (not 12 cs as was claimed, even if that was the case before an earlier fix). Comparing the internal current and new jiffies values is just fine to determine if the value is about to change so drop the bogus workaround (which was also backported to stable). For completeness: With different default values for these parameters or with a HZ value not divisible by two, the lack of rounding when setting the default values in tty_port_init() could result in an -EPERM being returned, but this is hardly something we need to worry about. Cc: Anthony Mallet <anthony.mallet@laas.fr> Cc: stable@vger.kernel.org Acked-by: Oliver Neukum <oneukum@suse.com> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210408131602.27956-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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