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author | Willy Tarreau <w@1wt.eu> | 2017-09-07 15:37:30 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-09-18 16:06:00 +0200 |
commit | 93dc1774d2a4c7a298d5cdf78cc8acdcb7b1428d (patch) | |
tree | 32e7bcd21dfd863d3005e730ded8f1123519faf7 /drivers/nvmem/core.c | |
parent | d53bebdf4d779497b29e1aad26e19cac1d446f42 (diff) | |
download | linux-93dc1774d2a4c7a298d5cdf78cc8acdcb7b1428d.tar.bz2 |
auxdisplay: charlcd: properly restore atomic counter on error path
Commit f4757af ("staging: panel: Fix single-open policy race condition")
introduced in 3.19-rc1 attempted to fix a race condition on the open, but
failed to properly do it and used to exit without restoring the semaphore.
This results in -EBUSY being returned after the first open error until
the module is reloaded or the system restarted (ie: consecutive to a
dual open resulting in -EBUSY or to a permission error).
[ Note for stable maintainers: the code moved from drivers/misc/panel.c
to drivers/auxdisplay/{charlcd,panel}.c during 4.12. The patch easily
applies there (modulo the renamed atomic counter) but I can provide a
tested backport if desired. ]
Fixes: f4757af85 # 3.19-rc1
Cc: stable@vger.kernel.org
Cc: Mariusz Gorski <marius.gorski@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem/core.c')
0 files changed, 0 insertions, 0 deletions