Willy Tarreau 93dc1774d2 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>		2017-09-18 16:06:00 +02:00
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arm-charlcd.c	auxdisplay: Move arm-charlcd.c to drivers/auxdisplay folder	2017-04-08 17:48:20 +02:00
cfag12864b.c
cfag12864bfb.c	framebuffer: Use fb_<level>	2013-10-29 12:53:07 +02:00
charlcd.c	auxdisplay: charlcd: properly restore atomic counter on error path	2017-09-18 16:06:00 +02:00
hd44780.c	auxdisplay: hd44780: Fix DT properties to include units of measurement	2017-04-08 17:48:19 +02:00
ht16k33.c	auxdisplay: ht16k33: use le16_to_cpup() to fetch LE16 data	2017-04-08 17:48:20 +02:00
img-ascii-lcd.c	auxdisplay: img-ascii-lcd: Fix module autoload	2017-04-08 17:48:20 +02:00
Kconfig	auxdisplay: Move arm-charlcd.c to drivers/auxdisplay folder	2017-04-08 17:48:20 +02:00
ks0108.c	auxdisplay: ks0108: initialize local parport variable	2015-08-14 17:27:17 -07:00
Makefile	auxdisplay: Move arm-charlcd.c to drivers/auxdisplay folder	2017-04-08 17:48:20 +02:00
panel.c	auxdisplay: charlcd: properly restore atomic counter on error path	2017-09-18 16:06:00 +02:00